Chubb Limited (CB) 10-Q 26 Apr 24 2024 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - SFr / shares	3 Months Ended
	Mar. 31, 2024	Apr. 19, 2024	Dec. 31, 2023
Document Type	10-Q
Document Period End Date	Mar. 31, 2024
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	CHUBB LIMITED
Entity Central Index Key	0000896159
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity File Number	1-11778
Entity Incorporation, State or Country Code	V8
Entity Tax Identification Number	98-0091805
Entity Address, Address Line One	Baerengasse 32
Entity Address, City or Town	Zurich
Entity Address, Country	CH
Entity Address, Postal Zip Code	8001
Country Region	41
City Area Code	(0)43
Local Phone Number	456 76 00
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Common Shares, par value	SFr 0.50		SFr 0.50
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Common Shares Outstanding		406,061,045
INA Senior Notes Due March 2038 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 2.50% Senior Notes due 2038
Trading Symbol	CB/38A
Security Exchange Name	NYSE
INA Senior Notes Due December 2029 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 0.875% Senior Notes due 2029
Trading Symbol	CB/29A
Security Exchange Name	NYSE
INA Senior Notes Due June 2031 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 1.40% Senior Notes due 2031
Trading Symbol	CB/31
Security Exchange Name	NYSE
INA Senior Notes Due March 2028 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 1.55% Senior Notes due 2028
Trading Symbol	CB/28
Security Exchange Name	NYSE
INA Senior Notes Due June 2027 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 0.875% Senior Notes due 2027
Trading Symbol	CB/27
Security Exchange Name	NYSE
INA Senior Notes Due December 2024 [Member]
Title of 12(b) Security	Guarantee of Chubb INA Holdings LLC 0.30% Senior Notes due 2024
Trading Symbol	CB/24A
Security Exchange Name	NYSE
Common Class A [Member]
Title of 12(b) Security	Common Shares, par value CHF 0.50 per share
Trading Symbol	CB
Security Exchange Name	NYSE

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Assets
Short-term investments, at fair value (amortized cost – $5,108 and $4,551) (includes variable interest entities (VIE) balances of $65 and $217)		$ 5,107	$ 4,551
Fixed maturities available-for-sale, at fair value, net of valuation allowance - $115 and $156 (amortized cost – $113,479 and $111,128)		108,289	106,571
Private debt held-for-investment, at amortized cost, net of valuation allowance - $5 and $4		2,708	2,553
Equity securities, at fair value (includes VIE balances of $1,163 and $1,078)		3,769	3,455
Private equities (includes VIE balances of $22 and $21)		14,281	14,078
Other investments (includes VIE balances of $4,408 and $3,773)		6,216	5,527
Total investments		140,370	136,735
Cash, including restricted cash $143 and $172 (includes VIE balances of $127 and $117)		2,651	2,621
Securities lending collateral		1,708	1,299
Accrued investment income		1,090	1,086
Insurance and reinsurance balances receivable, net of valuation allowance - $47 and $53		13,991	13,379
Reinsurance recoverable on losses and loss expenses, net of valuation allowance - $375 and $367	[1]	19,109	19,952
Reinsurance recoverable on policy benefits	[1]	272	280
Deferred policy acquisition costs		7,537	7,152
Value of business acquired		3,617	3,674
Goodwill		19,696	19,686
Other intangible assets		6,709	6,775
Deferred tax assets		1,761	1,741
Prepaid reinsurance premiums		3,241	3,221
Separate account assets		5,864	5,573
Other assets (includes VIE balances of $14 and $33)		7,251	7,508
Total assets		234,867	230,682
Liabilities
Unpaid losses and loss expenses		80,341	80,122
Unearned premiums		22,728	22,051
Future policy benefits		14,375	13,888
Market risk benefits		611	771
Policyholders' account balances		7,560	7,462
Separate account liabilities		5,864	5,573
Insurance and reinsurance balances payable		8,505	8,302
Securities lending payable		1,708	1,299
Accounts payable, accrued expenses, and other liabilities (includes VIE balances of $68 and $18)		8,357	8,332
Deferred tax liabilities		1,543	1,555
Repurchase agreements (includes VIE balances of $1,229 and $1,009)		3,022	2,833
Short-term debt		2,265	1,460
Long-term debt		13,248	13,035
Trust preferred securities		309	308
Total liabilities		170,436	166,991
Commitments and contingencies (refer to Note 12)
Shareholders’ equity
Common Shares (CHF 0.50 par value; 431,451,586 shares issued; 406,033,066 and 405,269,637 shares outstanding)		241	241
Common Shares in treasury (25,418,520 and 26,181,949 shares)		(4,461)	(4,400)
Additional paid-in capital		15,188	15,665
Retained earnings		56,953	54,810
Accumulated other comprehensive income (loss) (AOCI)		(7,386)	(6,809)
Total Chubb shareholders’ equity		60,535	59,507
Noncontrolling interests (includes VIE balances of $2,943 and $2,705)		3,896	4,184
Total shareholders' equity		64,431	63,691
Total liabilities and shareholders’ equity		$ 234,867	$ 230,682
[1] Net of valuation allowance for uncollectible reinsurance.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) (Unaudited) $ in Millions	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Statement of Financial Position [Abstract]
Short-term investments amortized cost	$ 5,108	$ 4,551
Fixed maturities, available-for-sale, valuation allowance	115	156
Fixed maturities, available-for-sale, at amortized cost	113,479	111,128
Private debt held-to-maturity, amortized cost	5	4
Restricted cash	143	172
Premium Receivable, Allowance for Credit Loss	47	53
Valuation allowance for uncollectible reinsurance	$ 375	$ 367
Common Shares, shares issued | shares	431,451,586	431,451,586
Common Shares, shares outstanding | shares	406,033,066	405,269,637
Treasury Stock, Common, Shares | shares	25,418,520	26,181,949
Short-term investments	$ 5,107	$ 4,551
Equity securities	3,769	3,455
Private equities	14,281	14,078
Other Investments	6,216	5,527
Cash, including restricted cash	2,651	2,621
Other Assets	7,251	7,508
Repurchase agreements	3,022	2,833
Noncontrolling interests	3,896	4,184
Variable Interest Entity, Primary Beneficiary
Short-term investments	65	217
Equity securities	1,163	1,078
Private equities	22	21
Other Investments	4,408	3,773
Cash, including restricted cash	127	117
Other Assets	14	33
Other liabilities	68	18
Repurchase agreements	1,229	1,009
Noncontrolling interests	$ 2,943	$ 2,705

Consolidated Statements Of Oper

Consolidated Statements Of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Net premiums written	$ 12,221	$ 10,710
Increase in unearned premiums	(638)	(568)
Net premiums earned	11,583	10,142
Net investment income	1,391	1,107
Net realized gains (losses)	(101)	(77)
Market risk benefits gains (losses)	21	(115)
Total revenues	12,894	11,057
Expenses
Losses and loss expenses	5,727	5,148
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	1,180	797
Policy acquisition costs	2,207	1,948
Administrative expenses	1,070	930
Interest expense	178	160
Other (income) expense	(191)	(296)
Amortization of purchased intangibles	80	72
Cigna integration expenses	7	22
Total expenses	10,258	8,781
Income before income tax	2,636	2,276
Income tax expense	342	384
Net Income	2,294	1,892
Net income attributable to noncontrolling interests	151	0
Net income attributable to Chubb	2,143	1,892
Other comprehensive income (loss):
Change in unrealized appreciation (depreciation)	(677)	1,786
Current discount rate on future policy benefits	(53)	(151)
Instrument-specific credit risk on market risk benefits	5	(3)
Cumulative foreign currency translation adjustment	80	(177)
Other, including postretirement benefit liability adjustment	31	(33)
Other comprehensive income (loss), before income tax	(614)	1,422
Income tax (expense) benefit related to OCI items	9	(132)
Other comprehensive income (loss)	(605)	1,290
Comprehensive income	1,689	3,182
Comprehensive income attributable to noncontrolling interests	123	0
Comprehensive income attributable to Chubb	$ 1,566	$ 3,182
Earnings per share
Basic earnings per share attributable to Chubb	$ 5.28	$ 4.57
Diluted earnings per share attributable to Chubb	$ 5.23	$ 4.53

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock, Common	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest
Noncontrolling interests							$ 0
Balance – beginning of period, net of tax at Dec. 31, 2022		$ 10,346	$ (5,113)	$ 7,166	$ 48,305	$ (10,185)
Noncontrolling Interest, Increase from Business Combination				0
Common Shares repurchased			(428)
Net shares issued under employee share-based compensation plans			200	(211)
Exercise of stock options				(13)
Share-based compensation expense				82
Funding of dividends declared to Retained earnings				(344)
Net income attributable to Chubb	$ 1,892				1,892
Funding of dividends declared from Additional paid-in capital					344
Dividends declared on Common Shares					(344)
Other Comprehensive Income (Loss), Net of Tax	1,290					1,290
Balance – end of period, net of tax at Mar. 31, 2023	52,987	10,346	(5,341)	6,680	50,197	(8,895)
Net income attributable to noncontrolling interests	0						0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							0
Noncontrolling interests							0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value							0
Total shareholders' equity	52,987
Noncontrolling interests	4,184						4,184
Total shareholders' equity	63,691
Balance – beginning of period, net of tax at Dec. 31, 2023	59,507	241	(4,400)	15,665	54,810	(6,809)
Noncontrolling Interest, Increase from Business Combination				(31)
Common Shares repurchased			(316)
Net shares issued under employee share-based compensation plans			255	(159)
Exercise of stock options				(19)
Share-based compensation expense				82
Funding of dividends declared to Retained earnings				(350)
Net income attributable to Chubb	2,143				2,143
Funding of dividends declared from Additional paid-in capital					350
Dividends declared on Common Shares					(350)
Other Comprehensive Income (Loss), Net of Tax	(605)					(577)
Balance – end of period, net of tax at Mar. 31, 2024	60,535	$ 241	$ (4,461)	$ 15,188	$ 56,953	$ (7,386)
Net income attributable to noncontrolling interests	151						151
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(28)
Noncontrolling interests	3,896						3,896
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value							$ (411)
Total shareholders' equity	$ 64,431

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 2,294	$ 1,892
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	101	77
Market risk benefits (gains) losses	(21)	115
Amortization of premiums/discounts on fixed maturities	(80)	(14)
Amortization of purchased intangibles	80	72
Equity in net income of partially-owned entities	(184)	(340)
Deferred income taxes	(24)	9
Unpaid losses and loss expenses	175	(14)
Unearned premiums	633	591
Future policy benefits	445	136
Insurance and reinsurance balances payable	155	(9)
Accounts payable, accrued expenses, and other liabilities	(267)	(390)
Income taxes	257	128
Insurance and reinsurance balances receivable	(586)	(402)
Reinsurance recoverable	852	622
Deferred policy acquisition costs	(390)	(254)
Net purchases of investments by consolidated investment products	(404)	0
Other	184	32
Net cash flows from operating activities	3,220	2,251
Cash flows from investing activities
Purchases of fixed maturities available-for-sale	(8,617)	(7,169)
Purchases of fixed maturities held-to-maturity	0	(88)
Purchases of equity securities	(752)	(135)
Sales of fixed maturities available-for-sale	4,368	3,854
Sales of equity securities	520	43
Maturities and redemptions of fixed maturities available-for-sale	2,149	1,541
Maturities and redemptions of fixed maturities held-to-maturity	0	472
Net change in short-term investments	(708)	1,256
Net derivative instruments settlements	(17)	(38)
Private equity contributions	(248)	(384)
Private equity distributions	177	273
Acquisition of subsidiaries	(236)	(23)
Other	(382)	(172)
Net cash flows used for investing activities	(3,746)	(570)
Cash flows from financing activities
Proceeds from issuance of long-term debt	996	0
Dividends paid on Common Shares	(349)	(345)
Common Shares repurchased	(404)	(545)
Proceeds from issuance of repurchase agreements	1,062	1,308
Repayment of long-term debt	0	475
Repayment of repurchase agreements	(984)	(1,307)
Proceeds from share-based compensation plans	163	55
Policyholder contract deposits	336	95
Policyholder contract withdrawals	(245)	(101)
Third-party capital invested into consolidated investment products	509	0
Third-party capital distributed by consolidated investment products	(413)	0
Other	(109)	(109)
Net cash flows from (used for) financing activities	562	(1,424)
Effect of foreign currency rate changes on cash and restricted cash	(6)	(2)
Net increase in cash and restricted cash	30	255
Cash and restricted cash - beginning of period	2,621	2,127
Cash and restricted cash - end of period	2,651	2,382
Supplemental cash flow information
Taxes paid	89	219
Interest paid	$ 112	$ 99

Consolidated Statements of Op_2

Consolidated Statements of Operations and Comprehensive Income (Parentheticals) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Liability for Future Policy Benefit, Remeasurement Gain (Loss)	$ (19)	$ 1

General and significant account

General and significant accounting policies	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General and significant accounting policies a) Basis of presentation Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Our results are reported through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Refer to Note 17 for additional information. The interim unaudited consolidated financial statements include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), over which Chubb exercises control, including Huatai Group, our majority-owned subsidiary, and minority-owned entities such as variable interest entities (VIEs) in which Chubb is considered the primary beneficiary. Noncontrolling interests on the Consolidated Financial Statements represent the portion of majority-owned subsidiaries and VIEs in which we do not have direct equity ownership. These interim unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and, in the opinion of management, reflect all adjustments necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated. On July 1, 2023, Chubb discontinued equity method accounting for its investment in Huatai Group upon obtaining a controlling interest and applied consolidation accounting. Therefore, effective July 1, 2023, business activity for, and the financial position of, Huatai Group is reported at 100 percent on the Consolidated Financial Statements. At March 31, 2024, and December 31, 2023, our aggregate ownership interest in Huatai Group was approximately 85.5 percent and 76.5 percent, respectively. The relevant amounts attributable to shareholders other than Chubb are reflected in the Consolidated Financial Statements under the captions Noncontrolling interests, Net income (loss) attributable to noncontrolling interests, and Comprehensive income (loss) attributable to noncontrolling interests. Refer to Note 2 for additional information on the acquisition of Huatai Group. Huatai Group's life insurance and asset management businesses are included in the Life Insurance segment, and Huatai Group's P&C business is included in the Overseas General Insurance segment. Results for Huatai Group's non-insurance operations, comprising real estate and holding company activity, are included in Corporate. The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2023 Form 10-K. b) Goodwill During the three months ended March 31, 2024, Goodwill increased $10 million, primarily reflecting the impact of foreign exchange. c) New Accounting Pronouncements Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (FASB) issued guidance that requires expanded reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the chief operating decision maker. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024. Retrospective application is required. We are currently evaluating the impact of this disclosure-only requirement. Improvements to Income Tax Disclosures In December 2023, the FASB issued guidance that requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the tax rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. We are currently evaluating the impact of this disclosure-only requirement.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2024
Business Combinations [Abstract]
Acquisitions	Acquisitions Huatai Group Huatai Insurance Group Co., Ltd. (Huatai Group) is a Chinese financial services holding company and the parent company of, among others, Huatai Property & Casualty Insurance Co., Ltd. (Huatai P&C), Huatai Life Insurance Co., Ltd. (Huatai Life), Huatai Asset Management Co., Ltd., and Huatai Baoxing Fund Management Co., Ltd., of which Huatai Group owns 100 percent, 80 percent, 91 percent, and 85 percent, respectively (collectively, Huatai). On July 1, 2023, Chubb increased ownership interest from approximately 64.2 percent to approximately 69.6 percent. At that time, Chubb discontinued the equity method of accounting and applied consolidation accounting. Refer to Note 2 to the Consolidated Financial Statements in our 2023 Form 10-K for additional information. In the first quarter of 2024, we closed on incremental ownership interests of approximately 9.0 percent for $555 million, $319 million of which was previously paid prior to 2024, and $236 million was paid in 2024. Our aggregate ownership interest in Huatai Group was approximately 85.5 percent as of March 31, 2024. Chubb has outstanding agreements for approximately 0.6 percent of incremental ownership interests, pending completion of certain closing conditions. We have paid deposits of $12 million related to these outstanding agreements, with approximately $24 million remaining to be paid upon closing, based on current exchange rates. The following table presents supplemental unaudited pro forma consolidated information for the periods indicated as though the acquisition of a controlling majority interest in Huatai Group that occurred on July 1, 2023, had instead occurred on January 1, 2022. The unaudited pro forma consolidated financial information is presented for informational purposes only and is not necessarily indicative of the operating results that would have occurred had the acquisition of a controlling majority interest been consummated on January 1, 2022, nor is it necessarily indicative of future operating results. Significant assumptions used to determine pro forma operating results include amortization of VOBA and other intangible assets. Three Months Ended Pro forma: March 31 (in millions of U.S. dollars) 2023 Net premiums earned $ 10,553 Total revenues $ 11,529 Net income $ 1,900 Net income attributable to Chubb $ 1,890

