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Operator
Good day, and welcome to the Chubb Limited First Quarter 2021 Earnings Call. Today's call is being recorded. (Operator Instructions)
For opening remarks and introductions, I'd like to turn the call over to Ms. Karen Beyer, Senior Vice President of Investor Relations. Please go ahead.
Karen L. Beyer - SVP of IR
Thank you. Welcome everyone, to our March 31, 2021, first quarter earnings conference call. Our report today will contain forward-looking statements, including statements relating to company performance, pricing and business mix, growth opportunities and economic and market conditions, which are subject to risks and uncertainties and actual results may differ materially. Please see our recent SEC filings, earnings release and financial supplement, which are available on our website at investors.chubb.com for more information on factors that could affect these matters.
We will also refer today to non-GAAP financial measures, reconciliations of which to the most direct comparable GAAP measures and related details are provided in our earnings press release and financial supplement.
Now I'd like to introduce our speakers. First, we have Evan Greenberg, Chairman and Chief Executive Officer; followed by Phil Bancroft, our Chief Financial Officer, and then we'll take your questions. Also with us to assist with your questions today are several members of our management team.
And now it's my pleasure to turn the call over to Evan.
Evan G. Greenberg - Executive Chairman & CEO
Good morning. We had a really good start to the year, highlighted by excellent premium revenue growth globally, powered by our commercial businesses, double-digit Commercial P&C rate increases and expanding underwriting margins, leading to record ex-CAT underwriting results and simply world-class margins. It was an active quarter for natural catastrophes, due primarily to the winter storm losses in Texas, though even with that, we produced a really good calendar year combined ratio, which speaks to our improved risk-adjusted underwriting returns.
The published P&C combined ratio was 91.8% and included catastrophe losses of 9.1 percentage points compared with 3.3% last year. The current accident year combined without CATs was 85.2% compared to 87.5% prior year. The 2.3 percentage point improvement was made up of a point of loss ratio with the balance related to the expense ratio.
Adjusted net investment income in the quarter was $930 million, up about 1.5%. That excludes private equity gains, which most other companies include. On that basis, investment income grew 50%. In sum, core operating income in the quarter of $2.52 per share was down $40 million from prior year to $1.1 billion while net income of $2.3 billion was up significantly over prior year's $252 million. Phil will have more to say about the expense ratio, CATs, prior period development, investment income and book value.
Turning to growth and the rate environment, P&C premiums were up 9.7% globally, with commercial premiums up 15.6% and consumer lines down 2.5%. Foreign exchange had a positive impact on growth of 1.6 points. The consumer lines result included negative growth in Global A&H, flat revenue in international personal lines and about 2.5% underlying growth in North America personal lines. We continue to experience a very strong Commercial P&C pricing environment globally, and based on what we see today, I'm confident these conditions will endure.
Chubb was built in all aspects over years to capitalize on these conditions. In North America, Commercial P&C premiums grew almost 15%. New business was up 21.7% and renewal retentions remained strong at 95% on a premium basis. In North America, Major Accounts & Specialty business, net premiums written grew about 17.5% or about 15%, excluding year-over-year impact of large structured transactions. Our middle market and small commercial business grew over 11%. Overall rate increased in North America Commercial were up by 14.5%, while loss costs are trending up about 5.5%, though it varies up or down depending upon line of business.
Let me give you a better sense of the rate environment. In Major Accounts, risk management - related primary casualty rates were up almost 8%. General casualty rates were up 34.5% and varied by category of casualty; property rates were up nearly 20%, and financial lines rates were up almost 21%.
In our E&S wholesale business, property was up 15.5%. Casualty and financial lines rates were up 25%. In our middle market business, rates for property were up 16%. Casualty was up 12%, excluding comp, with comp up 1%, and financial lines rates were up 18.5%.
In our International General Insurance operations, commercial premiums grew over 20% on a published basis or 15% in constant dollars. International retail commercial grew about 17.5%, and our London wholesale business grew 38.5%. Retail commercial growth varied by region, with premiums up over 26.5% in Asia Pacific, 22.5% in Europe, with equally strong growth in both the U.K. and on the Continent.
Our Latin America commercial lines business returned to growth in the quarter, with premiums up 4.7%. Internationally, like in the U.S., in those markets where we grew, we continued to achieve improved rate-to-exposure across our commercial portfolio. In Overseas General, rates were up about 14.5%, with a loss cost trend of 3%, though that varies by class of business and country. Rates were up 14% in our international retail business and 20% in our London wholesale business. Keep in mind, these outstanding commercial insurance growth rates in the U.S. and overseas were achieved in spite of the headwinds we faced from negative exposure growth due to reduced business activity.
On the other hand, consumer lines growth globally in the quarter continued to be impacted by the pandemic's effects on consumer-related activities. During the quarter, there were signs of recovery beginning. Breaking consumer down between A&H and personal lines, our international personal lines business produced modest growth of 1.2% on a published basis- fundamentally flat- in constant dollars. While our international A&H business shrank 3.7%.
Travel globally, both business and consumer-related remains depressed and that hits A&H hard, while our direct marketing and group employee benefits A&H business is beginning to pick up modestly. If we exclude the travel business, our international A&H business grew almost 2% on a published basis. We expect growth to continue to improve as the year goes along, although predicting the continued impact of the pandemic in Asia, Latin America and Europe is difficult.
Net premiums in our North America high net worth personal lines business were up about 2.5%, excluding reinsurance reinstatements, auto renewal credits in California and wildfire exposure-related cancellations. As I have said before, this outstanding franchise is about customers who choose Chubb for the service and richness of coverage and who are willing to pay for them. These client segments, which are at the heart of what we do, grew 8% in the quarter. Overall portfolio retention remained strong in high net worth at over 94% and we achieved positive pricing, which includes rate and exposure of 11% in our homeowners' portfolio.
Looking ahead, we have been and are taking continued actions to shape this portfolio. To that point, we're taking ongoing actions to reduce our wildfire exposure in parts of California as a consequence of our inability to achieve adequate rate and terms for the coverage. This will have an impact for the remainder of the year of about $50 million or about a 1.25% impact on our growth rate.
Lastly, in our Asia-focused international life insurance business, net premiums plus deposits were up over 18.5% in the quarter. In sum, as I have said the past few quarters or longer, we are in a hard or firming market for Commercial P&C in most of the world. The rate environment in my judgment is a rational and necessary response to years of industry underpricing and a more uncertain risk environment today driven by climate change, the litigation environment and cyber-related exposures.
Given our years of data and analytics capabilities and underwriting know-how, we know what rate we need in order to achieve an adequate risk-adjusted rate of return from underwriting and that is the objective and it is a relentless focus though we're never perfect. Some lines are there, others have a way to go. Virtually, all of our Commercial P&C lines of business continue to achieve rates that exceed loss cost and so margins continue to improve. As you can see, we're off to an outstanding start to the year. My colleagues and I are confident in our ability to grow our business and continue to expand margins.
And as I said, I expect as the year progresses, our sizable consumer business will return to growth. Our organization is focused and mission-driven. The quality of Chubb's service and consistency is a widely recognized differentiator. They are the well head of our reputation. We are leaning into the current favorable underwriting conditions and capitalizing wherever we can get paid adequately to assume risk and volatility. We are growing exposure. Our people are energized and focused, and we have all of the capabilities in place to grow our company profitably, while increasing shareholder value.
In light of recent events concerning The Hartford and for the sake of absolute clarity, I want to reiterate once again, our enduring views concerning M&A and capital management. We look at lots of deals every year, different sizes, small to large, different geographies and product areas and we pull the trigger infrequently. We have lots of optionality. We have made 17 acquisitions over the past 15 years and have an excellent track record of advancing the company's capabilities, while creating shareholder value.
Our approach is steady and consistent. We are extremely patient, disciplined and the money is not burning a hole in our pocket. If we believe a transaction will advance our strategy and further what we are building organically and is good for shareholders, we won't hesitate to pull the trigger.
As regards surplus capital, we're again very consistent. We hold capital for risk and growth, both organic and nonorganic. Beyond that, we return surplus capital to shareholders. We are highly confident about our future and wealth-creation prospects, and we approached The Hartford from that position of strength. This was another opportunity to create additional value and would not distract us from capitalizing on organic growth opportunity.