Investments

Investments	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Investments	Investments a) Fixed maturities March 31, 2024 Amortized Valuation Allowance Gross Gross Fair Value (in millions of U.S. dollars) Available-for-sale U.S. Treasury / Agency $ 3,058 $ — $ 5 $ (164) $ 2,899 Non-U.S. 36,962 (41) 605 (1,381) 36,145 Corporate and asset-backed securities 45,567 (73) 306 (2,353) 43,447 Mortgage-backed securities 25,696 (1) 89 (2,029) 23,755 Municipal 2,196 — 7 (160) 2,043 $ 113,479 $ (115) $ 1,012 $ (6,087) $ 108,289 December 31, 2023 Amortized Valuation Allowance Gross Gross Fair Value (in millions of U.S. dollars) Available-for-sale U.S. Treasury / Agency $ 3,721 $ — $ 13 $ (144) $ 3,590 Non-U.S. 35,918 (49) 592 (1,297) 35,164 Corporate and asset-backed securities 44,695 (104) 390 (2,151) 42,830 Mortgage-backed securities 23,720 (3) 143 (1,802) 22,058 Municipal 3,074 — 10 (155) 2,929 $ 111,128 $ (156) $ 1,148 $ (5,549) $ 106,571 The following table presents fixed maturities by contractual maturity: March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Net Carrying Value Fair Value Net Carrying Value Fair Value Available-for-sale Due in 1 year or less $ 4,521 $ 4,521 $ 4,729 $ 4,729 Due after 1 year through 5 years 33,533 33,533 33,573 33,573 Due after 5 years through 10 years 28,198 28,198 28,480 28,480 Due after 10 years 18,282 18,282 17,731 17,731 84,534 84,534 84,513 84,513 Mortgage-backed securities 23,755 23,755 22,058 22,058 $ 108,289 $ 108,289 $ 106,571 $ 106,571 Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. b) Gross unrealized loss Fixed maturities in an unrealized loss position at March 31, 2024, and December 31, 2023, comprised both investment grade and below investment grade securities for which fair value declined, principally due to rising interest rates since the date of purchase. Refer to Note 1 f) in the 2023 Form 10-K for further information on factors considered in the evaluation of expected credit losses. The following tables present, for available-for-sale (AFS) fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have expected credit losses, the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: 0 – 12 Months Over 12 Months Total March 31, 2024 Fair Value Gross Fair Value Gross Fair Value Gross (in millions of U.S. dollars) U.S. Treasury / Agency $ 632 $ (13) $ 2,007 $ (151) $ 2,639 $ (164) Non-U.S. 3,793 (64) 15,928 (1,079) 19,721 (1,143) Corporate and asset-backed securities 4,675 (71) 19,646 (1,487) 24,321 (1,558) Mortgage-backed securities 4,907 (82) 13,783 (1,919) 18,690 (2,001) Municipal 443 (12) 1,218 (148) 1,661 (160) Total AFS fixed maturities $ 14,450 $ (242) $ 52,582 $ (4,784) $ 67,032 $ (5,026) 0 – 12 Months Over 12 Months Total December 31, 2023 Fair Value Gross Fair Value Gross Fair Value Gross (in millions of U.S. dollars) U.S. Treasury / Agency $ 463 $ (9) $ 2,504 $ (135) $ 2,967 $ (144) Non-U.S. 2,464 (43) 15,971 (957) 18,435 (1,000) Corporate and asset-backed securities 2,866 (51) 20,334 (1,194) 23,200 (1,245) Mortgage-backed securities 1,659 (58) 13,831 (1,706) 15,490 (1,764) Municipal 1,117 (15) 1,310 (137) 2,427 (152) Total AFS fixed maturities $ 8,569 $ (176) $ 53,950 $ (4,129) $ 62,519 $ (4,305) At March 31, 2024, the tax benefit on certain unrealized losses in our investment portfolio was reduced by a valuation allowance of $543 million necessary due to limitations on the utilization of these losses. As part of evaluating whether it was more likely than not that we could realize these losses, we considered realized gains, carryback ability and available tax planning strategies. The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Available-for-sale Valuation allowance for expected credit losses - beginning of period $ 156 $ 169 Provision for expected credit loss 31 59 Write-offs charged against the expected credit loss (5) (2) Recovery of expected credit loss (67) (58) Valuation allowance for expected credit losses - end of period $ 115 $ 168 Held-to-maturity Valuation allowance for expected credit losses - beginning of period $ — $ 34 Recovery of expected credit loss — (1) Valuation allowance for expected credit losses - end of period $ — $ 33 Private debt held-for-investment Valuation allowance for expected credit losses - beginning of period $ 4 $ — Provision for expected credit loss 1 — Valuation allowance for expected credit losses - end of period $ 5 $ — c) Net realized gains (losses) The following table presents the components of net realized gains (losses): Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Fixed maturities: Gross realized gains $ 16 $ 2 Gross realized losses (141) (159) Other investments - Fixed maturities 168 — Net (provision for) recovery of expected credit losses 40 2 Impairment (1) (34) (25) Total fixed maturities 49 (180) Equity securities 3 11 Private equities (less than 3 percent ownership) 31 15 Foreign exchange (131) 131 Investment and embedded derivative instruments (43) (46) Other derivative instruments (2) (1) Other (8) (7) Net realized gains (losses) (pre-tax) $ (101) $ (77) (1) Relates to certain securities we intended to sell and securities written to market entering default. Realized gains and losses from Other investments, Equity securities and Private equities from the table above include sales of securities and unrealized gains and losses from fair value changes as follows: Three Months Ended March 31 2024 2023 (in millions of U.S. dollars) Equity Securities Other Investments Private Equities Total Equity Securities Private Equities Total Net gains (losses) recognized during the period $ 3 $ 168 $ 31 $ 202 $ 11 $ 15 $ 26 Less: Net gains (losses) recognized from sales of securities (3) — — (3) (5) — (5) Unrealized gains (losses) recognized for securities still held at reporting date $ 6 $ 168 $ 31 $ 205 $ 16 $ 15 $ 31 d) Private equities Private equities include investment funds and limited partnerships measured at fair value using net asset value (NAV) as a practical expedient. The following table presents, by investment category, the expected liquidation period, fair value, and maximum future funding commitments for private equities: Expected March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Fair Maximum Fair Maximum Financial 2 to 10 Years $ 1,289 $ 341 $ 1,241 $ 364 Real assets 2 to 13 Years 2,095 424 2,137 445 Distressed 2 to 8 Years 1,218 928 1,206 936 Private credit 3 to 8 Years 328 296 331 298 Traditional 2 to 14 Years 9,052 3,916 8,873 4,167 Vintage 1 to 3 Years 67 — 72 — Investment funds Not Applicable 232 — 218 — $ 14,281 $ 5,905 $ 14,078 $ 6,210 Included in all categories in the above table, except for Investment funds, are investments for which Chubb will never have the contractual option to redeem but receives distributions based on the liquidation of the underlying assets. Further, for all categories except for Investment funds, Chubb does not have the ability to sell or transfer the investments without the consent from the general partner of individual funds. Investment Category: Consists of investments in private equity funds: Financial targeting financial services companies, such as financial institutions and insurance services worldwide Real assets targeting investments related to hard physical assets, such as real estate, infrastructure, and natural resources Distressed targeting distressed corporate debt/credit and equity opportunities in the U.S. Private credit targeting privately originated corporate debt investments, including senior secured loans and subordinated bonds Traditional employing traditional private equity investment strategies, such as buyout and growth equity globally Vintage funds where the initial fund term has expired Investment funds employ various investment strategies, such as long/short equity and arbitrage/distressed. Included in this category are investments for which Chubb has the option to redeem at agreed upon value as described in each investment fund’s subscription agreement. Depending on the terms of the various subscription agreements, investment fund investments may be redeemed monthly, quarterly, semi-annually, or annually. If Chubb wishes to redeem an investment fund investment, it must first determine if the investment fund is still in a lock-up period (a time when Chubb cannot redeem its investment so that the investment fund manager has time to build the portfolio). If the investment fund is no longer in its lock-up period, Chubb must then notify the investment fund manager of its intention to redeem by the notification date prescribed by the subscription agreement. Subsequent to notification, the investment fund can redeem Chubb’s investment within several months of the notification. Notice periods for redemption of the investment funds are up to 270 days. Chubb can redeem its investment funds without consent from the investment fund managers. e) Restricted assets Chubb is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. Chubb is also required to restrict assets pledged under repurchase agreements, which represent Chubb's agreement to sell securities and repurchase them at a future date for a predetermined price. We use trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. We have investments in segregated portfolios primarily to provide collateral or guarantees for LOC and derivative transactions. Included in restricted assets at March 31, 2024, and December 31, 2023, are investments, primarily fixed maturities, totaling $18,568 million and $18,242 million, respectively, and cash of $143 million and $172 million, respectively. The following table presents the components of restricted assets: March 31 December 31 (in millions of U.S. dollars) 2024 2023 Trust funds $ 8,626 $ 8,482 Deposits with U.S. regulatory authorities 2,488 2,544 Deposits with non-U.S. regulatory authorities 3,595 3,584 Assets pledged under repurchase agreements 3,097 2,924 Other pledged assets 905 880 Total $ 18,711 $ 18,414 f) Variable interest entities (VIEs) Consolidated VIEs Certain subsidiaries of Huatai Group are the investment manager of, and maintain investments in, sponsored investment products that are considered Variable interest entities. We have determined that we are the primary beneficiary and consolidate these investment products if we hold at least 10 percent ownership. Refer to Note 1 g) of our 2023 Form 10-K for further information on our consolidation criteria. The assets of these VIEs are not available to our creditors, and the investors in these VIEs have no recourse to Chubb in excess of the assets contained within the VIEs. Our economic exposures are limited to our investments based on our ownership interest in these VIEs. Our total exposure to these consolidated investment products represents the value of our economic ownership interest. Unconsolidated VIEs We do not consolidate sponsored investment products where we have determined that we are not the primary beneficiary. The carrying value of these investments at March 31, 2024, and December 31, 2023, was $140 million and $153 million, respectively, and our maximum risk of loss approximates the carrying amount. These investments are classified within Equity securities.

Fair value measurements

Fair value measurements	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements a) Fair value hierarchy Fair value of financial assets and financial liabilities is estimated based on the framework established in the fair value accounting guidance. The guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The three levels of the hierarchy are as follows: • Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets; • Level 2 – Includes, among other items, inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves, quoted prices for similar assets and liabilities in active markets, and quoted prices for identical or similar assets and liabilities in markets that are not active; and • Level 3 – Inputs that are unobservable and reflect management’s judgments about assumptions that market participants would use in pricing an asset or liability. We categorize financial instruments within the valuation hierarchy at the balance sheet date based upon the lowest level of inputs that are significant to the fair value measurement. We use pricing services to obtain fair value measurements for the majority of our investment securities. Based on management’s understanding of the methodologies used, these pricing services only produce an estimate of fair value if there is observable market information that would allow them to make a fair value estimate. Based on our understanding of the market inputs used by the pricing services, all applicable investments have been valued in accordance with U.S. GAAP. We do not adjust prices obtained from pricing services. The following is a description of the valuation techniques and inputs used to determine fair values for financial instruments carried at fair value, as well as the general classification of such financial instruments pursuant to the valuation hierarchy. Fixed maturities We use pricing services to estimate fair value measurements for the majority of our fixed maturities. The pricing services use market quotations for fixed maturities that have quoted prices in active markets; such securities are classified within Level 1. For fixed maturities other than U.S. Treasury securities that generally do not trade on a daily basis, the pricing services prepare estimates of fair value measurements using their pricing applications or pricing models, which include available relevant market information, benchmark curves, benchmarking of like securities, sector groupings, and matrix pricing. Additional valuation factors that can be taken into account are nominal spreads, dollar basis, and liquidity adjustments. The pricing services evaluate each asset class based on relevant market and credit information, perceived market movements, and sector news. The market inputs used in the pricing evaluation, listed in the approximate order of priority include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, reference data, and industry and economic events. The extent of the use of each input is dependent on the asset class and the market conditions. Given the asset class, the priority of the use of inputs may change, or some market inputs may not be relevant. Additionally, fixed maturities valuation is more subjective when markets are less liquid due to the lack of market-based inputs (i.e., stale pricing) and may require the use of models to be priced. The lack of market-based inputs may increase the potential that an investment's estimated fair value is not reflective of the price at which an actual transaction would occur. The overwhelming majority of fixed maturities are classified within Level 2 because the most significant inputs used in the pricing techniques are observable. For a small number of fixed maturities, we obtain a single broker quote (typically from a market maker). Due to the disclaimers on the quotes that indicate that the price is indicative only, we include these fair value estimates in Level 3. Equity securities Equity securities with active markets are classified within Level 1 as fair values are based on quoted market prices. For equity securities in markets which are less active, fair values are based on market valuations and are classified within Level 2. Equity securities for which pricing is unobservable are classified within Level 3. Short-term investments Short-term investments, which comprise securities due to mature within one year of the date of purchase that are traded in active markets, are classified within Level 1 as fair values are based on quoted market prices. Securities such as commercial paper and discount notes are classified within Level 2 because these securities are typically not actively traded due to their approaching maturity, and as such, their cost approximates fair value. Short-term investments for which pricing is unobservable are classified within Level 3. Private equities Fair values for Private equities including investments in partially-owned investment companies, investment funds, and limited partnerships are based on their respective NAV and are excluded from the fair value hierarchy table below. Other investments Certain of our long-duration contracts are supported by assets that do not qualify for separate account reporting under U.S. GAAP. These assets comprise mutual funds, classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Other investments principally include fixed maturities carried at fair value with changes in fair value recorded through the Consolidated statements of operations. These fixed maturities principally relate to the acquired Huatai investment portfolio and are classified within Level 2. Also included are life insurance policies collateralizing investments held in rabbi trusts maintained by Chubb for deferred compensation plans and supplemental retirement plans. These policies are carried at cash surrender value and are classified in the valuation hierarchy within Level 2. Securities lending collateral The underlying assets included in Securities lending collateral in the Consolidated balance sheets are fixed maturities which are classified in the valuation hierarchy on the same basis as other fixed maturities. Excluded from the valuation hierarchy is the corresponding liability related to Chubb’s obligation to return the collateral plus interest as it is reported at contract value and not fair value in the Consolidated balance sheets. Investment derivatives Actively traded investment derivative instruments, including futures, options, and forward contracts are classified within Level 1 as fair values are based on quoted market prices. The fair value of cross-currency swaps and interest rate swaps is based on market valuations and is classified within Level 2. Investment derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets. Derivatives designated as hedging instruments Certain of our derivatives are cross-currency swaps designated as fair value and net investment hedging instruments. The fair value of cross-currency swaps and interest rate swaps is based on market valuations and is classified within Level 2. Investment derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets. Other derivative instruments We maintain positions in exchange-traded equity futures contracts designed to limit exposure to a severe equity market decline, which would cause an increase in expected market risk benefits (MRB) claims, and therefore, an increase in MRB reserves. Our positions in exchange-traded equity futures contracts are classified within Level 1. The fair value of the majority of the remaining positions in other derivative instruments is based on significant observable inputs including equity security and interest rate indices. Accordingly, these are classified within Level 2. Other derivative instruments based on unobservable inputs are classified within Level 3. Other derivative instruments are recorded in either Other assets or Accounts payable, accrued expenses, and other liabilities in the Consolidated balance sheets. Separate account assets Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. Separate account assets principally comprise mutual funds classified within Level 1 in the valuation hierarchy on the same basis as other equity securities traded in active markets. Separate account assets also include fixed maturities classified within Level 2 because the most significant inputs used in the pricing techniques are observable. Excluded from the valuation hierarchy are the corresponding liabilities as they are reported at contract value and not fair value in the Consolidated balance sheets. Financial instruments measured at fair value on a recurring basis, by valuation hierarchy March 31, 2024 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available-for-sale U.S. Treasury / Agency $ 2,251 $ 648 $ — $ 2,899 Non-U.S. — 35,427 718 36,145 Corporate and asset-backed securities — 40,789 2,658 43,447 Mortgage-backed securities — 23,748 7 23,755 Municipal — 2,043 — 2,043 2,251 102,655 3,383 108,289 Equity securities 3,668 — 101 3,769 Short-term investments 3,292 1,810 5 5,107 Other investments (1) 583 4,897 — 5,480 Securities lending collateral — 1,708 — 1,708 Investment derivatives 28 — — 28 Derivatives designated as hedging instruments — 149 — 149 Other derivative instruments 1 — — 1 Separate account assets 5,775 89 — 5,864 Total assets measured at fair value (1)(2) $ 15,598 $ 111,308 $ 3,489 $ 130,395 Liabilities: Investment derivatives $ 144 $ — $ — $ 144 Derivatives designated as hedging instruments — 110 — 110 Other derivative instruments 22 6 — 28 Market risk benefits (3) — — 611 611 Total liabilities measured at fair value $ 166 $ 116 $ 611 $ 893 (1) Excluded from the table above are other investments of $736 million, principally policy loans at March 31, 2024, measured using NAV as a practical expedient. (2) Excluded from the table above are Private equities of $14,281 million at March 31, 2024, measured using NAV as a practical expedient. (3) Refer to Note 10 for additional information on Market risk benefits. December 31, 2023 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available-for-sale U.S. Treasury / Agency $ 2,911 $ 679 $ — $ 3,590 Non-U.S. — 34,472 692 35,164 Corporate and asset-backed securities — 40,208 2,622 42,830 Mortgage-backed securities — 22,051 7 22,058 Municipal — 2,929 — 2,929 2,911 100,339 3,321 106,571 Equity securities 3,368 — 87 3,455 Short-term investments 1,915 2,633 3 4,551 Other investments (1) 589 4,236 — 4,825 Securities lending collateral — 1,299 — 1,299 Investment derivatives 54 — — 54 Derivatives designated as hedging instruments — 136 — 136 Separate account assets 5,482 91 — 5,573 Total assets measured at fair value (1)(2) $ 14,319 $ 108,734 $ 3,411 $ 126,464 Liabilities: Investment derivatives $ 136 $ — $ — $ 136 Derivatives designated as hedging instruments — 128 — 128 Other derivative instruments 37 5 — 42 Market risk benefits (3) — — 771 771 Total liabilities measured at fair value $ 173 $ 133 $ 771 $ 1,077 (1) Excluded from the table above are other investments of $702 million, principally policy loans at December 31, 2023, measured using NAV as a practical expedient. (2) Excluded from the table above are Private equities of $14,078 million at December 31, 2023, measured using NAV as a practical expedient. (3) Refer to Note 10 for additional information on Market risk benefits. Level 3 financial instruments The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3). Three Months Ended Available-for-Sale Debt Securities Equity Short-term investments Non-U.S. Corporate and asset- Mortgage-backed securities Balance, beginning of period $ 692 $ 2,622 $ 7 $ 87 $ 3 Transfers into Level 3 1 1 — — — Transfers out of Level 3 (4) (3) — — — Change in Net Unrealized Gains (Losses) in OCI 14 6 — — — Net Realized Gains (Losses) — — — (3) — Purchases 72 143 — 18 4 Sales (20) (20) — (1) — Settlements (37) (91) — — (2) Balance, end of period $ 718 $ 2,658 $ 7 $ 101 $ 5 Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date $ — $ — $ — $ (2) $ — Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date $ 13 $ 6 $ — $ — $ — Three Months Ended Available-for-Sale Debt Securities Equity Short-term investments Non-U.S. Corporate and asset- Mortgage-backed securities Balance, beginning of period $ 564 $ 2,449 $ 11 $ 90 $ 3 Transfers out of Level 3 — (11) — — — Change in Net Unrealized Gains (Losses) in OCI (4) (2) — — (1) Net Realized Gains (Losses) — 2 — (4) — Purchases 43 205 — 7 5 Sales (31) (20) — (5) — Settlements (11) (79) (1) — — Balance, end of period $ 561 $ 2,544 $ 10 $ 88 $ 7 Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date $ — $ 4 $ — $ (3) $ — Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date $ (6) $ (5) $ — $ — $ (1) Excluded from the tables above is the reconciliation of Market risk benefits, which are presented in Note 10 Market risk benefits. Refer to Note 10 for additional information. b) Financial instruments disclosed, but not measured, at fair value Chubb uses various financial instruments in the normal course of its business. Our insurance contracts are excluded from fair value of financial instruments accounting guidance, and therefore, are not included in the amounts discussed below. The carrying values of cash, other assets, other liabilities, and other financial instruments not included below approximated their fair values. Refer to the 2023 Form 10-K for information on the fair value methods and assumptions for private debt held-for-investment, short-term and long-term debt, repurchase agreements, and trust-preferred securities. The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value: March 31, 2024 Fair Value Net Carrying (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Private debt held-for-investment $ — $ — $ 2,733 $ 2,733 $ 2,708 Total assets $ — $ — $ 2,733 $ 2,733 $ 2,708 Liabilities: Repurchase agreements $ — $ 3,022 $ — $ 3,022 $ 3,022 Short-term debt — 2,228 — 2,228 2,265 Long-term debt — 11,930 — 11,930 13,248 Trust preferred securities — 365 — 365 309 Total liabilities $ — $ 17,545 $ — $ 17,545 $ 18,844 December 31, 2023 Fair Value Net Carrying (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Private debt held-for-investment $ — $ — $ 2,560 $ 2,560 $ 2,553 Total assets $ — $ — $ 2,560 $ 2,560 $ 2,553 Liabilities: Repurchase agreements $ — $ 2,833 $ — $ 2,833 $ 2,833 Short-term debt — 1,431 — 1,431 1,460 Long-term debt — 11,924 — 11,924 13,035 Trust preferred securities — 365 — 365 308 Total liabilities $ — $ 16,553 $ — $ 16,553 $ 17,636

Reinsurance

Reinsurance	3 Months Ended
	Mar. 31, 2024
Reinsurance Disclosures [Abstract]
Reinsurance [Text Block]	Reinsurance Reinsurance recoverable on ceded reinsurance March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Net Reinsurance Recoverable (1) Valuation allowance Net Reinsurance Recoverable (1) Valuation allowance Reinsurance recoverable on unpaid losses and loss expenses $ 17,163 $ 290 $ 17,884 $ 285 Reinsurance recoverable on paid losses and loss expenses 1,946 85 2,068 82 Reinsurance recoverable on losses and loss expenses $ 19,109 $ 375 $ 19,952 $ 367 Reinsurance recoverable on policy benefits $ 272 $ — $ 280 $ — (1) Net of valuation allowance for uncollectible reinsurance. The decrease in Reinsurance recoverable on losses and loss expenses was primarily due to a seasonal decrease in crop recoverables and a commutation in connection with a large structured transaction during the quarter. The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Valuation allowance for uncollectible reinsurance - beginning of period $ 367 $ 351 Provision for uncollectible reinsurance 8 5 Write-offs charged against the valuation allowance — (5) Valuation allowance for uncollectible reinsurance - end of period $ 375 $ 351 For additional information, refer to Note 1 e) to the Consolidated Financial Statements of our 2023 Form 10-K.

Deferred acquisition costs

Deferred acquisition costs	3 Months Ended
	Mar. 31, 2024
Deferred Policy Acquisition Costs Disclosures [Abstract]
Deferred Policy Acquisition Costs	Deferred acquisition costs Deferred acquisition costs comprise capitalized costs on short-duration contracts of $3,510 million and $3,003 million and long-duration contracts of $4,027 million and $3,293 million at March 31, 2024, and 2023, respectively. The following tables present a roll-forward of deferred acquisitions costs on long-duration contracts included in the Life Insurance segment: Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Universal Life Whole Life A&H Other Total Balance – beginning of period $ 402 $ 674 $ 534 $ 1,301 $ 274 $ 3,185 Capitalizations 47 33 85 158 16 339 Amortization expense (28) (20) (8) (41) (7) (104) Other (including foreign exchange) (8) 1 (3) 3 (2) (9) Balance - end of period $ 413 $ 688 $ 608 $ 1,421 $ 281 $ 3,411 Overseas General Insurance segment excluded from table 616 Total deferred acquisition costs on long-duration contracts $ 4,027 Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Universal Life Whole Life A&H Other Total Balance – beginning of period $ 324 $ 639 $ 392 $ 891 $ 268 $ 2,514 Capitalizations 42 25 28 123 4 222 Amortization expense (24) (19) (5) (30) (6) (84) Other (including foreign exchange) 7 (1) 9 (15) (1) (1) Balance - end of period $ 349 $ 644 $ 424 $ 969 $ 265 $ 2,651 Overseas General Insurance segment excluded from table 642 Total deferred acquisition costs on long-duration contracts $ 3,293

Unpaid losses and loss expenses

Unpaid losses and loss expenses	3 Months Ended
	Mar. 31, 2024
Liability for Claims and Claims Adjustment Expense [Abstract]
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]	Unpaid losses and loss expenses The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Gross unpaid losses and loss expenses – beginning of period $ 80,122 $ 75,747 Reinsurance recoverable on unpaid losses – beginning of period (1) (17,884) (17,086) Net unpaid losses and loss expenses – beginning of period 62,238 58,661 Net losses and loss expenses incurred in respect of losses occurring in: Current year 5,980 5,336 Prior years (2) (253) (188) Total 5,727 5,148 Net losses and loss expenses paid in respect of losses occurring in: Current year 767 805 Prior years 4,055 3,911 Total 4,822 4,716 Foreign currency revaluation and other 35 (196) Net unpaid losses and loss expenses – end of period 63,178 58,897 Reinsurance recoverable on unpaid losses (1) 17,163 16,520 Gross unpaid losses and loss expenses – end of period $ 80,341 $ 75,417 (1) Net of valuation allowance for uncollectible reinsurance. (2) Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and A&H long-duration lines totaling $46 million and $(8) million for the three months ended March 31, 2024 and 2023, respectively. Net unpaid losses and loss expenses increased $940 million for the three months ended March 31, 2024, principally reflecting underlying exposure growth and the impact of a reinsurance commutation in connection with a large structured transaction during the quarter, partially offset by the impact of favorable prior period development and crop activity. Prior Period Development Prior period development (PPD) arises from changes to loss estimates recognized in the current year that relate to loss events that occurred in previous calendar years and excludes the effect of losses from the development of earned premium from previous accident years. Long-tail lines include lines such as workers' compensation, general liability, and financial lines; while short-tail lines include lines such as most property lines, energy, personal accident, and agriculture. The following table summarizes (favorable) and adverse PPD by segment: Three Months Ended March 31 (in millions of U.S. dollars) Long-tail Short-tail Total 2024 North America Commercial P&C Insurance $ 96 $ (144) $ (48) North America Personal P&C Insurance — (52) (52) North America Agricultural Insurance — (28) (28) Overseas General Insurance (1) (88) (89) Global Reinsurance — 1 1 Corporate 9 — 9 Total $ 104 $ (311) $ (207) 2023 North America Commercial P&C Insurance $ 9 $ (81) $ (72) North America Personal P&C Insurance — 17 17 North America Agricultural Insurance — — — Overseas General Insurance — (143) (143) Global Reinsurance — (8) (8) Corporate 10 — 10 Total $ 19 $ (215) $ (196) Significant prior period movements by segment, principally driven by reserve reviews completed during each respective period, are discussed in more detail below. The remaining net development for long-tail lines and short-tail business for each segment and Corporate comprises numerous favorable and adverse movements across a number of lines and accident years, none of which is significant individually or in the aggregate. North America Commercial P&C Insurance . Net favorable development for the three months ended March 31, 2024, included $74 million in surety lines and $62 million in property and marine lines due to lower-than-expected loss development. The favorable development was partially offset by net adverse development of $102 million in commercial excess and umbrella lines, driven by higher-than-expected loss development. Net favorable development for the three months ended March 31, 2023, was $72 million favorable with $81 million favorable in short-tail lines and $9 million adverse in long-tail lines. The short tail development was primarily in surety and A&H, partially offset by adverse development in property and marine due to the net impact of positive development from Hurricane Ian and negative development from Winter Storm Elliott. The long-tail development was the net of favorable developments in specialty casualty and workers comp due to lower than expected paid and reported loss activity offset by adverse development in general liability and certain financial lines due to higher-than-expected development. Overseas General Insurance. Net favorable development for the three months ended March 31, 2024, was $89 million, which included $58 million in property lines driven by favorable development across all regions, primarily in accident years 2020 through 2023. Net favorable development for the three months ended March 31, 2023 included $85 million in property lines, driven by lower-than-expected catastrophe loss development activity of $43 million in accident year 2022, and non-catastrophe loss emergence in Continental Europe and the U.K. The following tables present a roll-forward of the liability for future policy benefits included in the Life Insurance segment: Present Value of Expected Net Premiums Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,590 $ 3,950 $ 10,432 $ 64 $ 16,036 Beginning balance at original discount rate 1,992 3,945 10,692 64 16,693 Effect of changes in cash flow assumptions 6 70 109 — 185 Effect of actual variances from expected experience (1) 22 (37) — (16) Adjusted beginning of period balance 1,997 4,037 10,764 64 16,862 Issuances 65 295 697 2 1,059 Interest accrual 14 27 133 — 174 Net premiums collected (1) (57) (310) (363) (7) (737) Other (including foreign exchange) (5) (4) 82 — 73 Ending balance at original discount rate 2,014 4,045 11,313 59 17,431 Effect of changes in discount rate assumptions (407) 18 (295) — (684) Balance – end of period $ 1,607 $ 4,063 $ 11,018 $ 59 $ 16,747 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,254 $ 10,063 $ 14,650 $ 495 $ 27,462 Beginning balance at original discount rate 2,749 9,991 15,071 492 28,303 Effect of changes in cash flow assumptions 8 86 100 — 194 Effect of actual variances from expected experience 3 27 (36) — (6) Adjusted beginning of period balance 2,760 10,104 15,135 492 28,491 Issuances 65 295 697 2 1,059 Interest accrual 19 74 164 3 260 Benefits payments (59) (87) (398) (6) (550) Other (including foreign exchange) 30 (2) 114 21 163 Ending balance at original discount rate 2,815 10,384 15,712 512 29,423 Effect of changes in discount rate assumptions (516) 184 (487) 18 (801) Balance – end of period $ 2,299 $ 10,568 $ 15,225 $ 530 $ 28,622 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 692 $ 6,505 $ 4,207 $ 471 $ 11,875 Deferred profit liability 254 904 174 19 1,351 Net liability for future policy benefits, before reinsurance recoverable 946 7,409 4,381 490 13,226 Less: Reinsurance recoverable on future policy benefits 107 45 113 1 266 Net liability for future policy benefits, after reinsurance recoverable $ 839 $ 7,364 $ 4,268 $ 489 $ 12,960 Weighted average duration (years) 10.2 25.6 10.1 15.1 19.3 Present Value of Expected Net Premiums Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,806 $ 2,308 $ 10,711 $ 42 $ 14,867 Beginning balance at original discount rate 1,867 2,361 11,258 43 15,529 Effect of changes in cash flow assumptions 17 (1) (786) 1 (769) Effect of actual variances from expected experience (6) (8) (89) (1) (104) Adjusted beginning of period balance 1,878 2,352 10,383 43 14,656 Issuances 36 69 288 1 394 Interest accrual 28 18 125 — 171 Net premiums collected (1) (44) (82) (327) (6) (459) Other (including foreign exchange) 35 8 (139) 1 (95) Ending balance at original discount rate 1,933 2,365 10,330 39 14,667 Effect of changes in discount rate assumptions (48) (8) (263) — (319) Balance – end of period $ 1,885 $ 2,357 $ 10,067 $ 39 $ 14,348 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,321 $ 5,696 $ 15,038 $ 269 $ 23,324 Beginning balance at original discount rate 2,447 5,874 15,855 280 24,456 Effect of changes in cash flow assumptions 20 (1) (798) 3 (776) Effect of actual variances from expected experience (3) (7) (87) (1) (98) Adjusted beginning of period balance 2,464 5,866 14,970 282 23,582 Issuances 36 69 288 1 394 Interest accrual 32 52 156 2 242 Benefit payments (46) (65) (362) (3) (476) Other (including foreign exchange) 72 28 (153) (14) (67) Ending balance at original discount rate 2,558 5,950 14,899 268 23,675 Effect of changes in discount rate assumptions (118) (42) (463) — (623) Balance – end of period $ 2,440 $ 5,908 $ 14,436 $ 268 $ 23,052 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 555 $ 3,551 $ 4,369 $ 229 $ 8,704 Deferred profit liability 223 581 135 13 952 Net liability for future policy benefits, before reinsurance recoverable 778 4,132 4,504 242 9,656 Less: Reinsurance recoverable on future policy benefits 105 33 112 — 250 Net liability for future policy benefits, after reinsurance recoverable $ 673 $ 4,099 $ 4,392 $ 242 $ 9,406 Weighted average duration (years) 9.4 25.3 10.7 14.5 17.7 The following table presents a reconciliation of the roll-forwards above to the Future policy benefits liability presented in the Consolidated balance sheets. March 31 (in millions of U.S. dollars) 2024 2023 Net liability for future policy benefits, Life Insurance segment $ 11,875 $ 8,704 Other (1) 1,149 1,126 Deferred profit liability 1,351 952 Liability for future policy benefits, per consolidated balance sheet $ 14,375 $ 10,782 (1) Other business principally comprises certain Overseas General Insurance accident and health (A&H) policies and certain Chubb Life Re business. The following table presents the amount of undiscounted and discounted expected gross premiums and expected future policy benefit payments included in the Life Insurance segment: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Term Life Undiscounted expected future benefit payments $ 4,358 $ 4,041 Undiscounted expected future gross premiums 7,291 6,452 Discounted expected future benefit payments 2,299 2,440 Discounted expected future gross premiums 3,909 3,773 Whole Life Undiscounted expected future benefit payments 24,834 16,446 Undiscounted expected future gross premiums 9,593 6,895 Discounted expected future benefit payments 10,568 5,908 Discounted expected future gross premiums 7,774 5,398 A&H Undiscounted expected future benefit payments 26,475 23,186 Undiscounted expected future gross premiums 39,002 33,809 Discounted expected future benefit payments 15,225 14,436 Discounted expected future gross premiums 22,975 20,766 Other Undiscounted expected future benefit payments 901 342 Undiscounted expected future gross premiums 94 97 Discounted expected future benefit payments 530 268 Discounted expected future gross premiums $ 83 $ 87 The following table presents the amount of revenue and interest recognized in the Consolidated statement of operations for the Life Insurance segment: Gross Premiums or Assessments Interest Accretion Three Months Ended Three Months Ended March 31 March 31 (in millions of U.S. dollars) 2024 2023 2024 2023 Life Insurance Term Life $ 167 $ 160 $ 5 $ 4 Whole Life 530 230 47 34 A&H 753 733 31 31 Other 20 17 3 2 Total $ 1,470 $ 1,140 $ 86 $ 71 The following table presents the weighted-average interest rates for the Life Insurance segment: Interest Accretion Rate Current Discount Rate March 31 March 31 2024 2023 2024 2023 Life Insurance Term Life 2.9 % 2.8 % 5.7 % 5.7 % Whole Life 3.2 % 4.0 % 4.5 % 5.2 % A&H 3.7 % 3.8 % 6.3 % 6.2 % Other 2.6 % 3.8 % 3.8 % 4.8 %