With that said, the purpose of today's call is to discuss our first quarter financials and our company's business. I'll now turn the call over to Phil, and then we're going to come back to take your questions.
Philip V. Bancroft - Executive VP & CFO
Thank you, Evan. Our financial position remains exceptionally strong. Our balance sheet includes a $121 billion AA-rated portfolio of cash and invested assets. We have over $74 billion in capital, stemming from our superior operating and investing performance. Our operating cash flow remains very strong and was $2.1 billion for the quarter.
Among the capital-related actions in the quarter, we returned $871 million to shareholders, including $352 million in dividends and $519 million in share repurchases. Adjusted pre-tax investment income for the quarter of $930 million was higher than our estimated range and benefited from increased corporate bond call activities. While there are a number of factors that impact the variability in investment income, we expect our quarterly run rate to be approximately $900 million.
Our annualized core operating ROE and core operating return on tangible equity were 8.2% and 12.8%, respectively, for the quarter. Separately, as Evan mentioned, we continue to present the fair value mark on our private equity funds outside of core operating income as realized gains and losses instead of net investment income as other companies do. The gain from the fair value mark this quarter would have added 3.1 percentage points to core operating ROE.
Book and tangible book value per share decreased by 0.4% and 0.6%, respectively, for the quarter, due to unrealized losses of $1.9 billion after tax in our investment portfolio from rising interest rates. This loss was tempered by adjusted realized gains of $1.2 billion after tax, mainly from the mark-to-market gains in private and public equities and in our variable annuity reinsurance portfolio.
At March 31, our investment portfolio remains in an unrealized gain position of $2.8 billion after tax. Our pre-tax P&C net catastrophe losses for the quarter were $700 million from severe weather-related events globally, including $657 million of losses from the storms in the U.S.
We had favorable prior period development in the quarter of $192 million pre-tax or $156 million after tax. The favorable development is split approximately 20% in long-tail lines, principally from accident years 2017 and prior and 80% in short-tail lines. There was no change to the previously reported aggregate P&C COVID-19 losses, the majority of which remains as incurred but not reported.
For the quarter, our net loss reserves increased $1.1 billion, and our paid-to-incurred ratio was 77%. The P&C administrative expense ratio of 8.6% in the quarter improved by 70 basis points over the prior year, about half related to onetime items that we don't expect to repeat. Our core operating effective tax rate was 15.5% for the quarter, which is within our expected range of 15% to 17% for the year.
I'll turn the call back over to Karen.
Karen L. Beyer - SVP of IR
Thank you, Phil. At this point, we're happy to take your questions.
Operator
(Operator Instructions) We'll go first to Michael Phillips with Morgan Stanley.
Michael Wayne Phillips - Equity Analyst
Congrats on the nice quarter, again, Evan. I appreciate it for the time here. I guess I want to focus first on -- you sound still very bullish on commercial lines and exposure growth that you want to push for. You said last quarter, commercial lines have legs. This quarter, you're confident that conditions will continue or endure?
I guess with your numbers that you gave on pricing and loss trends, there's still quite a bit of a gap there. That's good. A little bit narrow than what you said prior, but I guess, 2-part question is how adequate are current rates across the board? It's hard to imagine they're not. And then, I guess, you did say you want to push for exposure growth still. So is commercial lines still the place to push given what might be a narrowing gap in the rate versus loss trend?
Evan G. Greenberg - Executive Chairman & CEO
It's funny how people think about rate right now. And this obsession with our rate increases, decelerating the rate of increases, decelerating, accelerating, where is it? What are you trying to achieve? You're trying to achieve a risk-adjusted return, which translates to a combined ratio that is at least adequate to return a good risk-adjusted return. So let's call that 15% or it depends on the line of business, let's call it 15%. And as you approach that, as you achieve it, do you need to keep increasing rates? So you ask yourself that question. And you need rates to remain there, you got to achieve at least loss cost. We're achieving.
We have more and more of our portfolio, and it's proprietary. So I will not go into what percentages of the portfolio are at a proper risk-adjusted return in terms of combined ratios on a policy year and accident year basis, and we measure both. And with that, in total, look at the overall level of rate increase and look at the margin between the rate and exposure -- and loss cost trend.
Now with that, let me go a step further for you because of this obsession about this. When I look at the third and fourth quarter last year and I measure the first quarter against it right now, and I'm taking the time on this question because I know all of your colleagues or most of them have this question on their minds. When I look at the level of rate increase, this quarter measured against the prior. Okay. Property in North America, in aggregate, got rate increases in the mid-teens, which is about 2 to 3 points lower than it was in when I look at the average of the third and fourth quarter last year. Property has been getting rate on rate, rate on rate, rate on rate.
When I look at primary casualty, the rates are up. They're higher than they were on the average. When I look at excess and umbrella, the rate of increase is flat with the average of the quarters. When I look at financial lines, the rate of increase is flat with prior quarters. When I look at marine, it's up. When I look at aviation, it's flat to down. When I do this internationally, kind of the same trend, property down 2 to 3 points, the rate of increase from what it was the other 2 quarters. Primary casualty is flat. Excess and umbrella, the rate of increase is flat. Financial lines is up. And marine is down. So -- no, sorry, marine is up. And aviation is down a little bit.
So you know what, I think that gives you guys as much color as I can give you and to answer that question that -- from every angle I can that I know is on everyone's mind. You know what, the conditions are excellent. Thank you very much for the question, Mike.
Michael Wayne Phillips - Equity Analyst
Yes. That's helpful. Conditions are excellent. So that leads to this one. Frankly, I'm not even quite sure how to ask it, Evan, but I'm curious to hear what you can say. I'm not even asking about Hartford specifically at all. But just in general, I mean, clearly, there was some capital to be deployed there. And as you said, you have not burned a hole in your pocket. You're very infrequently -- pull the trigger infrequently. If something like that size is off the table and the conditions are still pretty right, I guess, how should we think about where to go from here for maybe another capital deployment round of authorization versus more organic? Or just kind of what can we expect for what was possible to be used there and how it might be used in the near term?
Evan G. Greenberg - Executive Chairman & CEO
What you can imagine, Michael, is steady as she goes. We have clear minds, and we're at rest. We upped our buybacks from $1.5 billion to $2.5 billion, and we will actively resume that. We had to take a pause during this episode with Hartford. And beyond that, steady as she goes. We got capital for risk and opportunity, and we are patient people.
Operator
We'll go next to Greg Peters with Raymond James.
Charles Gregory Peters - Equity Analyst
I don't want this to count as a question, but I believe, Phil, this is going to be your last earnings call, if I'm correct. Well, congratulations on your retirement.
Philip V. Bancroft - Executive VP & CFO
Well, thank you very much. It was, by the way, number 78.
Evan G. Greenberg - Executive Chairman & CEO
He's going over the wall, Greg.
Charles Gregory Peters - Equity Analyst
Number 78. Yes. I know you guys. I knew that would be an issue. So one of the areas that you've spent time in previous calls talking about is the expense ratio because it has showed improvement last year because of, in part, some COVID-related T&E savings and things like that. And then it still seems like it's on a general pathway of improvement.
So I was wondering perhaps if you can give us an updated view. When we look at these other companies that we follow, most of them try and map out of between a 40 to 70 basis point operational improvement in their expense ratio year-on-year out. I'm wondering if you can just give us an updated view on your expense ratio.
Evan G. Greenberg - Executive Chairman & CEO
Yes. Most of them are bloated. Look at our expense ratio in absolute terms versus others. Our operating expense ratio in North America is in the single digits and continuing to head marginally lower. And it will through efficiencies, which I have talked about numerous times that with technology and in all forms. So I won't go into it in great detail, but analytics, robotics, straight-through processing, et cetera. We are on track to continue to drive efficiencies in the operations.
And the same in Overseas General, the difference there is you're across 50-some-odd countries. And so by its nature, you have a different expense structure and it continues to improve. We're growing our P&C business, the commercial businesses, at a rate far in excess of growing operating expense, operating expenses up marginally, so we're leveraging against that. Both exposure and policy count is up, but you also got the added benefit, which drives the ratio down of simply price increase that feeds in there also.