Future policy benefits

Future policy benefits	3 Months Ended
	Mar. 31, 2024
Liability for Future Policy Benefits Activity [Abstract]
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]	Unpaid losses and loss expenses The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Gross unpaid losses and loss expenses – beginning of period $ 80,122 $ 75,747 Reinsurance recoverable on unpaid losses – beginning of period (1) (17,884) (17,086) Net unpaid losses and loss expenses – beginning of period 62,238 58,661 Net losses and loss expenses incurred in respect of losses occurring in: Current year 5,980 5,336 Prior years (2) (253) (188) Total 5,727 5,148 Net losses and loss expenses paid in respect of losses occurring in: Current year 767 805 Prior years 4,055 3,911 Total 4,822 4,716 Foreign currency revaluation and other 35 (196) Net unpaid losses and loss expenses – end of period 63,178 58,897 Reinsurance recoverable on unpaid losses (1) 17,163 16,520 Gross unpaid losses and loss expenses – end of period $ 80,341 $ 75,417 (1) Net of valuation allowance for uncollectible reinsurance. (2) Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and A&H long-duration lines totaling $46 million and $(8) million for the three months ended March 31, 2024 and 2023, respectively. Net unpaid losses and loss expenses increased $940 million for the three months ended March 31, 2024, principally reflecting underlying exposure growth and the impact of a reinsurance commutation in connection with a large structured transaction during the quarter, partially offset by the impact of favorable prior period development and crop activity. Prior Period Development Prior period development (PPD) arises from changes to loss estimates recognized in the current year that relate to loss events that occurred in previous calendar years and excludes the effect of losses from the development of earned premium from previous accident years. Long-tail lines include lines such as workers' compensation, general liability, and financial lines; while short-tail lines include lines such as most property lines, energy, personal accident, and agriculture. The following table summarizes (favorable) and adverse PPD by segment: Three Months Ended March 31 (in millions of U.S. dollars) Long-tail Short-tail Total 2024 North America Commercial P&C Insurance $ 96 $ (144) $ (48) North America Personal P&C Insurance — (52) (52) North America Agricultural Insurance — (28) (28) Overseas General Insurance (1) (88) (89) Global Reinsurance — 1 1 Corporate 9 — 9 Total $ 104 $ (311) $ (207) 2023 North America Commercial P&C Insurance $ 9 $ (81) $ (72) North America Personal P&C Insurance — 17 17 North America Agricultural Insurance — — — Overseas General Insurance — (143) (143) Global Reinsurance — (8) (8) Corporate 10 — 10 Total $ 19 $ (215) $ (196) Significant prior period movements by segment, principally driven by reserve reviews completed during each respective period, are discussed in more detail below. The remaining net development for long-tail lines and short-tail business for each segment and Corporate comprises numerous favorable and adverse movements across a number of lines and accident years, none of which is significant individually or in the aggregate. North America Commercial P&C Insurance . Net favorable development for the three months ended March 31, 2024, included $74 million in surety lines and $62 million in property and marine lines due to lower-than-expected loss development. The favorable development was partially offset by net adverse development of $102 million in commercial excess and umbrella lines, driven by higher-than-expected loss development. Net favorable development for the three months ended March 31, 2023, was $72 million favorable with $81 million favorable in short-tail lines and $9 million adverse in long-tail lines. The short tail development was primarily in surety and A&H, partially offset by adverse development in property and marine due to the net impact of positive development from Hurricane Ian and negative development from Winter Storm Elliott. The long-tail development was the net of favorable developments in specialty casualty and workers comp due to lower than expected paid and reported loss activity offset by adverse development in general liability and certain financial lines due to higher-than-expected development. Overseas General Insurance. Net favorable development for the three months ended March 31, 2024, was $89 million, which included $58 million in property lines driven by favorable development across all regions, primarily in accident years 2020 through 2023. Net favorable development for the three months ended March 31, 2023 included $85 million in property lines, driven by lower-than-expected catastrophe loss development activity of $43 million in accident year 2022, and non-catastrophe loss emergence in Continental Europe and the U.K. The following tables present a roll-forward of the liability for future policy benefits included in the Life Insurance segment: Present Value of Expected Net Premiums Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,590 $ 3,950 $ 10,432 $ 64 $ 16,036 Beginning balance at original discount rate 1,992 3,945 10,692 64 16,693 Effect of changes in cash flow assumptions 6 70 109 — 185 Effect of actual variances from expected experience (1) 22 (37) — (16) Adjusted beginning of period balance 1,997 4,037 10,764 64 16,862 Issuances 65 295 697 2 1,059 Interest accrual 14 27 133 — 174 Net premiums collected (1) (57) (310) (363) (7) (737) Other (including foreign exchange) (5) (4) 82 — 73 Ending balance at original discount rate 2,014 4,045 11,313 59 17,431 Effect of changes in discount rate assumptions (407) 18 (295) — (684) Balance – end of period $ 1,607 $ 4,063 $ 11,018 $ 59 $ 16,747 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,254 $ 10,063 $ 14,650 $ 495 $ 27,462 Beginning balance at original discount rate 2,749 9,991 15,071 492 28,303 Effect of changes in cash flow assumptions 8 86 100 — 194 Effect of actual variances from expected experience 3 27 (36) — (6) Adjusted beginning of period balance 2,760 10,104 15,135 492 28,491 Issuances 65 295 697 2 1,059 Interest accrual 19 74 164 3 260 Benefits payments (59) (87) (398) (6) (550) Other (including foreign exchange) 30 (2) 114 21 163 Ending balance at original discount rate 2,815 10,384 15,712 512 29,423 Effect of changes in discount rate assumptions (516) 184 (487) 18 (801) Balance – end of period $ 2,299 $ 10,568 $ 15,225 $ 530 $ 28,622 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 692 $ 6,505 $ 4,207 $ 471 $ 11,875 Deferred profit liability 254 904 174 19 1,351 Net liability for future policy benefits, before reinsurance recoverable 946 7,409 4,381 490 13,226 Less: Reinsurance recoverable on future policy benefits 107 45 113 1 266 Net liability for future policy benefits, after reinsurance recoverable $ 839 $ 7,364 $ 4,268 $ 489 $ 12,960 Weighted average duration (years) 10.2 25.6 10.1 15.1 19.3 Present Value of Expected Net Premiums Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,806 $ 2,308 $ 10,711 $ 42 $ 14,867 Beginning balance at original discount rate 1,867 2,361 11,258 43 15,529 Effect of changes in cash flow assumptions 17 (1) (786) 1 (769) Effect of actual variances from expected experience (6) (8) (89) (1) (104) Adjusted beginning of period balance 1,878 2,352 10,383 43 14,656 Issuances 36 69 288 1 394 Interest accrual 28 18 125 — 171 Net premiums collected (1) (44) (82) (327) (6) (459) Other (including foreign exchange) 35 8 (139) 1 (95) Ending balance at original discount rate 1,933 2,365 10,330 39 14,667 Effect of changes in discount rate assumptions (48) (8) (263) — (319) Balance – end of period $ 1,885 $ 2,357 $ 10,067 $ 39 $ 14,348 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,321 $ 5,696 $ 15,038 $ 269 $ 23,324 Beginning balance at original discount rate 2,447 5,874 15,855 280 24,456 Effect of changes in cash flow assumptions 20 (1) (798) 3 (776) Effect of actual variances from expected experience (3) (7) (87) (1) (98) Adjusted beginning of period balance 2,464 5,866 14,970 282 23,582 Issuances 36 69 288 1 394 Interest accrual 32 52 156 2 242 Benefit payments (46) (65) (362) (3) (476) Other (including foreign exchange) 72 28 (153) (14) (67) Ending balance at original discount rate 2,558 5,950 14,899 268 23,675 Effect of changes in discount rate assumptions (118) (42) (463) — (623) Balance – end of period $ 2,440 $ 5,908 $ 14,436 $ 268 $ 23,052 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 555 $ 3,551 $ 4,369 $ 229 $ 8,704 Deferred profit liability 223 581 135 13 952 Net liability for future policy benefits, before reinsurance recoverable 778 4,132 4,504 242 9,656 Less: Reinsurance recoverable on future policy benefits 105 33 112 — 250 Net liability for future policy benefits, after reinsurance recoverable $ 673 $ 4,099 $ 4,392 $ 242 $ 9,406 Weighted average duration (years) 9.4 25.3 10.7 14.5 17.7 The following table presents a reconciliation of the roll-forwards above to the Future policy benefits liability presented in the Consolidated balance sheets. March 31 (in millions of U.S. dollars) 2024 2023 Net liability for future policy benefits, Life Insurance segment $ 11,875 $ 8,704 Other (1) 1,149 1,126 Deferred profit liability 1,351 952 Liability for future policy benefits, per consolidated balance sheet $ 14,375 $ 10,782 (1) Other business principally comprises certain Overseas General Insurance accident and health (A&H) policies and certain Chubb Life Re business. The following table presents the amount of undiscounted and discounted expected gross premiums and expected future policy benefit payments included in the Life Insurance segment: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Term Life Undiscounted expected future benefit payments $ 4,358 $ 4,041 Undiscounted expected future gross premiums 7,291 6,452 Discounted expected future benefit payments 2,299 2,440 Discounted expected future gross premiums 3,909 3,773 Whole Life Undiscounted expected future benefit payments 24,834 16,446 Undiscounted expected future gross premiums 9,593 6,895 Discounted expected future benefit payments 10,568 5,908 Discounted expected future gross premiums 7,774 5,398 A&H Undiscounted expected future benefit payments 26,475 23,186 Undiscounted expected future gross premiums 39,002 33,809 Discounted expected future benefit payments 15,225 14,436 Discounted expected future gross premiums 22,975 20,766 Other Undiscounted expected future benefit payments 901 342 Undiscounted expected future gross premiums 94 97 Discounted expected future benefit payments 530 268 Discounted expected future gross premiums $ 83 $ 87 The following table presents the amount of revenue and interest recognized in the Consolidated statement of operations for the Life Insurance segment: Gross Premiums or Assessments Interest Accretion Three Months Ended Three Months Ended March 31 March 31 (in millions of U.S. dollars) 2024 2023 2024 2023 Life Insurance Term Life $ 167 $ 160 $ 5 $ 4 Whole Life 530 230 47 34 A&H 753 733 31 31 Other 20 17 3 2 Total $ 1,470 $ 1,140 $ 86 $ 71 The following table presents the weighted-average interest rates for the Life Insurance segment: Interest Accretion Rate Current Discount Rate March 31 March 31 2024 2023 2024 2023 Life Insurance Term Life 2.9 % 2.8 % 5.7 % 5.7 % Whole Life 3.2 % 4.0 % 4.5 % 5.2 % A&H 3.7 % 3.8 % 6.3 % 6.2 % Other 2.6 % 3.8 % 3.8 % 4.8 %

Policyholders' account balances

Policyholders' account balances, Separate accounts, and Unearned revenue liabilities	3 Months Ended
	Mar. 31, 2024
Policyholder Account Balance [Abstract]
Policyholders' Account Balances, Separate Accounts, and Unearned Revenue Liability	Policyholders' account balances, Separate accounts, and Unearned revenue liabilities Policyholders' account balances The following tables present a roll-forward of policyholders' account balances: Three Months Ended March 31, 2024 (in millions of U.S. dollars) Universal Life Annuities (2) Other (3) Total Balance – beginning of period $ 1,876 $ 2,411 $ 2,502 $ 6,789 Premiums received 72 131 131 334 Policy charges (1) (34) — (2) (36) Surrenders and withdrawals (32) (10) (77) (119) Benefit payments (4) (54) (59) (3) (116) Interest credited 13 16 14 43 Other (including foreign exchange) (1) (5) (9) (15) Balance – end of period $ 1,840 $ 2,484 $ 2,556 $ 6,880 Unearned revenue liability 680 Policyholders' account liability, per consolidated balance sheet $ 7,560 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Relates to Huatai Life. (3) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (4) Includes benefit payments upon maturity as well as death benefits. Three Months Ended March 31, 2023 (in millions of U.S. dollars) Universal Life Other (2) Total Balance – beginning of period $ 1,199 $ 1,374 $ 2,573 Premiums received 50 18 68 Policy charges (1) (30) (4) (34) Surrenders and withdrawals (15) (8) (23) Benefit payments (3) (4) (6) (10) Interest credited 8 8 16 Other (including foreign exchange) — 3 3 Balance – end of period $ 1,208 $ 1,385 $ 2,593 Unearned revenue liability 585 Policyholders' account liability, per consolidated balance sheet $ 3,178 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (3) Includes benefit payments upon maturity as well as death benefits. March 31 2024 2023 (in millions of U.S. dollars, except for percentages) Universal Life Annuities Other Universal Life Other Weighted-average crediting rate 2.9 % 2.6 % 2.5 % 2.6 % 3.0 % Net amount at risk (1) $ 12,014 $ — $ 499 $ 11,394 $ 156 Cash Surrender Value $ 1,623 $ 1,605 $ 2,239 $ 1,005 $ 1,075 (1) For those guarantees of benefits that are payable in the event of death, the net amount at risk is defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date. The following tables present the balance of account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimum: Universal Life March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 482 $ — $ 39 $ 49 $ 570 2.01% – 4.00% 67 461 728 — 1,256 Greater than 4.00% 14 — — — 14 Total $ 563 $ 461 $ 767 $ 49 $ 1,840 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 455 $ — $ 32 $ 7 $ 494 2.01% – 4.00% 69 345 280 — 694 Greater than 4.00% 20 — — — 20 Total $ 544 $ 345 $ 312 $ 7 $ 1,208 Annuities March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 720 $ — $ 1,624 $ 1 $ 2,345 2.01% – 4.00% 139 — — — 139 Greater than 4.00% — — — — — Total $ 859 $ — $ 1,624 $ 1 $ 2,484 Other policyholders' account balances March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 789 $ — $ 243 $ 533 $ 1,565 2.01% – 4.00% 378 613 — — 991 Greater than 4.00% — — — — — Total $ 1,167 $ 613 $ 243 $ 533 $ 2,556 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 446 $ — $ 212 $ 295 $ 953 2.01% – 4.00% 384 43 — — 427 Greater than 4.00% 5 — — — 5 Total $ 835 $ 43 $ 212 $ 295 $ 1,385 Separate accounts Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. The assets that support variable contracts are measured at fair value and are reported as Separate account assets and corresponding liabilities are reported within Separate account liabilities on the Consolidated balance sheets. Policy charges assessed against the policyholders for mortality, administration, and other services are included in Net premiums earned on the Consolidated statements of operations. The following table presents the aggregate fair value of Separate account assets, by major security type: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Cash and cash equivalents $ 76 $ 116 Mutual funds 5,699 5,082 Fixed maturities 89 102 Total $ 5,864 $ 5,300 The following table presents a roll-forward of separate account liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 5,573 $ 5,190 Premiums and deposits 264 266 Policy charges (43) (35) Surrenders and withdrawals (210) (111) Benefit payments (105) (99) Investment performance 375 110 Other (including foreign exchange) 10 (21) Balance – end of period $ 5,864 $ 5,300 Cash surrender value (1) $ 5,655 $ 5,030 (1) Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges. Unearned revenue liabilities Unearned revenue liabilities represent policy charges for services to be provided in future periods. The charges are reflected as deferred revenue and are generally amortized over the expected life of the contract using the same methodology, factors, and assumptions used to amortize deferred acquisition costs. Unearned revenue liabilities pertaining to both policyholders' account balances and separate accounts are recorded in Policyholders' account balances in the Consolidated balance sheets. The following table presents a roll-forward of unearned revenue liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 673 $ 567 Deferred revenue 34 32 Amortization (18) (14) Other (including foreign exchange) (9) — Balance – end of period $ 680 $ 585 Our reinsurance programs covering variable annuity guarantees, comprising guaranteed living benefits (GLB) and guaranteed minimum death benefits (GMDB), meet the definition of Market risk benefits (MRB). The following table presents a roll-forward of MRB: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 771 $ 800 Balance, beginning of period, before effect of changes in the instrument-specific credit risk 749 776 Interest rate changes (57) 63 Effect of changes in equity markets (77) (75) Effect of changes in volatilities (20) 57 Actual policyholder behavior different from expected behavior 30 (2) Effect of timing and all other (31) (16) Balance, end of period, before effect of changes in the instrument-specific credit risk $ 594 $ 803 Effect of changes in the instrument-specific credit risk 17 27 Balance – end of period $ 611 $ 830 Weighted-average age of policyholders (years) 74 73 Net amount at risk (1) $ 1,683 $ 2,296 (1) The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions. Excluded from the table above are MRB gains (losses) of $(134) million and $(89) million for the three months ended March 31, 2024 and 2023, respectively, reported in the Consolidated statements of operations, relating to the market risk benefits' economic hedge and other net cash flows. There is no reinsurance recoverable associated with our liability for MRB. For MRB, Chubb estimates fair value using an internal valuation model which includes a number of factors including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality. All reinsurance treaties contain claim limits, which are also factored into the valuation model. Valuation Technique Significant Unobservable Inputs March 31, 2024 March 31, 2023 Ranges Weighted Average (1) Ranges Weighted Average (1) MRB (1) Actuarial model Lapse rate 0.5% – 30.0% 4.3 % 0.5% – 30.4% 4.0 % Annuitization rate 0% – 100% 4.2 % 0% – 100% 4.4 % (1) The weighted-average lapse and annuitization rates are determined by weighting each treaty's rates by the MRB contract's fair value. The most significant policyholder behavior assumptions include lapse rates for MRBs, and GLB annuitization rates. Assumptions regarding lapse rates and GLB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable. A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease. The GLB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GLB. All else equal, as GLB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits.

Market risk benefits

Market risk benefits	3 Months Ended
	Mar. 31, 2024
Market Risk Benefit [Abstract]
Market Risk Benefits	Policyholders' account balances, Separate accounts, and Unearned revenue liabilities Policyholders' account balances The following tables present a roll-forward of policyholders' account balances: Three Months Ended March 31, 2024 (in millions of U.S. dollars) Universal Life Annuities (2) Other (3) Total Balance – beginning of period $ 1,876 $ 2,411 $ 2,502 $ 6,789 Premiums received 72 131 131 334 Policy charges (1) (34) — (2) (36) Surrenders and withdrawals (32) (10) (77) (119) Benefit payments (4) (54) (59) (3) (116) Interest credited 13 16 14 43 Other (including foreign exchange) (1) (5) (9) (15) Balance – end of period $ 1,840 $ 2,484 $ 2,556 $ 6,880 Unearned revenue liability 680 Policyholders' account liability, per consolidated balance sheet $ 7,560 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Relates to Huatai Life. (3) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (4) Includes benefit payments upon maturity as well as death benefits. Three Months Ended March 31, 2023 (in millions of U.S. dollars) Universal Life Other (2) Total Balance – beginning of period $ 1,199 $ 1,374 $ 2,573 Premiums received 50 18 68 Policy charges (1) (30) (4) (34) Surrenders and withdrawals (15) (8) (23) Benefit payments (3) (4) (6) (10) Interest credited 8 8 16 Other (including foreign exchange) — 3 3 Balance – end of period $ 1,208 $ 1,385 $ 2,593 Unearned revenue liability 585 Policyholders' account liability, per consolidated balance sheet $ 3,178 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (3) Includes benefit payments upon maturity as well as death benefits. March 31 2024 2023 (in millions of U.S. dollars, except for percentages) Universal Life Annuities Other Universal Life Other Weighted-average crediting rate 2.9 % 2.6 % 2.5 % 2.6 % 3.0 % Net amount at risk (1) $ 12,014 $ — $ 499 $ 11,394 $ 156 Cash Surrender Value $ 1,623 $ 1,605 $ 2,239 $ 1,005 $ 1,075 (1) For those guarantees of benefits that are payable in the event of death, the net amount at risk is defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date. The following tables present the balance of account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimum: Universal Life March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 482 $ — $ 39 $ 49 $ 570 2.01% – 4.00% 67 461 728 — 1,256 Greater than 4.00% 14 — — — 14 Total $ 563 $ 461 $ 767 $ 49 $ 1,840 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 455 $ — $ 32 $ 7 $ 494 2.01% – 4.00% 69 345 280 — 694 Greater than 4.00% 20 — — — 20 Total $ 544 $ 345 $ 312 $ 7 $ 1,208 Annuities March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 720 $ — $ 1,624 $ 1 $ 2,345 2.01% – 4.00% 139 — — — 139 Greater than 4.00% — — — — — Total $ 859 $ — $ 1,624 $ 1 $ 2,484 Other policyholders' account balances March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 789 $ — $ 243 $ 533 $ 1,565 2.01% – 4.00% 378 613 — — 991 Greater than 4.00% — — — — — Total $ 1,167 $ 613 $ 243 $ 533 $ 2,556 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 446 $ — $ 212 $ 295 $ 953 2.01% – 4.00% 384 43 — — 427 Greater than 4.00% 5 — — — 5 Total $ 835 $ 43 $ 212 $ 295 $ 1,385 Separate accounts Separate account assets represent segregated funds where investment risks are borne by the customers, except to the extent of certain guarantees made by Chubb. The assets that support variable contracts are measured at fair value and are reported as Separate account assets and corresponding liabilities are reported within Separate account liabilities on the Consolidated balance sheets. Policy charges assessed against the policyholders for mortality, administration, and other services are included in Net premiums earned on the Consolidated statements of operations. The following table presents the aggregate fair value of Separate account assets, by major security type: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Cash and cash equivalents $ 76 $ 116 Mutual funds 5,699 5,082 Fixed maturities 89 102 Total $ 5,864 $ 5,300 The following table presents a roll-forward of separate account liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 5,573 $ 5,190 Premiums and deposits 264 266 Policy charges (43) (35) Surrenders and withdrawals (210) (111) Benefit payments (105) (99) Investment performance 375 110 Other (including foreign exchange) 10 (21) Balance – end of period $ 5,864 $ 5,300 Cash surrender value (1) $ 5,655 $ 5,030 (1) Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges. Unearned revenue liabilities Unearned revenue liabilities represent policy charges for services to be provided in future periods. The charges are reflected as deferred revenue and are generally amortized over the expected life of the contract using the same methodology, factors, and assumptions used to amortize deferred acquisition costs. Unearned revenue liabilities pertaining to both policyholders' account balances and separate accounts are recorded in Policyholders' account balances in the Consolidated balance sheets. The following table presents a roll-forward of unearned revenue liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 673 $ 567 Deferred revenue 34 32 Amortization (18) (14) Other (including foreign exchange) (9) — Balance – end of period $ 680 $ 585 Our reinsurance programs covering variable annuity guarantees, comprising guaranteed living benefits (GLB) and guaranteed minimum death benefits (GMDB), meet the definition of Market risk benefits (MRB). The following table presents a roll-forward of MRB: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 771 $ 800 Balance, beginning of period, before effect of changes in the instrument-specific credit risk 749 776 Interest rate changes (57) 63 Effect of changes in equity markets (77) (75) Effect of changes in volatilities (20) 57 Actual policyholder behavior different from expected behavior 30 (2) Effect of timing and all other (31) (16) Balance, end of period, before effect of changes in the instrument-specific credit risk $ 594 $ 803 Effect of changes in the instrument-specific credit risk 17 27 Balance – end of period $ 611 $ 830 Weighted-average age of policyholders (years) 74 73 Net amount at risk (1) $ 1,683 $ 2,296 (1) The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions. Excluded from the table above are MRB gains (losses) of $(134) million and $(89) million for the three months ended March 31, 2024 and 2023, respectively, reported in the Consolidated statements of operations, relating to the market risk benefits' economic hedge and other net cash flows. There is no reinsurance recoverable associated with our liability for MRB. For MRB, Chubb estimates fair value using an internal valuation model which includes a number of factors including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality. All reinsurance treaties contain claim limits, which are also factored into the valuation model. Valuation Technique Significant Unobservable Inputs March 31, 2024 March 31, 2023 Ranges Weighted Average (1) Ranges Weighted Average (1) MRB (1) Actuarial model Lapse rate 0.5% – 30.0% 4.3 % 0.5% – 30.4% 4.0 % Annuitization rate 0% – 100% 4.2 % 0% – 100% 4.4 % (1) The weighted-average lapse and annuitization rates are determined by weighting each treaty's rates by the MRB contract's fair value. The most significant policyholder behavior assumptions include lapse rates for MRBs, and GLB annuitization rates. Assumptions regarding lapse rates and GLB annuitization rates differ by treaty, but the underlying methodologies to determine rates applied to each treaty are comparable. A lapse rate is the percentage of in-force policies surrendered in a given calendar year. All else equal, as lapse rates increase, ultimate claim payments will decrease. The GLB annuitization rate is the percentage of policies for which the policyholder will elect to annuitize using the guaranteed benefit provided under the GLB. All else equal, as GLB annuitization rates increase, ultimate claim payments will increase, subject to treaty claim limits.