It runs a lower acquisition cost then does the consumer lines business, but it runs a higher loss ratio. That's just axiomatic and true event. That business will continue to operate in the range that it's in that you see right now, up or down a couple of tenths of a percent in my mind as we look forward.
The consumer businesses will come back. And as they come back, they have a higher acquisition cost in the operating expense. So the internal expense ratio will go down because you will have more volume returning against it. But the acquisition ratio, which will remain steady within the line, it will become a greater mix of our total. And so that will go the other way. It's just natural. And -- but that business then runs a lower loss ratio. The margins are excellent, as you know. So maybe that gives you the color you're looking for.
Charles Gregory Peters - Equity Analyst
Indeed. And my follow-up question, yes -- boy, so many different areas I could go in, but I'm going to focus on operations. You said in your prepared remarks that loss cost trend was running around just above 5 points across the book. And then during your comments and in your response to the previous question, you talked about some really robust rate actions being taken across certain lines of business like general casualty, financial lines, things like that. Should I think about the loss cost trend in those lines is running higher because of the rate you're able to achieve? Or is that just an industry loss cost trend that you're able to get the rate you're getting?
Evan G. Greenberg - Executive Chairman & CEO
Let's see if I answer it this way for you. The marketplace in terms of rate is striving. The marketplace, because you operate within the marketplace, is striving for 2 things. And that is, you have those who have a hole to fill because they have deficiency in lines of business. Remember, the industry operates like a giant retro. And then they also need rate for adequacy today. That's the marketplace.
If you have operated at adequacy along the way, you don't have that first part that hole to fill. And achieving market rate, you're achieving better than adequate and that benefits you. We'll see. We're certainly in an active loss cost period when you remove the transient impact of COVID. And so we'll see how it all plays in terms of margin. We play things conservatively. But we are receiving rate that ensures the portfolio will achieve adequacy in terms of risk-adjusted rate of return across the book. And if we have more than that, well, that will just speak for itself over time. That's the best I can give you.
Operator
We'll go next to David Motemaden with Evercore ISI.
David Kenneth Motemaden - Research Analyst
Evan, I just wanted to follow up a little bit on the loss cost trend in North America commercial. It sounds like that's ticked up a bit to 5.5%, sounds like it's been ticking up. I guess it's obviously a minor detail given the amount of rate that you're getting and continuing to earn in above trend.
But wondering if you could just talk about what you're seeing that's driving that increase. I know there's a lot of moving pieces, mix and everything else. But just sort of wondering if maybe you can just elaborate on what was driving the increase in the loss trend.
Evan G. Greenberg - Executive Chairman & CEO
Yes. And my god, you're looking at about 0.5 point change. So let's just keep it in perspective. You have a couple of things. So in the short-tail lines, you have non-modeled cat loss that is on an accelerated trend. Everyone sees it. You know that. I'll move on from there. But that finds its way into -- if you're prudent and you're expected loss cost.
Secondly, on the casualty side, given the litigation environment and across different lines of business, you know we have watched and have talked about it endlessly that it is -- the loss cost environment there is not benign. And so as we always relentlessly study our trends across each class, we reflect it over a period of time in how we view loss cost and we react very quickly, particularly if there's any bad news. We react very slowly to good news. And so it's those 2 that are -- conspire between short and long tail.
David Kenneth Motemaden - Research Analyst
Got it. That's helpful. Was there anything in the quarter? Or I guess, some of the courts started to reopen. Was there anything specifically on the litigation environment that you saw during the quarter? Or it's just more a reflection?
Evan G. Greenberg - Executive Chairman & CEO
No. Not. David, no news in a quarter. We just do study that we look at -- we're looking at years past and trending forward. When you think about these things, they don't -- you don't react to -- loss cost trends aren't based upon news of this or that in any given quarter. They're based on a more stable period of time and a much bigger data set, obviously.