Debt

Debt	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Debt Disclosure	DebtOn March 7, 2024, Chubb INA Holdings LLC (Chubb INA) issued $1.0 billion of 5.0 percent senior notes due March 2034. These senior unsecured notes are guaranteed on a senior basis by Chubb Limited and they rank equally with all of Chubb INA's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt. These senior notes are redeemable at any time at Chubb INA's option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable comparable government bond rate plus 0.15 percent). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund.

Commitments, contingencies, and

Commitments, contingencies, and guarantees	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments, contingencies, and guarantees	Commitments, contingencies, and guarantees a) Derivative instruments Chubb maintains positions in derivative instruments such as futures, options, swaps, and foreign currency forward contracts for which the primary purposes are to manage duration and foreign currency exposure, yield enhancement, or to obtain an exposure to a particular financial market. Chubb also maintains positions in convertible securities that contain embedded derivatives, and exchange-traded equity futures contracts on equity market indices to limit equity exposure in the market risk benefit (MRB) book of business. Investment derivative instruments, futures contracts on equities, and derivatives designated as hedges for accounting purposes are recorded in either Other assets (OA) or Accounts payable, accrued expenses, and other liabilities (AP); convertible bonds are recorded in Fixed maturities available-for-sale (FM AFS); and convertible equity securities are recorded in Equity securities (ES) in the Consolidated balance sheets. These are the most numerous and frequent derivative transactions. In addition, Chubb, from time to time, purchases to be announced mortgage-backed securities (TBAs) as part of its investing activities. As a global company, Chubb entities transact business in multiple currencies. Our policy is to generally match assets, liabilities, and required capital for each individual jurisdiction in local currency, which would include the use of derivatives discussed below. Some of Chubb's derivatives satisfy hedge accounting requirements, as discussed below. We also consider economic hedging for planned cross border transactions. The following table presents the balance sheet location, fair value of derivative instruments in an asset or (liability) position, and notional value/payment provision of our derivative instruments: March 31, 2024 December 31, 2023 Consolidated Fair Value Notional Fair Value Notional (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivatives not designated as hedging instruments: Foreign currency forward contracts OA / (AP) $ 23 $ (135) $ 3,647 $ 27 $ (94) $ 3,662 Options/Futures contracts on notes and bonds OA / (AP) 5 (9) 1,746 27 (42) 2,062 Convertible securities (1) FM AFS / ES 64 — 69 56 — 64 $ 92 $ (144) $ 5,462 $ 110 $ (136) $ 5,788 Other derivative instruments: Futures contracts on equities (2) OA / (AP) $ — $ (22) $ 1,162 $ — $ (37) $ 1,157 Other OA / (AP) 1 (6) 269 — (5) 217 $ 1 $ (28) $ 1,431 $ — $ (42) $ 1,374 Derivatives designated as hedging instruments: Cross-currency swaps - fair value hedges OA / (AP) $ 133 $ — $ 1,642 $ 126 $ — $ 1,631 Cross-currency swaps - net investment hedges OA / (AP) 16 (110) 1,625 10 (128) 1,619 $ 149 $ (110) $ 3,267 $ 136 $ (128) $ 3,250 (1) Includes fair value of embedded derivatives. (2) Related to MRB book of business. At March 31, 2024, and December 31, 2023, net derivative liabilities of $104 million and $115 million, respectively, included in the table above were subject to a master netting agreement. The remaining derivatives included in the table above were not subject to a master netting agreement. b) Hedge accounting We designate certain derivatives as fair value hedges and net investment hedges for accounting purposes to hedge for foreign currency exposure associated with portions of our euro denominated debt and the net investment in certain foreign subsidiaries, respectively. These derivatives comprise cross-currency swaps, which are agreements under which two counterparties exchange interest payments and principal denominated in different currencies at a future date. These hedges have been and are expected to be highly effective. (i) Cross-currency swaps - fair value hedges Chubb holds certain cross-currency swaps designated as fair value hedges. The objective of these cross-currency swaps is to hedge the foreign currency risk on €1.5 billion, or approximately $1.6 billion at March 31, 2024, of our euro denominated debt, by converting cash flows back into the U.S. dollar. These hedges are carried at fair value, with changes in fair value recorded in Other comprehensive income (OCI). The gains or losses on the fair value hedges offsetting the foreign currency remeasurement on the hedged euro denominated senior notes are reclassified from OCI into Net realized gains (losses), and an additional portion is reclassified into Interest expense, as follows: Three Months Ended March 31 (pre-tax, in millions of U.S. dollars) 2024 2023 Gain (loss) recognized in OCI $ (8) $ (17) Net realized gain (loss) reclassified from OCI (37) 20 Interest expense reclassified from OCI (4) (4) OCI gain (loss) after reclassifications $ 33 $ (33) (ii) Cross-currency swaps - net investment hedges Chubb holds certain cross-currency swaps designated as net investment hedges. The objective of these cross-currency swaps is to hedge the foreign currency exposure in the net investments of certain foreign subsidiaries by converting cash flows from U.S. dollar to the British pound sterling, Japanese yen, and Swiss franc. The hedged risk is designated as the foreign currency exposure arising between the functional currency of the foreign subsidiary and the functional currency of its parent entity. The mark-to-market adjustments for foreign currency changes will remain until the underlying hedge subsidiary is deconsolidated or if hedge accounting is discontinued. These net investment hedges are carried at fair value, with changes in fair value recorded in Cumulative translation adjustments (CTA) within OCI, and a portion is reclassified to Interest expense as follows: Three Months Ended March 31 (pre-tax, in millions of U.S. dollars) 2024 2023 Gain (loss) recognized in OCI $ 36 $ (23) Interest income reclassified from OCI 3 3 OCI gain (loss) after reclassifications $ 33 $ (26) c) Derivative instruments not designated as hedges Derivative instruments which are not designated as hedges are carried at fair value with changes in fair value recorded in Net realized gains (losses) or, for futures contracts on equities, related to the MRB book of business, in Market risk benefits gains (losses) in the Consolidated statements of operations. The following table presents net gains (losses) related to derivative instrument activity in the Consolidated statements of operations: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Investment and embedded derivative instruments: Foreign currency forward contracts $ (52) $ (51) All other futures contracts, options, and equities 6 5 Convertible securities (1) 3 — Total investment and embedded derivative instruments $ (43) $ (46) Other derivative instruments: Futures contracts on equities (2) (95) (57) Other (2) (1) Total other derivative instruments $ (97) $ (58) $ (140) $ (104) (1) Includes embedded derivatives. (2) Related to MRB book of business. (i) Foreign currency exposure management A foreign currency forward contract (forward) is an agreement between participants to exchange specific currencies at a future date. Chubb uses forwards to minimize the effect of fluctuating foreign currencies as discussed above. (ii) Duration management and market exposure Futures Futures contracts give the holder the right and obligation to participate in market movements, determined by the index or underlying security on which the futures contract is based. Settlement is made daily in cash by an amount equal to the change in value of the futures contract times a multiplier that scales the size of the contract. Exchange-traded futures contracts on money market instruments, notes and bonds are used in fixed maturity portfolios to more efficiently manage duration, as substitutes for ownership of the money market instruments, bonds, and notes without significantly increasing the risk in the portfolio. Investments in futures contracts may be made only to the extent that there are assets under management not otherwise committed. Exchange-traded equity futures contracts are used to limit exposure to a severe equity market decline, which would cause an increase in expected claims and, therefore, an increase in market risk benefit reserves. Options An option contract conveys to the holder the right, but not the obligation, to purchase or sell a specified amount or value of an underlying security at a fixed price. Option contracts are used in our investment portfolio as protection against unexpected shifts in interest rates, which would affect the duration of the fixed maturity portfolio. By using options in the portfolio, the overall interest rate sensitivity of the portfolio can be reduced. Option contracts may also be used as an alternative to futures contracts in the synthetic strategy as described above. The price of an option is influenced by the underlying security, level of interest rates, expected volatility, time to expiration, and supply and demand. The credit risk associated with the above derivative financial instruments relates to the potential for non-performance by counterparties. Although non-performance is not anticipated, in order to minimize the risk of loss, management monitors the creditworthiness of its counterparties and obtains collateral. The performance of exchange-traded instruments is guaranteed by the exchange on which they trade. For non-exchange-traded instruments, the counterparties are principally banks which must meet certain criteria according to our investment guidelines. Other Included within Other are derivatives intended to reduce potential losses which may arise from certain exposures in our insurance business. The economic benefit provided by these derivatives is similar to purchased reinsurance. For example, Chubb may, from time to time, enter into crop derivative contracts to protect underwriting results in the event of a significant decline in commodity prices. (iii) Convertible security investments A convertible security is a debt instrument or preferred stock that can be converted into a predetermined amount of the issuer’s equity. The convertible option is an embedded derivative within the host instruments which are classified in the investment portfolio as either available-for-sale or as an equity security. Chubb purchases convertible securities for their total return and not specifically for the conversion feature. (iv) TBA By acquiring TBAs, we make a commitment to purchase a future issuance of mortgage-backed securities. For the period between purchase of the TBAs and issuance of the underlying security, we account for our position as a derivative in the Consolidated Financial Statements. Chubb purchases TBAs, from time to time, both for their total return and for the flexibility they provide related to our mortgage-backed security strategy. (v) Futures contracts on equities Under the MRB program, as the assuming entity, Chubb is obligated to provide coverage until the expiration or maturity of the underlying deferred annuity contracts or the expiry of the reinsurance treaty. We may recognize a loss for changes in fair value due to adverse changes in the capital markets (e.g., declining interest rates and/or declining U.S. and/or international equity markets). To mitigate adverse changes in the capital markets, we maintain positions in exchange-traded equity futures contracts, as noted under section "(ii) Futures" above. These futures increase in fair value when the S&P 500 index decreases (and decrease in fair value when the S&P 500 index increases). The net impact of gains or losses related to changes in fair value of the MRB liability and the exchange-traded equity futures are included in Market risk benefits gains (losses) in the Consolidated statements of operations. d) Securities lending and secured borrowings Chubb participates in a securities lending program operated by a third-party banking institution whereby certain assets are loaned to qualified borrowers and from which we earn an incremental return. The securities lending collateral can only be drawn down by Chubb in the event that the institution borrowing the securities is in default under the lending agreement. An indemnification agreement with the lending agent protects us in the event a borrower becomes insolvent or fails to return any of the securities on loan. The collateral is recorded in Securities lending collateral and the liability is recorded in Securities lending payable in the Consolidated balance sheets. The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Overnight and Continuous Collateral held under securities lending agreements: Cash $ 698 $ 555 U.S. Treasury / Agency 275 33 Non-U.S. 654 621 Corporate and asset-backed securities 60 57 Municipal 4 6 Equity securities 17 27 $ 1,708 $ 1,299 Gross amount of recognized liability for securities lending payable $ 1,708 $ 1,299 At March 31, 2024, and December 31, 2023, our repurchase agreement obligations of $3,022 million and $2,833 million, respectively, were fully collateralized. In contrast to securities lending programs, the use of cash received is not restricted for the repurchase obligations. The fair value of the underlying securities sold remains in Fixed maturities available-for-sale or Other investments, and the repurchase agreement obligation is recorded in Repurchase agreements in the Consolidated balance sheets. The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2024 December 31, 2023 Up to 30 Days 30-90 Days Total Up to 30 Days 30-90 Days Greater than Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ 4 $ 4 $ — $ 33 $ 1 $ 34 Non-U.S. 1,579 — 1,579 1,355 — — 1,355 U.S. Treasury / Agency — 100 100 — 105 — 105 Mortgage-backed securities 488 926 1,414 — 913 517 1,430 $ 2,067 $ 1,030 $ 3,097 $ 1,355 $ 1,051 $ 518 $ 2,924 Gross amount of recognized liabilities for repurchase agreements $ 3,022 $ 2,833 Difference (1) $ 75 $ 91 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability. Potential risks exist in our secured borrowing transactions due to market conditions and counterparty exposure. With collateral that we pledge, there is a risk that the collateral may not be returned at the expiration of the agreement. If the counterparty fails to return the collateral, Chubb will have free use of the borrowed funds until our collateral is returned. In addition, we may encounter the risk that Chubb may not be able to renew outstanding borrowings with a new term or with an existing counterparty due to market conditions including a decrease in demand as well as more restrictive terms from banks due to increased regulatory and capital constraints. Should this condition occur, Chubb may seek alternative borrowing sources or reduce borrowings. Additionally, increased margins and collateral requirements due to market conditions would increase our restricted assets as we are required to provide additional collateral to support the transaction. e) Fixed maturities At March 31, 2024, and December 31, 2023, commitments to purchase fixed income securities over the next several years were $1.0 billion for both periods. f) Private equities Private equities in the Consolidated balance sheets are investments in limited partnerships and partially-owned investment companies with a carrying value of $14.0 billion at March 31, 2024. In connection with these investments, we have commitments that may require funding of up to $5.9 billion over the next several years. At December 31, 2023, these investments had a carrying value of $13.9 billion with commitments that could have required funding of up to $6.2 billion. g) Income taxes At March 31, 2024, $73 million of unrecognized tax benefits remain out standing. It is reasonably possible that, over the next twelve months, the amount of unrecognized tax benefits may change resulting from the re-evaluation of unrecognized tax benefits arising from examinations by taxing authorities, settlements, and the lapses of statutes of limitations. With few exceptions, Chubb is no longer subject to income tax examinations for years before 2012 . h) Legal proceedings Our insurance subsidiaries are subject to claims litigation involving disputed interpretations of policy coverages and, in some jurisdictions, direct actions by allegedly-injured persons seeking damages from policyholders. These lawsuits, involving claims on policies issued by our subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in our loss and loss expense reserves. In addition to claims litigation, we are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on insurance policies. This category of business litigation typically involves, among other things, allegations of underwriting errors or misconduct, employment claims, regulatory activity, or disputes arising from our business ventures. In the opinion of management, our ultimate liability for these matters could be, but we believe is not likely to be, material to our consolidated financial condition and results of operations. i) Lease commitments At March 31, 2024, and December 31, 2023, the right-of-use asset was $762 million and $784 million, respectively, recorded within Other assets Accounts payable, accrued expenses, and other liabilities

Shareholders' equity

Shareholders' equity	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Shareholders' equity	Shareholders’ equity All of Chubb’s Common Shares are authorized under Swiss corporate law. Though the par value of Common Shares is stated in Swiss francs, Chubb continues to use U.S. dollars as its reporting currency for preparing the Consolidated Financial Statements. Under Swiss corporate law, dividends, including distributions from legal reserves or through a reduction in par value (par value reduction), must be stated in Swiss francs though dividend payments are made by Chubb in U.S. dollars. At March 31, 2024, our Common Shares had a par value of CHF 0.50 per share. At our May 2023 and 2022 annual general meetings, our shareholders approved annual dividends for the following year of up to $3.44 per share and $3.32 per share, respectively, which were paid in four quarterly installments of $0.86 per share and $0.83 per share, respectively, at dates determined by the Board of Directors (Board) after the annual general meetings by way of a distribution from capital contribution reserves, transferred to free reserves for payment. Dividend distributions per Common Share for the three months ended March 31, 2024 and 2023, were $0.86 (CHF 0.75) and $0.83 (CHF 0.77), respectively. Increases in Common Shares in treasury are due to open market repurchases of Common Shares and the surrender of Common Shares to satisfy tax withholding obligations in connection with the vesting of restricted stock and the forfeiture of unvested restricted stock. Decreases in Common Shares in treasury are principally due to grants of restricted stock, exercises of stock options, purchases under the Employee Stock Purchase Plan (ESPP), and share cancellations. At our May 2023 annual general meeting, held on May 17, 2023, our shareholders approved the cancellation of 14,925,028 shares purchased under our share repurchase programs during 2022. The capital reduction was subject to publication requirements and became effective in accordance with Swiss law on May 22, 2023. During the three months ended March 31, 2024, 1,220,121 shares were repurchased and 1,983,550 net shares were issued under employee share-based compensation plans. At March 31, 2024, 25,418,520 Common Shares remain in treasury. Chubb Limited securities repurchase authorizations The Board has authorized share repurchase programs as follows: • $2.5 billion of Chubb Common Shares from May 19, 2022 through June 30, 2023; and • $5.0 billion of Chubb Common Shares effective July 1, 2023 with no expiration date. The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations: Three Months Ended April 1,2024 March 31 (in millions of U.S. dollars, except share data) 2024 2023 Number of shares repurchased 1,220,121 2,010,400 250,000 Cost of shares repurchased $ 316 $ 428 $ 62 Repurchase authorization remaining at end of period $ 3,373 $ 1,193 $ 3,312 The following table presents changes in accumulated other comprehensive income (loss): Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Accumulated other comprehensive income (loss) (AOCI) Net unrealized appreciation (depreciation) on investments Balance – beginning of period, net of tax $ (4,177) $ (7,279) Change in period, before reclassification from AOCI (before tax) (796) 1,606 Amounts reclassified from AOCI (before tax) 119 180 Change in period, before tax (677) 1,786 Income tax (expense) benefit 42 (166) Total other comprehensive income (loss) (635) 1,620 Noncontrolling interests, net of tax 13 — Balance – end of period, net of tax (4,825) (5,659) Current discount rate on liability for future policy benefits Balance – beginning of period, net of tax 51 (75) Change in period, before tax (53) (151) Income tax (expense) benefit (20) 21 Total other comprehensive loss (73) (130) Noncontrolling interests, net of tax (33) — Balance – end of period, net of tax 11 (205) Instrument-specific credit risk on market risk benefits Balance – beginning of period, net of tax (22) (24) Change in period, before and net of tax 5 (3) Total other comprehensive income (loss) 5 (3) Noncontrolling interests, net of tax — — Balance – end of period, net of tax (17) (27) Cumulative foreign currency translation adjustment Balance – beginning of period, net of tax (2,945) (2,966) Change in period, before reclassification from AOCI (before tax) 83 (174) Amounts reclassified from AOCI (before tax) (3) (3) Change in period, before tax 80 (177) Income tax (expense) benefit (7) 7 Total other comprehensive income (loss) 73 (170) Noncontrolling interests, net of tax (8) — Balance – end of period, net of tax (2,864) (3,136) Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Accumulated other comprehensive income (loss) (AOCI) - continued Fair value hedging instruments Balance – beginning of period, net of tax (13) (66) Change in period, before reclassification from AOCI (before tax) (8) (17) Amounts reclassified from AOCI (before tax) 41 (16) Change in period, before tax 33 (33) Income tax (expense) benefit (7) 7 Total other comprehensive income (loss) 26 (26) Noncontrolling interests, net of tax — — Balance – end of period, net of tax 13 (92) Postretirement benefit liability adjustment Balance – beginning of period, net of tax 297 225 Change in period, before tax (2) — Income tax (expense) benefit 1 (1) Total other comprehensive loss (1) (1) Noncontrolling interests, net of tax — — Balance – end of period, net of tax 296 224 Accumulated other comprehensive loss $ (7,386) $ (8,895) The following table presents reclassifications from accumulated other comprehensive income (loss) to the Consolidated statements of operations: Three Months Ended Consolidated Statement of Operations Location March 31 (in millions of U.S. dollars) 2024 2023 Fixed maturities available-for-sale $ (119) $ (180) Net realized gains (losses) Income tax benefit 12 18 Income tax expense $ (107) $ (162) Net income Cumulative foreign currency translation adjustment Cross-currency swaps $ 3 $ 3 Interest expense Income tax expense (1) (1) Income tax expense $ 2 $ 2 Net income Net gains (losses) of fair value hedging instruments Cross-currency swaps $ (37) $ 20 Net realized gains (losses) Cross-currency swaps (4) (4) Interest expense Income tax (expense) benefit 9 (3) Income tax expense $ (32) $ 13 Net income Total amounts reclassified from AOCI $ (137) $ (147)

Share-based compensation

Share-based compensation	3 Months Ended
	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share-based compensation	Share-based compensation The Chubb Limited 2016 Long-Term Incentive Plan, as amended and restated (the Amended 2016 LTIP), permits grants of both incentive and non-qualified stock options principally at an option price per share equal to the grant date fair value of Chubb's Common Shares. Stock options are generally granted with a 3-year vesting period and a 10-year term. Stock options typically vest in equal annual installments over the respective vesting period, which is also the requisite service period. On February 26, 2024, Chubb granted 1,359,237 stock options with a weighted-average grant date fair value of $64.15 each. The fair value of the options issued is estimated on the grant date using the Black-Scholes option pricing model. The Amended 2016 LTIP also permits grants of service-based restricted stock and restricted stock units as well as performance shares and performance stock units. Under the Chubb Deferred Stock Unit Plan, a sub-plan of the Amended 2016 LTIP, eligible participants may defer vested performance stock units and restricted stock units to the extent such awards are U.S.-allocated compensation.

Postretirement benefits

Postretirement benefits	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Postretirement benefits The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows: Pension Benefit Plans Other Postretirement 2024 2023 2024 2023 Three Months Ended March 31 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. Plans (in millions of U.S. dollars) Service cost $ — $ 2 $ — $ 2 $ — $ — Non-service cost (benefit): Interest cost 33 9 34 9 1 — Expected return on plan assets (61) (13) (56) (12) (1) (1) Amortization of net actuarial (gain) loss — 1 — — (1) — Amortization of prior service cost — — — — — — Settlements — — — — — — Total non-service cost (benefit) (28) (3) (22) (3) (1) (1) Net periodic benefit cost (benefit) $ (28) $ (1) $ (22) $ (1) $ (1) $ (1) The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows: Pension Benefit Plans Other Postretirement Three Months Ended March 31 2024 2023 2024 2023 (in millions of U.S. dollars) Service cost: Losses and loss expenses $ — $ — $ — $ — Administrative expenses 2 2 — — Total service cost 2 2 — — Non-service cost (benefit): Losses and loss expenses (3) (2) — — Administrative expenses (28) (23) (1) (1) Total non-service cost (benefit) (31) (25) (1) (1) Net periodic benefit cost (benefit) $ (29) $ (23) $ (1) $ (1)

Other Income and Expense

Other Income and Expense	3 Months Ended
	Mar. 31, 2024
Other Income and Expenses [Abstract]
Other Income and Expense Disclosure	Other income and expense Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Equity in net income (loss) of partially-owned entities $ 184 $ 340 Gains (losses) from fair value changes in separate account assets (1) 10 (25) Asset management and performance fee revenue 53 — Asset management and performance fee expense (33) — Federal excise and capital taxes (4) (5) Other (19) (14) Total $ 191 $ 296 (1) Related to gains (losses) from fair value changes in separate account assets that do not qualify for separate account reporting under U.S. GAAP. Equity in net income of partially-owned entities includes our share of net income or loss, both underlying operating income and mark-to-market movement, related to partially-owned investment companies (private equity) where we own more than three percent, and partially-owned insurance companies. This line item includes mark-to-market gains (losses) on private equities of $103 million and $242 million for the three months ended March 31, 2024 and 2023, respectively. In addition, this line item includes net income attributable to our investment in Huatai under the equity method of accounting comprising income of $14 million through March 31, 2023. Effective July 1, 2023, we discontinued the equity method of accounting and include the results of operations of Huatai in our consolidated results. Also included in Other income and expense are gains (losses) from fair value changes in separate account assets that do not qualify for separate account reporting under U.S. GAAP. The offsetting movement in the separate account liabilities is included in Policy benefits in the Consolidated statements of operations. Asset management and performance fee revenue and expense primarily relate to the management of third-party assets by Huatai's asset management business, which is unrelated to Huatai Group's core insurance operations. These revenues and expenses are recognized in the period in which the services are performed and, for certain asset performance fees, to the extent it is probable that a significant reversal will not occur. Certain federal excise and capital taxes incurred as a result of capital management initiatives are included in Other income and expense as these are considered capital transactions and are excluded from underwriting results. Bad debt expense for uncollectible premiums is also included in Other income and expense.

Segment information

Segment information	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment information	Segment information Chubb operates through six business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insuran ce, Overseas General Insurance, Global Reinsurance, and Life Insurance. These segments distribute their products through various forms of brokers, agencies, and direct marketing programs. All business segments have established relationships with reinsurance intermediar ies. Effective July 1, 2023, the results of Huatai's life and asset management businesses, included within the Life Insurance segment, and the results of Huatai's P&C insurance business, included within Overseas General Insurance, are presented gross within Underwriting income (loss), Net investment income (loss), and Other income (expense) as required under consolidation accounting. Huatai's results prior to July 1, 2023 were included net within Other (income) expense based on our ownership interest as required under equity method accounting. Management uses Underwriting income (loss) as the basis for segment performance. Chubb calculates Underwriting income (loss) by subtracting Losses and loss expenses, Policy benefits, Policy acquisition costs, and Administrative expenses from Net premiums earned. Segment income (loss) includes Underwriting income (loss), Net investment income (loss), and other operating income and expense items such as each segment's share of the operating income (loss) related to partially-owned entities and miscellaneous income and expense items for which the segments are held accountable. Our main measure of segment performance is Segment income (loss), which also includes Amortization of purchased intangibles acquired by the segment. We determined that this definition of Segment income (loss) is appropriate and aligns with how the business is managed. We continue to evaluate our segments as our business continues to evolve and may further refine our segments and Segment income (loss) measures. Revenue and expenses managed at the corporate level, including Net realized gains (losses), Market risk benefits gains (losses), Interest expense, Cigna integration expenses, Income tax expense, and Net income (loss) attributable to noncontrolling interests are reported within Corporate. Cigna integration expenses are one-time costs that are directly attributable to third-party consulting fees, employee-related retention costs, and other professional and legal fees primarily related to the acquisition of Cigna's business in Asia. These items are not allocated to the segment level as they are one-time in nature and are not related to the ongoing business activities of the segment. The Chief Executive Officer does not manage segment results or allocate resources to segments when considering these costs, and therefore are excluded from our definition of Segment income (loss). Certain items are presented in a different manner for segment reporting purposes than in the Consolidated Financial Statements. These items are reconciled to the consolidated presentation in the Segment measure reclass column below and include: • Losses and loss expenses include realized gains and losses on crop derivatives. These derivatives were purchased to provide economic benefit, in a manner similar to reinsurance protection, in the event that a significant decline in commodity pricing impacts underwriting results. We view gains and losses on these derivatives as part of the results of our underwriting operations, and therefore, realized gains (losses) from these derivatives are reclassified to losses and loss expenses. • Policy benefits include fair value changes on separate accounts that do not qualify for separate accounting under U.S. GAAP. These gains and losses have been reclassified from Other (income) expense. We view gains and losses from fair value changes in both separate account assets and liabilities as part of the results of our underwriting operations, and therefore these gains and losses are reclassified to Policy benefits. • Net investment income includes investment income reclassified from Other (income) expense related to partially-owned investment companies (private equity partnerships) where our ownership interest is in excess of three percent. We view investment income from these equity-method private equity partnerships as Net investment income for segment reporting purposes. The following tables present the Statement of Operations by segment: For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Life Insurance Corporate Segment Measure Reclass Chubb Consolidated Net premiums written $ 4,689 $ 1,456 $ 249 $ 3,835 $ 359 $ 1,633 $ — $ — $ 12,221 Net premiums earned 4,880 1,471 128 3,198 295 1,611 — — 11,583 Losses and loss expenses 3,175 899 49 1,426 137 32 10 (1) 5,727 Policy benefits — — — 100 — 1,070 — 10 1,180 Policy acquisition costs 688 300 21 823 81 294 — — 2,207 Administrative expenses 328 86 2 331 9 207 107 1,070 Underwriting income (loss) 689 186 56 518 68 8 (117) (9) 1,399 Net investment income 826 102 21 267 57 230 (26) (86) 1,391 Other (income) expense 7 1 — 5 — (40) (68) (96) (191) Amortization expense of — 2 6 20 — 10 42 — 80 Segment income (loss) $ 1,508 $ 285 $ 71 $ 760 $ 125 $ 268 $ (117) $ 1 $ 2,901 Net realized gains (losses) (100) (1) (101) Market risk benefits gains (losses) 21 — 21 Interest expense 178 — 178 Cigna integration expenses 7 — 7 Income tax expense 342 — 342 Net income (loss) (723) — 2,294 Net loss attributable to noncontrolling interests 151 — 151 Net income (loss) attributable to Chubb $ (874) $ — $ 2,143 For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Life Insurance Corporate Segment Measure Reclass Chubb Net premiums written $ 4,288 $ 1,296 $ 293 $ 3,263 $ 277 $ 1,293 $ — $ — $ 10,710 Net premiums earned 4,369 1,320 159 2,786 244 1,264 — — 10,142 Losses and loss expenses 2,729 888 140 1,237 112 32 11 (1) 5,148 Policy benefits — — — 110 — 712 — (25) 797 Policy acquisition costs 613 272 15 713 62 273 — — 1,948 Administrative expenses 295 79 3 280 9 167 97 — 930 Underwriting income (loss) 732 81 1 446 61 80 (108) 26 1,319 Net investment income 698 82 17 188 49 153 11 (91) 1,107 Other (income) expense 7 1 1 (9) (1) (15) (214) (66) (296) Amortization expense of — 2 6 18 — 4 42 — 72 Segment income $ 1,423 $ 160 $ 11 $ 625 $ 111 $ 244 $ 75 $ 1 $ 2,650 Net realized gains (losses) (76) (1) (77) Market risk benefits gains (losses) (115) — (115) Interest expense 160 — 160 Cigna integration expenses 22 — 22 Income tax expense 384 — 384 Net income (loss) $ (682) $ — $ 1,892 Underwriting assets are reviewed in total by management for purposes of decision-making. Other than certain insurance related balances, Goodwill and Other intangible assets, Chubb does not allocate assets to its segments.

Earnings per share

Earnings per share	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings per share	Earnings per share Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2024 2023 Numerator: Net income $ 2,294 $ 1,892 Net income attributable to noncontrolling interests 151 — Net income attributable to Chubb $ 2,143 $ 1,892 Denominator: Denominator for basic earnings per share attributable to Chubb: Weighted-average shares outstanding 405,662,694 414,289,150 Denominator for diluted earnings per share attributable to Chubb: Share-based compensation plans 4,076,941 3,639,042 Weighted-average shares outstanding and assumed conversions 409,739,635 417,928,192 Basic earnings per share attributable to Chubb $ 5.28 $ 4.57 Diluted earnings per share attributable to Chubb $ 5.23 $ 4.53 Potential anti-dilutive share conversions 1,005,420 1,731,523 Excluded from weighted-average shares outstanding and assumed conversions is the impact of securities that would have been anti-dilutive during the respective periods. These securities consisted of stock options in which the underlying exercise prices were greater than the average market prices of our Common Shares. Refer to Note 16 to the Consolidated Financial Statements of our 2023 Form 10-K for additional information on stock options.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income (loss)	$ 2,143	$ 1,892

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

General and significant accou_2

General and significant accounting policies (Policies)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation	Basis of presentation Chubb Limited is a holding company incorporated in Zurich, Switzerland. Chubb Limited, through its subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. Our results are reported through the following business segments: North America Commercial P&C Insurance, North America Personal P&C Insurance, North America Agricultural Insurance, Overseas General Insurance, Global Reinsurance, and Life Insurance. Refer to Note 17 for additional information. The interim unaudited consolidated financial statements include the accounts of Chubb Limited and its subsidiaries (collectively, Chubb, we, us, or our), over which Chubb exercises control, including Huatai Group, our majority-owned subsidiary, and minority-owned entities such as variable interest entities (VIEs) in which Chubb is considered the primary beneficiary. Noncontrolling interests on the Consolidated Financial Statements represent the portion of majority-owned subsidiaries and VIEs in which we do not have direct equity ownership. These interim unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and, in the opinion of management, reflect all adjustments necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions, including internal reinsurance transactions, have been eliminated. On July 1, 2023, Chubb discontinued equity method accounting for its investment in Huatai Group upon obtaining a controlling interest and applied consolidation accounting. Therefore, effective July 1, 2023, business activity for, and the financial position of, Huatai Group is reported at 100 percent on the Consolidated Financial Statements. At March 31, 2024, and December 31, 2023, our aggregate ownership interest in Huatai Group was approximately 85.5 percent and 76.5 percent, respectively. The relevant amounts attributable to shareholders other than Chubb are reflected in the Consolidated Financial Statements under the captions Noncontrolling interests, Net income (loss) attributable to noncontrolling interests, and Comprehensive income (loss) attributable to noncontrolling interests. Refer to Note 2 for additional information on the acquisition of Huatai Group. Huatai Group's life insurance and asset management businesses are included in the Life Insurance segment, and Huatai Group's P&C business is included in the Overseas General Insurance segment. Results for Huatai Group's non-insurance operations, comprising real estate and holding company activity, are included in Corporate. The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our 2023 Form 10-K.
Goodwill and Intangible Assets, Goodwill, Policy	GoodwillDuring the three months ended March 31, 2024, Goodwill increased $10 million, primarily reflecting the impact of foreign exchange.
Accounting guidance adopted in current year	New Accounting Pronouncements Improvements to Reportable Segment Disclosures In November 2023, the Financial Accounting Standards Board (FASB) issued guidance that requires expanded reportable segment disclosures, primarily related to significant segment expenses which are regularly provided to the chief operating decision maker. The guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within annual periods beginning after December 15, 2024. Retrospective application is required. We are currently evaluating the impact of this disclosure-only requirement. Improvements to Income Tax Disclosures In December 2023, the FASB issued guidance that requires expanded income tax disclosures, including the disaggregation of existing disclosures related to the tax rate reconciliation and income taxes paid. The guidance is effective for annual periods beginning after December 15, 2024. Prospective application is required, with retrospective application permitted. We are currently evaluating the impact of this disclosure-only requirement.