David Kenneth Motemaden - Research Analyst
Yes. Got it. That makes sense. And then I wanted to switch gears a little bit to the International Life business. Another good quarter, strong sales there, up 14% constant currency. I was hoping maybe you could dive into the different regions between Asia and Latin America and what's driving success there in each region. And maybe just stepping back a bit, just talk about the opportunity here. And if you think M&A is a lever that you're evaluating to maybe increase scale in any of these markets.
Evan G. Greenberg - Executive Chairman & CEO
So great question. The business is overwhelmingly Asia. Latin America, think predominantly Chile, and Banco de Chile and our partnership with them. And Chile is a great market, but Chile has truly been suffering from COVID and the lockdown. And while it's a very good business, it has some headwind in terms of growth related to that. But it's coming back and that'll continue to do very well. It's bank distribution, both branch and direct marketing related. It's more credit-related-type products and short term than it is long-term product, though there is a mix of that in the portfolio.
When you go to Asia, the growth is coming predominantly right now and in this quarter, Vietnam, Thailand, Hong Kong, Taiwan doing well. And our business in Korea getting better, but it's small and it will take a while to catch that up. What's not consolidated in those numbers, that we add as a line item because we don't have over 50% yet is the increase in Huatai, which is doing well.
And by the way, we are on our path. And it's at a very sensitive moment, so I don't want to talk about it much, but that will consolidate. I'm confident we'll finish what we got to get done to be able to consolidate Huatai. And that life business is growing well. So the organic growth, and those are agency-based businesses for the most part with some direct marketing as well, particularly in Thailand and bank distribution in Taiwan.
But if you look at Vietnam, Thailand, Hong Kong, China and those are predominantly -- those are agency businesses, where our agency force is growing. These are long-term products, guarantees are extremely low, like in the 1% to 2% range. And there's a healthy mix of savings and protection product. And that business is as you know we built it from dust predominantly and it's cast in a shadow. It's a few billion dollars now and I see great growth potential for that.
As regards M&A, I made the statement. When I came to the end of my commentary, I said we have lots of optionality. We have optionality when we're looking at opportunity, what that means is across product lines, across geographies, across customer segments and that includes the life insurance business. And if we found the right thing and it was accretive to our strategy and was good for shareholders, we wouldn't hesitate for a minute. Thanks for the question.
Operator
We'll go next to Elyse Greenspan with Wells Fargo.
Elyse Beth Greenspan - Director & Senior Analyst
My first question is tying together some of the comments we've heard throughout the call. Just in terms of market conditions, Evan, you still seem pretty positive there. And then as we think about the rest of this year, right, the economy continues to improve, so exposure growth should pick up. So as we think about your commercial businesses, both within the U.S. and internationally, given the dynamics of maybe some stabilization to slight deceleration in pricing, but that these...
Evan G. Greenberg - Executive Chairman & CEO
So what's the question, Elyse?
Elyse Beth Greenspan - Director & Senior Analyst
I guess the question is, I'm trying to understand, should we think about premium growth within commercial, should we think about that being stable relative to the Q1 and perhaps even improving as we get the economic improvement picking up from here?
Evan G. Greenberg - Executive Chairman & CEO
I don't -- there's nothing on the horizon that I see that tells me we're going to really decelerate in the commercial area. It varies by businesses as we look at it. But we're feeling very good about it.
Elyse Beth Greenspan - Director & Senior Analyst
Okay. That's helpful. Then my second question, Evan, as I was reading on your annual letter, you made mention of social inflation. I know throughout the call, we've kind of brought it up in terms of just what we're seeing today. But there's obviously issues that the industry is dealing with it that goes back to many, many decades. And I was just hoping to kind of get your updated view, kind of elaborate on what you mentioned in your annual report, if you guys think of about some of kind of the looming issues that the industry, yourselves and others are dealing with today.
Evan G. Greenberg - Executive Chairman & CEO
Yes. It's not a new issue to us. We've been on top of it for a while. The reviver statutes. They produce lots of notices. They then start to ripen, and you get facts and you're able to match them up against coverages that were in force at a period of time. And as they do, we recognize any live. We have been and continue to recognize liabilities that we have against those. And that is all baked into our published loss ratios that you see.
The reviver statutes have been open for a period of time. And so in most all jurisdictions, the reported notices of circumstances have decelerated tremendously from when they first open up. There are some states that are continuing to consider opening up reviver statutes in theirs. And so this is an event that the industry deals with over time. These things evolve over time.
I might add, we're very sympathetic to those and it breaks your heart where you see the circumstances of children abused by adults sexually and where they're for real. And then on the other side of the coin, the trial bar is a money-making machine. And that combined with new technologies of social media and litigation funding, they see it as another dog bowl to eat out of. And there is also a lot of suspect and specious behavior that is involved here. And our job is to tease out what's real and defend against anything that we suspect is just for ill-gotten gains.
Elyse Beth Greenspan - Director & Senior Analyst
That's helpful. And I also just want to extend my congrats on to Phil on his upcoming retirement.
Philip V. Bancroft - Executive VP & CFO
Thank you, Elyse.
Operator
We'll next go to Yaron Kinar with Goldman Sachs.
Yaron Joseph Kinar - Research Analyst
So I'm a bit obsessive in my nature. So I hope you can indulge another question on rates. I think you...
Evan G. Greenberg - Executive Chairman & CEO
I can say, it's not asking me to be redundant, Yaron. Don't ask me to do that. It will be -- ask me something new.
Yaron Joseph Kinar - Research Analyst
I'll try. So your submarket conditions hinder. I think that we are seeing more lines achieving rate adequacy, as you pointed out. We're in 30-year rate increases in excess of trends. Interest rates have increased. So why wouldn't Chubb specifically or the industry more broadly be willing to give up more rate for volume as we look at the year ahead?
Evan G. Greenberg - Executive Chairman & CEO
That doesn't make any sense to me at this point. Look at combined ratios of most, look at the loss environment. And I'll tell you what, I think the industry overall is not in a place where it has achieved adequate risk adjusted when you consider both things I talked about. And by the way, we are driving. I can't speak about the industry, but I'll tell you what. Chubb is growing -- just look at it. Chubb is growing exposure.
We're achieving rate, and we are growing a lot of business because it's at prices that we think are adequate to produce an adequate risk-adjusted return. Our new business was up over 20%, well, and our renewal retentions are high. We're growing. We're growing market share because the pricing is right. You're in a risk business, and pricing is -- and adequacy is where you just start. That's as good as I can give you, Yaron. Beyond that, you're overthinking it.
Yaron Joseph Kinar - Research Analyst
No. That's very helpful. And clearly, you guys are growing off of a very large base to begin with. So -- yes, no other questions on that front. I guess switching gears a little bit. We've heard some talk about potential tax reform. I realize these are very early days here. But can you maybe share your views on corporate tax reform, its potential impact on Chubb and Chubb's positioning?
Evan G. Greenberg - Executive Chairman & CEO
You know what, I don't know enough. And we have both the corporate tax rate that could go up. They're talking 21% going to 25% or 28%. We'll see how that plays. And then secondly, you've got GILTI and BEAT. And then you've got the notion of a minimum global tax rate, multilateral agreement with OECD.
All of these plates are spinning. The green book is not yet out that would tell us any detail of what's in the tax reform or the tax increase, tax or a reform proposal. And so we don't even know what the administration is yet proposing other than in headlines. And so we really can't speculate at this point. We just don't know. And when it comes out, we'll have a better sense. And then it's got to run the gauntlet in Congress. And we'll see from there. So I can't speculate at this point, Yaron.
Operator
We'll go next to Brian Meredith with UBS.
Brian Robert Meredith - MD, Financials Research Sector Head & Global Insurance Strategist
A couple of them here quickly for you, Evan. The first one, if I look at the rate activity that you've been generating in the last several quarters in North America commercial and then the 5.5% loss cost inflation, you do the math and you get a lot more underlying loss ratio improvement in your booking right now. Is that because of your just conservatism with respect to potential social inflation trends? Or is there something else that we're just not thinking about?
Evan G. Greenberg - Executive Chairman & CEO
Brian, I don't know what you're thinking about. I don't know what you guys are thinking about, but we have always operated the company conservatively, and I'm not going to -- I'm going to stop right there.