Fair value measurements (Fair V

Fair value measurements (Fair Value Measurement Policy) (Policies)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurement, Policy	Fair value of financial assets and financial liabilities is estimated based on the framework established in the fair value accounting guidance. The guidance defines fair value as the price to sell an asset or transfer a liability (an exit price) in an orderly transaction between market participants and establishes a three-level valuation hierarchy based on the reliability of the inputs. The fair value hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. The three levels of the hierarchy are as follows: • Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets; • Level 2 – Includes, among other items, inputs other than quoted prices that are observable for the asset or liability such as interest rates and yield curves, quoted prices for similar assets and liabilities in active markets, and quoted prices for identical or similar assets and liabilities in markets that are not active; and • Level 3 – Inputs that are unobservable and reflect management’s judgments about assumptions that market participants would use in pricing an asset or liability.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2024
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information	The following table presents supplemental unaudited pro forma consolidated information for the periods indicated as though the acquisition of a controlling majority interest in Huatai Group that occurred on July 1, 2023, had instead occurred on January 1, 2022. The unaudited pro forma consolidated financial information is presented for informational purposes only and is not necessarily indicative of the operating results that would have occurred had the acquisition of a controlling majority interest been consummated on January 1, 2022, nor is it necessarily indicative of future operating results. Significant assumptions used to determine pro forma operating results include amortization of VOBA and other intangible assets. Three Months Ended Pro forma: March 31 (in millions of U.S. dollars) 2023 Net premiums earned $ 10,553 Total revenues $ 11,529 Net income $ 1,900 Net income attributable to Chubb $ 1,890

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities	March 31, 2024 Amortized Valuation Allowance Gross Gross Fair Value (in millions of U.S. dollars) Available-for-sale U.S. Treasury / Agency $ 3,058 $ — $ 5 $ (164) $ 2,899 Non-U.S. 36,962 (41) 605 (1,381) 36,145 Corporate and asset-backed securities 45,567 (73) 306 (2,353) 43,447 Mortgage-backed securities 25,696 (1) 89 (2,029) 23,755 Municipal 2,196 — 7 (160) 2,043 $ 113,479 $ (115) $ 1,012 $ (6,087) $ 108,289 December 31, 2023 Amortized Valuation Allowance Gross Gross Fair Value (in millions of U.S. dollars) Available-for-sale U.S. Treasury / Agency $ 3,721 $ — $ 13 $ (144) $ 3,590 Non-U.S. 35,918 (49) 592 (1,297) 35,164 Corporate and asset-backed securities 44,695 (104) 390 (2,151) 42,830 Mortgage-backed securities 23,720 (3) 143 (1,802) 22,058 Municipal 3,074 — 10 (155) 2,929 $ 111,128 $ (156) $ 1,148 $ (5,549) $ 106,571
Schedule Of Fixed Maturities By Contractual Maturity	The following table presents fixed maturities by contractual maturity: March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Net Carrying Value Fair Value Net Carrying Value Fair Value Available-for-sale Due in 1 year or less $ 4,521 $ 4,521 $ 4,729 $ 4,729 Due after 1 year through 5 years 33,533 33,533 33,573 33,573 Due after 5 years through 10 years 28,198 28,198 28,480 28,480 Due after 10 years 18,282 18,282 17,731 17,731 84,534 84,534 84,513 84,513 Mortgage-backed securities 23,755 23,755 22,058 22,058 $ 108,289 $ 108,289 $ 106,571 $ 106,571
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position	The following tables present, for available-for-sale (AFS) fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have expected credit losses, the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position: 0 – 12 Months Over 12 Months Total March 31, 2024 Fair Value Gross Fair Value Gross Fair Value Gross (in millions of U.S. dollars) U.S. Treasury / Agency $ 632 $ (13) $ 2,007 $ (151) $ 2,639 $ (164) Non-U.S. 3,793 (64) 15,928 (1,079) 19,721 (1,143) Corporate and asset-backed securities 4,675 (71) 19,646 (1,487) 24,321 (1,558) Mortgage-backed securities 4,907 (82) 13,783 (1,919) 18,690 (2,001) Municipal 443 (12) 1,218 (148) 1,661 (160) Total AFS fixed maturities $ 14,450 $ (242) $ 52,582 $ (4,784) $ 67,032 $ (5,026) 0 – 12 Months Over 12 Months Total December 31, 2023 Fair Value Gross Fair Value Gross Fair Value Gross (in millions of U.S. dollars) U.S. Treasury / Agency $ 463 $ (9) $ 2,504 $ (135) $ 2,967 $ (144) Non-U.S. 2,464 (43) 15,971 (957) 18,435 (1,000) Corporate and asset-backed securities 2,866 (51) 20,334 (1,194) 23,200 (1,245) Mortgage-backed securities 1,659 (58) 13,831 (1,706) 15,490 (1,764) Municipal 1,117 (15) 1,310 (137) 2,427 (152) Total AFS fixed maturities $ 8,569 $ (176) $ 53,950 $ (4,129) $ 62,519 $ (4,305)
Debt Securities, Available-for-sale, Allowance for Credit Loss	The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Available-for-sale Valuation allowance for expected credit losses - beginning of period $ 156 $ 169 Provision for expected credit loss 31 59 Write-offs charged against the expected credit loss (5) (2) Recovery of expected credit loss (67) (58) Valuation allowance for expected credit losses - end of period $ 115 $ 168 Held-to-maturity Valuation allowance for expected credit losses - beginning of period $ — $ 34 Recovery of expected credit loss — (1) Valuation allowance for expected credit losses - end of period $ — $ 33 Private debt held-for-investment Valuation allowance for expected credit losses - beginning of period $ 4 $ — Provision for expected credit loss 1 — Valuation allowance for expected credit losses - end of period $ 5 $ —
Debt Securities, Held-to-maturity, Allowance for Credit Loss	The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Available-for-sale Valuation allowance for expected credit losses - beginning of period $ 156 $ 169 Provision for expected credit loss 31 59 Write-offs charged against the expected credit loss (5) (2) Recovery of expected credit loss (67) (58) Valuation allowance for expected credit losses - end of period $ 115 $ 168 Held-to-maturity Valuation allowance for expected credit losses - beginning of period $ — $ 34 Recovery of expected credit loss — (1) Valuation allowance for expected credit losses - end of period $ — $ 33 Private debt held-for-investment Valuation allowance for expected credit losses - beginning of period $ 4 $ — Provision for expected credit loss 1 — Valuation allowance for expected credit losses - end of period $ 5 $ —
Private debt held-for-investment, allowance for credit loss	The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Available-for-sale Valuation allowance for expected credit losses - beginning of period $ 156 $ 169 Provision for expected credit loss 31 59 Write-offs charged against the expected credit loss (5) (2) Recovery of expected credit loss (67) (58) Valuation allowance for expected credit losses - end of period $ 115 $ 168 Held-to-maturity Valuation allowance for expected credit losses - beginning of period $ — $ 34 Recovery of expected credit loss — (1) Valuation allowance for expected credit losses - end of period $ — $ 33 Private debt held-for-investment Valuation allowance for expected credit losses - beginning of period $ 4 $ — Provision for expected credit loss 1 — Valuation allowance for expected credit losses - end of period $ 5 $ —
Schedule of Realized Gain (Loss)	The following table presents the components of net realized gains (losses): Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Fixed maturities: Gross realized gains $ 16 $ 2 Gross realized losses (141) (159) Other investments - Fixed maturities 168 — Net (provision for) recovery of expected credit losses 40 2 Impairment (1) (34) (25) Total fixed maturities 49 (180) Equity securities 3 11 Private equities (less than 3 percent ownership) 31 15 Foreign exchange (131) 131 Investment and embedded derivative instruments (43) (46) Other derivative instruments (2) (1) Other (8) (7) Net realized gains (losses) (pre-tax) $ (101) $ (77) (1) Relates to certain securities we intended to sell and securities written to market entering default.
Gain (Loss) on Securities	Realized gains and losses from Other investments, Equity securities and Private equities from the table above include sales of securities and unrealized gains and losses from fair value changes as follows: Three Months Ended March 31 2024 2023 (in millions of U.S. dollars) Equity Securities Other Investments Private Equities Total Equity Securities Private Equities Total Net gains (losses) recognized during the period $ 3 $ 168 $ 31 $ 202 $ 11 $ 15 $ 26 Less: Net gains (losses) recognized from sales of securities (3) — — (3) (5) — (5) Unrealized gains (losses) recognized for securities still held at reporting date $ 6 $ 168 $ 31 $ 205 $ 16 $ 15 $ 31
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share	Expected March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Fair Maximum Fair Maximum Financial 2 to 10 Years $ 1,289 $ 341 $ 1,241 $ 364 Real assets 2 to 13 Years 2,095 424 2,137 445 Distressed 2 to 8 Years 1,218 928 1,206 936 Private credit 3 to 8 Years 328 296 331 298 Traditional 2 to 14 Years 9,052 3,916 8,873 4,167 Vintage 1 to 3 Years 67 — 72 — Investment funds Not Applicable 232 — 218 — $ 14,281 $ 5,905 $ 14,078 $ 6,210
Schedule Of Components Of Restricted Assets	The following table presents the components of restricted assets: March 31 December 31 (in millions of U.S. dollars) 2024 2023 Trust funds $ 8,626 $ 8,482 Deposits with U.S. regulatory authorities 2,488 2,544 Deposits with non-U.S. regulatory authorities 3,595 3,584 Assets pledged under repurchase agreements 3,097 2,924 Other pledged assets 905 880 Total $ 18,711 $ 18,414

Fair value measurements (Tables

Fair value measurements (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Financial Instruments Measured At Fair Value On A Recurring Basis	Financial instruments measured at fair value on a recurring basis, by valuation hierarchy March 31, 2024 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available-for-sale U.S. Treasury / Agency $ 2,251 $ 648 $ — $ 2,899 Non-U.S. — 35,427 718 36,145 Corporate and asset-backed securities — 40,789 2,658 43,447 Mortgage-backed securities — 23,748 7 23,755 Municipal — 2,043 — 2,043 2,251 102,655 3,383 108,289 Equity securities 3,668 — 101 3,769 Short-term investments 3,292 1,810 5 5,107 Other investments (1) 583 4,897 — 5,480 Securities lending collateral — 1,708 — 1,708 Investment derivatives 28 — — 28 Derivatives designated as hedging instruments — 149 — 149 Other derivative instruments 1 — — 1 Separate account assets 5,775 89 — 5,864 Total assets measured at fair value (1)(2) $ 15,598 $ 111,308 $ 3,489 $ 130,395 Liabilities: Investment derivatives $ 144 $ — $ — $ 144 Derivatives designated as hedging instruments — 110 — 110 Other derivative instruments 22 6 — 28 Market risk benefits (3) — — 611 611 Total liabilities measured at fair value $ 166 $ 116 $ 611 $ 893 (1) Excluded from the table above are other investments of $736 million, principally policy loans at March 31, 2024, measured using NAV as a practical expedient. (2) Excluded from the table above are Private equities of $14,281 million at March 31, 2024, measured using NAV as a practical expedient. (3) Refer to Note 10 for additional information on Market risk benefits. December 31, 2023 Level 1 Level 2 Level 3 Total (in millions of U.S. dollars) Assets: Fixed maturities available-for-sale U.S. Treasury / Agency $ 2,911 $ 679 $ — $ 3,590 Non-U.S. — 34,472 692 35,164 Corporate and asset-backed securities — 40,208 2,622 42,830 Mortgage-backed securities — 22,051 7 22,058 Municipal — 2,929 — 2,929 2,911 100,339 3,321 106,571 Equity securities 3,368 — 87 3,455 Short-term investments 1,915 2,633 3 4,551 Other investments (1) 589 4,236 — 4,825 Securities lending collateral — 1,299 — 1,299 Investment derivatives 54 — — 54 Derivatives designated as hedging instruments — 136 — 136 Separate account assets 5,482 91 — 5,573 Total assets measured at fair value (1)(2) $ 14,319 $ 108,734 $ 3,411 $ 126,464 Liabilities: Investment derivatives $ 136 $ — $ — $ 136 Derivatives designated as hedging instruments — 128 — 128 Other derivative instruments 37 5 — 42 Market risk benefits (3) — — 771 771 Total liabilities measured at fair value $ 173 $ 133 $ 771 $ 1,077 (1) Excluded from the table above are other investments of $702 million, principally policy loans at December 31, 2023, measured using NAV as a practical expedient. (2) Excluded from the table above are Private equities of $14,078 million at December 31, 2023, measured using NAV as a practical expedient. (3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3). Three Months Ended Available-for-Sale Debt Securities Equity Short-term investments Non-U.S. Corporate and asset- Mortgage-backed securities Balance, beginning of period $ 692 $ 2,622 $ 7 $ 87 $ 3 Transfers into Level 3 1 1 — — — Transfers out of Level 3 (4) (3) — — — Change in Net Unrealized Gains (Losses) in OCI 14 6 — — — Net Realized Gains (Losses) — — — (3) — Purchases 72 143 — 18 4 Sales (20) (20) — (1) — Settlements (37) (91) — — (2) Balance, end of period $ 718 $ 2,658 $ 7 $ 101 $ 5 Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date $ — $ — $ — $ (2) $ — Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date $ 13 $ 6 $ — $ — $ — Three Months Ended Available-for-Sale Debt Securities Equity Short-term investments Non-U.S. Corporate and asset- Mortgage-backed securities Balance, beginning of period $ 564 $ 2,449 $ 11 $ 90 $ 3 Transfers out of Level 3 — (11) — — — Change in Net Unrealized Gains (Losses) in OCI (4) (2) — — (1) Net Realized Gains (Losses) — 2 — (4) — Purchases 43 205 — 7 5 Sales (31) (20) — (5) — Settlements (11) (79) (1) — — Balance, end of period $ 561 $ 2,544 $ 10 $ 88 $ 7 Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date $ — $ 4 $ — $ (3) $ — Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date $ (6) $ (5) $ — $ — $ (1)
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value	The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value: March 31, 2024 Fair Value Net Carrying (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Private debt held-for-investment $ — $ — $ 2,733 $ 2,733 $ 2,708 Total assets $ — $ — $ 2,733 $ 2,733 $ 2,708 Liabilities: Repurchase agreements $ — $ 3,022 $ — $ 3,022 $ 3,022 Short-term debt — 2,228 — 2,228 2,265 Long-term debt — 11,930 — 11,930 13,248 Trust preferred securities — 365 — 365 309 Total liabilities $ — $ 17,545 $ — $ 17,545 $ 18,844 December 31, 2023 Fair Value Net Carrying (in millions of U.S. dollars) Level 1 Level 2 Level 3 Total Assets: Private debt held-for-investment $ — $ — $ 2,560 $ 2,560 $ 2,553 Total assets $ — $ — $ 2,560 $ 2,560 $ 2,553 Liabilities: Repurchase agreements $ — $ 2,833 $ — $ 2,833 $ 2,833 Short-term debt — 1,431 — 1,431 1,460 Long-term debt — 11,924 — 11,924 13,035 Trust preferred securities — 365 — 365 308 Total liabilities $ — $ 16,553 $ — $ 16,553 $ 17,636

Reinsurance (Tables)

Reinsurance (Tables)	3 Months Ended
	Mar. 31, 2024
Reinsurance Disclosures [Abstract]
schedule of reinsurance recoverable on ceded insurance	March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Net Reinsurance Recoverable (1) Valuation allowance Net Reinsurance Recoverable (1) Valuation allowance Reinsurance recoverable on unpaid losses and loss expenses $ 17,163 $ 290 $ 17,884 $ 285 Reinsurance recoverable on paid losses and loss expenses 1,946 85 2,068 82 Reinsurance recoverable on losses and loss expenses $ 19,109 $ 375 $ 19,952 $ 367 Reinsurance recoverable on policy benefits $ 272 $ — $ 280 $ — (1) Net of valuation allowance for uncollectible reinsurance.
Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]	The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Valuation allowance for uncollectible reinsurance - beginning of period $ 367 $ 351 Provision for uncollectible reinsurance 8 5 Write-offs charged against the valuation allowance — (5) Valuation allowance for uncollectible reinsurance - end of period $ 375 $ 351

Deferred acquisition costs (Tab

Deferred acquisition costs (Tables)	3 Months Ended
	Mar. 31, 2024
Deferred Policy Acquisition Costs Disclosures [Abstract]
Deferred Policy Acquisition Costs	The following tables present a roll-forward of deferred acquisitions costs on long-duration contracts included in the Life Insurance segment: Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Universal Life Whole Life A&H Other Total Balance – beginning of period $ 402 $ 674 $ 534 $ 1,301 $ 274 $ 3,185 Capitalizations 47 33 85 158 16 339 Amortization expense (28) (20) (8) (41) (7) (104) Other (including foreign exchange) (8) 1 (3) 3 (2) (9) Balance - end of period $ 413 $ 688 $ 608 $ 1,421 $ 281 $ 3,411 Overseas General Insurance segment excluded from table 616 Total deferred acquisition costs on long-duration contracts $ 4,027 Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Universal Life Whole Life A&H Other Total Balance – beginning of period $ 324 $ 639 $ 392 $ 891 $ 268 $ 2,514 Capitalizations 42 25 28 123 4 222 Amortization expense (24) (19) (5) (30) (6) (84) Other (including foreign exchange) 7 (1) 9 (15) (1) (1) Balance - end of period $ 349 $ 644 $ 424 $ 969 $ 265 $ 2,651 Overseas General Insurance segment excluded from table 642 Total deferred acquisition costs on long-duration contracts $ 3,293

Unpaid losses and loss expens_2

Unpaid losses and loss expenses (Tables)	3 Months Ended
	Mar. 31, 2024
Liability for Claims and Claims Adjustment Expense [Abstract]
Schedule of Unpaid Losses And Loss Expenses Roll Forward [Table Text Block]	The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Gross unpaid losses and loss expenses – beginning of period $ 80,122 $ 75,747 Reinsurance recoverable on unpaid losses – beginning of period (1) (17,884) (17,086) Net unpaid losses and loss expenses – beginning of period 62,238 58,661 Net losses and loss expenses incurred in respect of losses occurring in: Current year 5,980 5,336 Prior years (2) (253) (188) Total 5,727 5,148 Net losses and loss expenses paid in respect of losses occurring in: Current year 767 805 Prior years 4,055 3,911 Total 4,822 4,716 Foreign currency revaluation and other 35 (196) Net unpaid losses and loss expenses – end of period 63,178 58,897 Reinsurance recoverable on unpaid losses (1) 17,163 16,520 Gross unpaid losses and loss expenses – end of period $ 80,341 $ 75,417 (1) Net of valuation allowance for uncollectible reinsurance. (2) Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and A&H long-duration lines totaling $46 million and $(8) million for the three months ended March 31, 2024 and 2023, respectively.
Prior Period Development, by Segment [Table Text Block]	The following table summarizes (favorable) and adverse PPD by segment: Three Months Ended March 31 (in millions of U.S. dollars) Long-tail Short-tail Total 2024 North America Commercial P&C Insurance $ 96 $ (144) $ (48) North America Personal P&C Insurance — (52) (52) North America Agricultural Insurance — (28) (28) Overseas General Insurance (1) (88) (89) Global Reinsurance — 1 1 Corporate 9 — 9 Total $ 104 $ (311) $ (207) 2023 North America Commercial P&C Insurance $ 9 $ (81) $ (72) North America Personal P&C Insurance — 17 17 North America Agricultural Insurance — — — Overseas General Insurance — (143) (143) Global Reinsurance — (8) (8) Corporate 10 — 10 Total $ 19 $ (215) $ (196)