Brian Robert Meredith - MD, Financials Research Sector Head & Global Insurance Strategist
Okay. And then second question, I'm just curious if...
Evan G. Greenberg - Executive Chairman & CEO
I will say this to you, let's see. We produced over 2 points of margin improvement. It was an accident year combined ratio of 85.2%. My god, world-class.
Brian Robert Meredith - MD, Financials Research Sector Head & Global Insurance Strategist
No doubt. I completely agree. The second one, just sticking with North America commercial, written premium -- net written premium growth, really attractive in the quarter. Gross written premium growth also kind of increased. But clearly, you're seeing some benefits from just lower ceded premium. Any change in kind of the reinsurance strategy as we head into 2021?
Evan G. Greenberg - Executive Chairman & CEO
No, not a change of strategy. Not a change of strategy. It varies by line of business. There's mix within there. And then there is also within some lines of business, we have increased our net appetite. As we keep on more exposure, we have better spread of risk.
Operator
We'll go next to Ryan Tunis with Autonomous Research.
Ryan James Tunis - Partner of Property & Casualty Insurance
My question was just on sort of a language from the statement that you guys put out last week, just looking for some clarification. There's a comment where you said -- and this is involving The Hartford, "The path to your transaction would have been engagement coming from The Hartford on the terms of our last proposal." I guess my question is, is that just a general comment about your desire to do friendly M&A? Or are you trying to say something about that being your last proposal?
Evan G. Greenberg - Executive Chairman & CEO
Look, the chapter with The Hartford is closed. We have moved along. And beyond that, Ryan, I'm not going to now engage and talk about past events.
Ryan James Tunis - Partner of Property & Casualty Insurance
Understood. That's fair. But in terms of like thinking about M&A now, I guess, it's been 5 years since Chubb, back again, I think the big gating item was you didn't want to dilute tangible book value per share. I'm just trying to understand, as you think about M&A targets, has any of your thinking evolved in terms of what's most important financially? Is it earnings accretion? Is it still mainly or accretion or dilution to tangible book value per share?
Evan G. Greenberg - Executive Chairman & CEO
First of all, Ryan, with all due respect, your comment about tangible book is a nonsense comment. It was dilutive to begin with to tangible. And then it powered its way, way out of it.
Philip V. Bancroft - Executive VP & CFO
Almost 29%...
Evan G. Greenberg - Executive Chairman & CEO
So I don't know what -- how you're thinking about it. It's hard to do M&A that isn't dilutive to tangible. And then the question is, in the first moment, and then the question is, how accretive is it, and how quickly do you return? So with all due respect, I don't think you're thinking clearly.
Number two, let me make one -- I'm not going to go into Chubb's metrics of what's most important. That's not important here. And by the way, every deal has its own signature. And so you wanted to fit on a bumper sticker and it doesn't work that way. But I'm going to make one comment about M&A, today. EPS accretion, when you use a lot of cash, is a midget's lift. That's really easy. And I don't miss that one, whatsoever. None of us do. So that's the easiest metric. That's not what it's about when you measure wealth creation value. Thank you very much for the question.
Operator
We'll take our last question from Meyer Shields with KBW.
Meyer Shields - MD
Two really quick ones, I think. One, Evan, should we infer anything significant about reinsurance pricing from the fact that gross written premiums were down year-over-year?
Evan G. Greenberg - Executive Chairman & CEO
No.
Meyer Shields - MD
Okay. Second question, I was hoping you could comment on nontravel actions and health pricing.
Evan G. Greenberg - Executive Chairman & CEO
On accident and health pricing?
Meyer Shields - MD
Yes, please.
Evan G. Greenberg - Executive Chairman & CEO
Nontravel. Yes.Remember, we don't do a lot of health insurance. It's supplemental health and accident business. So it's fundamentally stable and actually up a few points. Rates have been moving up, particularly in the corporate travel area, the commercial business, and in our direct marketing business, it's very steady.
Operator
And at this time, there are no further questions.
Karen L. Beyer - SVP of IR
Thanks, everyone, for your time and attention this morning, and we look forward to speaking with you again next quarter. Have a great day.
Operator
This does conclude today's conference. We thank you for your participation.