Future policy benefits (Tables)

Future policy benefits (Tables)	3 Months Ended
	Mar. 31, 2024
Liability for Future Policy Benefits Activity [Abstract]
Liability for Future Policy Benefit, Activity	The following tables present a roll-forward of the liability for future policy benefits included in the Life Insurance segment: Present Value of Expected Net Premiums Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,590 $ 3,950 $ 10,432 $ 64 $ 16,036 Beginning balance at original discount rate 1,992 3,945 10,692 64 16,693 Effect of changes in cash flow assumptions 6 70 109 — 185 Effect of actual variances from expected experience (1) 22 (37) — (16) Adjusted beginning of period balance 1,997 4,037 10,764 64 16,862 Issuances 65 295 697 2 1,059 Interest accrual 14 27 133 — 174 Net premiums collected (1) (57) (310) (363) (7) (737) Other (including foreign exchange) (5) (4) 82 — 73 Ending balance at original discount rate 2,014 4,045 11,313 59 17,431 Effect of changes in discount rate assumptions (407) 18 (295) — (684) Balance – end of period $ 1,607 $ 4,063 $ 11,018 $ 59 $ 16,747 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,254 $ 10,063 $ 14,650 $ 495 $ 27,462 Beginning balance at original discount rate 2,749 9,991 15,071 492 28,303 Effect of changes in cash flow assumptions 8 86 100 — 194 Effect of actual variances from expected experience 3 27 (36) — (6) Adjusted beginning of period balance 2,760 10,104 15,135 492 28,491 Issuances 65 295 697 2 1,059 Interest accrual 19 74 164 3 260 Benefits payments (59) (87) (398) (6) (550) Other (including foreign exchange) 30 (2) 114 21 163 Ending balance at original discount rate 2,815 10,384 15,712 512 29,423 Effect of changes in discount rate assumptions (516) 184 (487) 18 (801) Balance – end of period $ 2,299 $ 10,568 $ 15,225 $ 530 $ 28,622 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2024 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 692 $ 6,505 $ 4,207 $ 471 $ 11,875 Deferred profit liability 254 904 174 19 1,351 Net liability for future policy benefits, before reinsurance recoverable 946 7,409 4,381 490 13,226 Less: Reinsurance recoverable on future policy benefits 107 45 113 1 266 Net liability for future policy benefits, after reinsurance recoverable $ 839 $ 7,364 $ 4,268 $ 489 $ 12,960 Weighted average duration (years) 10.2 25.6 10.1 15.1 19.3 Present Value of Expected Net Premiums Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 1,806 $ 2,308 $ 10,711 $ 42 $ 14,867 Beginning balance at original discount rate 1,867 2,361 11,258 43 15,529 Effect of changes in cash flow assumptions 17 (1) (786) 1 (769) Effect of actual variances from expected experience (6) (8) (89) (1) (104) Adjusted beginning of period balance 1,878 2,352 10,383 43 14,656 Issuances 36 69 288 1 394 Interest accrual 28 18 125 — 171 Net premiums collected (1) (44) (82) (327) (6) (459) Other (including foreign exchange) 35 8 (139) 1 (95) Ending balance at original discount rate 1,933 2,365 10,330 39 14,667 Effect of changes in discount rate assumptions (48) (8) (263) — (319) Balance – end of period $ 1,885 $ 2,357 $ 10,067 $ 39 $ 14,348 (1) Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit. Present Value of Expected Future Policy Benefits Three Months Ended March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Balance – beginning of period $ 2,321 $ 5,696 $ 15,038 $ 269 $ 23,324 Beginning balance at original discount rate 2,447 5,874 15,855 280 24,456 Effect of changes in cash flow assumptions 20 (1) (798) 3 (776) Effect of actual variances from expected experience (3) (7) (87) (1) (98) Adjusted beginning of period balance 2,464 5,866 14,970 282 23,582 Issuances 36 69 288 1 394 Interest accrual 32 52 156 2 242 Benefit payments (46) (65) (362) (3) (476) Other (including foreign exchange) 72 28 (153) (14) (67) Ending balance at original discount rate 2,558 5,950 14,899 268 23,675 Effect of changes in discount rate assumptions (118) (42) (463) — (623) Balance – end of period $ 2,440 $ 5,908 $ 14,436 $ 268 $ 23,052 Liability for Future Policy Benefits, Life Insurance Segment March 31, 2023 (in millions of U.S. dollars) Term Life Whole Life A&H Other Total Net liability for future policy benefits $ 555 $ 3,551 $ 4,369 $ 229 $ 8,704 Deferred profit liability 223 581 135 13 952 Net liability for future policy benefits, before reinsurance recoverable 778 4,132 4,504 242 9,656 Less: Reinsurance recoverable on future policy benefits 105 33 112 — 250 Net liability for future policy benefits, after reinsurance recoverable $ 673 $ 4,099 $ 4,392 $ 242 $ 9,406 Weighted average duration (years) 9.4 25.3 10.7 14.5 17.7 The following table presents a reconciliation of the roll-forwards above to the Future policy benefits liability presented in the Consolidated balance sheets. March 31 (in millions of U.S. dollars) 2024 2023 Net liability for future policy benefits, Life Insurance segment $ 11,875 $ 8,704 Other (1) 1,149 1,126 Deferred profit liability 1,351 952 Liability for future policy benefits, per consolidated balance sheet $ 14,375 $ 10,782 (1) Other business principally comprises certain Overseas General Insurance accident and health (A&H) policies and certain Chubb Life Re business. The following table presents the amount of undiscounted and discounted expected gross premiums and expected future policy benefit payments included in the Life Insurance segment: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Term Life Undiscounted expected future benefit payments $ 4,358 $ 4,041 Undiscounted expected future gross premiums 7,291 6,452 Discounted expected future benefit payments 2,299 2,440 Discounted expected future gross premiums 3,909 3,773 Whole Life Undiscounted expected future benefit payments 24,834 16,446 Undiscounted expected future gross premiums 9,593 6,895 Discounted expected future benefit payments 10,568 5,908 Discounted expected future gross premiums 7,774 5,398 A&H Undiscounted expected future benefit payments 26,475 23,186 Undiscounted expected future gross premiums 39,002 33,809 Discounted expected future benefit payments 15,225 14,436 Discounted expected future gross premiums 22,975 20,766 Other Undiscounted expected future benefit payments 901 342 Undiscounted expected future gross premiums 94 97 Discounted expected future benefit payments 530 268 Discounted expected future gross premiums $ 83 $ 87 The following table presents the amount of revenue and interest recognized in the Consolidated statement of operations for the Life Insurance segment: Gross Premiums or Assessments Interest Accretion Three Months Ended Three Months Ended March 31 March 31 (in millions of U.S. dollars) 2024 2023 2024 2023 Life Insurance Term Life $ 167 $ 160 $ 5 $ 4 Whole Life 530 230 47 34 A&H 753 733 31 31 Other 20 17 3 2 Total $ 1,470 $ 1,140 $ 86 $ 71 The following table presents the weighted-average interest rates for the Life Insurance segment: Interest Accretion Rate Current Discount Rate March 31 March 31 2024 2023 2024 2023 Life Insurance Term Life 2.9 % 2.8 % 5.7 % 5.7 % Whole Life 3.2 % 4.0 % 4.5 % 5.2 % A&H 3.7 % 3.8 % 6.3 % 6.2 % Other 2.6 % 3.8 % 3.8 % 4.8 %

Policyholders' account balanc_2

Policyholders' account balances, Separate accounts, and Unearned revenue liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Policyholder Account Balance [Abstract]
Policyholder Account Balances	Policyholders' account balances The following tables present a roll-forward of policyholders' account balances: Three Months Ended March 31, 2024 (in millions of U.S. dollars) Universal Life Annuities (2) Other (3) Total Balance – beginning of period $ 1,876 $ 2,411 $ 2,502 $ 6,789 Premiums received 72 131 131 334 Policy charges (1) (34) — (2) (36) Surrenders and withdrawals (32) (10) (77) (119) Benefit payments (4) (54) (59) (3) (116) Interest credited 13 16 14 43 Other (including foreign exchange) (1) (5) (9) (15) Balance – end of period $ 1,840 $ 2,484 $ 2,556 $ 6,880 Unearned revenue liability 680 Policyholders' account liability, per consolidated balance sheet $ 7,560 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Relates to Huatai Life. (3) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (4) Includes benefit payments upon maturity as well as death benefits. Three Months Ended March 31, 2023 (in millions of U.S. dollars) Universal Life Other (2) Total Balance – beginning of period $ 1,199 $ 1,374 $ 2,573 Premiums received 50 18 68 Policy charges (1) (30) (4) (34) Surrenders and withdrawals (15) (8) (23) Benefit payments (3) (4) (6) (10) Interest credited 8 8 16 Other (including foreign exchange) — 3 3 Balance – end of period $ 1,208 $ 1,385 $ 2,593 Unearned revenue liability 585 Policyholders' account liability, per consolidated balance sheet $ 3,178 (1) Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. (2) Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk. (3) Includes benefit payments upon maturity as well as death benefits. March 31 2024 2023 (in millions of U.S. dollars, except for percentages) Universal Life Annuities Other Universal Life Other Weighted-average crediting rate 2.9 % 2.6 % 2.5 % 2.6 % 3.0 % Net amount at risk (1) $ 12,014 $ — $ 499 $ 11,394 $ 156 Cash Surrender Value $ 1,623 $ 1,605 $ 2,239 $ 1,005 $ 1,075 (1) For those guarantees of benefits that are payable in the event of death, the net amount at risk is defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
Policyholder Account Balance, Guaranteed Minimum Crediting Rates	The following tables present the balance of account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders and the respective guaranteed minimum: Universal Life March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 482 $ — $ 39 $ 49 $ 570 2.01% – 4.00% 67 461 728 — 1,256 Greater than 4.00% 14 — — — 14 Total $ 563 $ 461 $ 767 $ 49 $ 1,840 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 455 $ — $ 32 $ 7 $ 494 2.01% – 4.00% 69 345 280 — 694 Greater than 4.00% 20 — — — 20 Total $ 544 $ 345 $ 312 $ 7 $ 1,208 Annuities March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 720 $ — $ 1,624 $ 1 $ 2,345 2.01% – 4.00% 139 — — — 139 Greater than 4.00% — — — — — Total $ 859 $ — $ 1,624 $ 1 $ 2,484 Other policyholders' account balances March 31, 2024 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 789 $ — $ 243 $ 533 $ 1,565 2.01% – 4.00% 378 613 — — 991 Greater than 4.00% — — — — — Total $ 1,167 $ 613 $ 243 $ 533 $ 2,556 March 31, 2023 (in millions of U.S. dollars) At Guaranteed Minimum 1 Basis Point - 50 Basis Points Above 51 Basis Points - 150 Basis Points Above Greater Than 150 Basis Points Above Total Guaranteed minimum crediting rates Up to 2.00% $ 446 $ — $ 212 $ 295 $ 953 2.01% – 4.00% 384 43 — — 427 Greater than 4.00% 5 — — — 5 Total $ 835 $ 43 $ 212 $ 295 $ 1,385
Fair Value, Separate Account Investment	The following table presents the aggregate fair value of Separate account assets, by major security type: March 31 March 31 (in millions of U.S. dollars) 2024 2023 Cash and cash equivalents $ 76 $ 116 Mutual funds 5,699 5,082 Fixed maturities 89 102 Total $ 5,864 $ 5,300
Separate Account, Liability	The following table presents a roll-forward of separate account liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 5,573 $ 5,190 Premiums and deposits 264 266 Policy charges (43) (35) Surrenders and withdrawals (210) (111) Benefit payments (105) (99) Investment performance 375 110 Other (including foreign exchange) 10 (21) Balance – end of period $ 5,864 $ 5,300 Cash surrender value (1) $ 5,655 $ 5,030 (1) Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges.
Unearned revenue liabilities	The following table presents a roll-forward of unearned revenue liabilities: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 673 $ 567 Deferred revenue 34 32 Amortization (18) (14) Other (including foreign exchange) (9) — Balance – end of period $ 680 $ 585

Market risk benefits (Tables)

Market risk benefits (Tables)	3 Months Ended
	Mar. 31, 2024
Market Risk Benefit [Abstract]
Market Risk Benefit, Activity	The following table presents a roll-forward of MRB: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Balance – beginning of period $ 771 $ 800 Balance, beginning of period, before effect of changes in the instrument-specific credit risk 749 776 Interest rate changes (57) 63 Effect of changes in equity markets (77) (75) Effect of changes in volatilities (20) 57 Actual policyholder behavior different from expected behavior 30 (2) Effect of timing and all other (31) (16) Balance, end of period, before effect of changes in the instrument-specific credit risk $ 594 $ 803 Effect of changes in the instrument-specific credit risk 17 27 Balance – end of period $ 611 $ 830 Weighted-average age of policyholders (years) 74 73 Net amount at risk (1) $ 1,683 $ 2,296 (1)
Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations	For MRB, Chubb estimates fair value using an internal valuation model which includes a number of factors including interest rates, equity markets, credit risk, current account value, market volatility, expected annuitization rates and other policyholder behavior, and changes in policyholder mortality. All reinsurance treaties contain claim limits, which are also factored into the valuation model. Valuation Technique Significant Unobservable Inputs March 31, 2024 March 31, 2023 Ranges Weighted Average (1) Ranges Weighted Average (1) MRB (1) Actuarial model Lapse rate 0.5% – 30.0% 4.3 % 0.5% – 30.4% 4.0 % Annuitization rate 0% – 100% 4.2 % 0% – 100% 4.4 % (1) The weighted-average lapse and annuitization rates are determined by weighting each treaty's rates by the MRB contract's fair value.

Commitments, contingencies, a_2

Commitments, contingencies, and guarantees (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Balance Sheet Locations, Fair Values In An Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments	The following table presents the balance sheet location, fair value of derivative instruments in an asset or (liability) position, and notional value/payment provision of our derivative instruments: March 31, 2024 December 31, 2023 Consolidated Fair Value Notional Fair Value Notional (in millions of U.S. dollars) Derivative Asset Derivative (Liability) Derivative Asset Derivative (Liability) Investment and embedded derivatives not designated as hedging instruments: Foreign currency forward contracts OA / (AP) $ 23 $ (135) $ 3,647 $ 27 $ (94) $ 3,662 Options/Futures contracts on notes and bonds OA / (AP) 5 (9) 1,746 27 (42) 2,062 Convertible securities (1) FM AFS / ES 64 — 69 56 — 64 $ 92 $ (144) $ 5,462 $ 110 $ (136) $ 5,788 Other derivative instruments: Futures contracts on equities (2) OA / (AP) $ — $ (22) $ 1,162 $ — $ (37) $ 1,157 Other OA / (AP) 1 (6) 269 — (5) 217 $ 1 $ (28) $ 1,431 $ — $ (42) $ 1,374 Derivatives designated as hedging instruments: Cross-currency swaps - fair value hedges OA / (AP) $ 133 $ — $ 1,642 $ 126 $ — $ 1,631 Cross-currency swaps - net investment hedges OA / (AP) 16 (110) 1,625 10 (128) 1,619 $ 149 $ (110) $ 3,267 $ 136 $ (128) $ 3,250 (1) Includes fair value of embedded derivatives. (2) Related to MRB book of business.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	Three Months Ended March 31 (pre-tax, in millions of U.S. dollars) 2024 2023 Gain (loss) recognized in OCI $ (8) $ (17) Net realized gain (loss) reclassified from OCI (37) 20 Interest expense reclassified from OCI (4) (4) OCI gain (loss) after reclassifications $ 33 $ (33)
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location	Three Months Ended March 31 (pre-tax, in millions of U.S. dollars) 2024 2023 Gain (loss) recognized in OCI $ 36 $ (23) Interest income reclassified from OCI 3 3 OCI gain (loss) after reclassifications $ 33 $ (26)
Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations	The following table presents net gains (losses) related to derivative instrument activity in the Consolidated statements of operations: Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Investment and embedded derivative instruments: Foreign currency forward contracts $ (52) $ (51) All other futures contracts, options, and equities 6 5 Convertible securities (1) 3 — Total investment and embedded derivative instruments $ (43) $ (46) Other derivative instruments: Futures contracts on equities (2) (95) (57) Other (2) (1) Total other derivative instruments $ (97) $ (58) $ (140) $ (104) (1) Includes embedded derivatives. (2) Related to MRB book of business.
Transfer of Certain Financial Assets Accounted for as Secured Borrowings	The following table presents the carrying value of collateral held under securities lending agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2024 December 31, 2023 (in millions of U.S. dollars) Overnight and Continuous Collateral held under securities lending agreements: Cash $ 698 $ 555 U.S. Treasury / Agency 275 33 Non-U.S. 654 621 Corporate and asset-backed securities 60 57 Municipal 4 6 Equity securities 17 27 $ 1,708 $ 1,299 Gross amount of recognized liability for securities lending payable $ 1,708 $ 1,299 The following table presents the carrying value of collateral pledged under repurchase agreements by investment category and remaining contractual maturity of the underlying agreements: Remaining contractual maturity March 31, 2024 December 31, 2023 Up to 30 Days 30-90 Days Total Up to 30 Days 30-90 Days Greater than Total (in millions of U.S. dollars) Collateral pledged under repurchase agreements: Cash $ — $ 4 $ 4 $ — $ 33 $ 1 $ 34 Non-U.S. 1,579 — 1,579 1,355 — — 1,355 U.S. Treasury / Agency — 100 100 — 105 — 105 Mortgage-backed securities 488 926 1,414 — 913 517 1,430 $ 2,067 $ 1,030 $ 3,097 $ 1,355 $ 1,051 $ 518 $ 2,924 Gross amount of recognized liabilities for repurchase agreements $ 3,022 $ 2,833 Difference (1) $ 75 $ 91 (1) Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2024
Stockholders' Equity Note [Abstract]
Share Repurchase Program [Table Text Block]	The following table presents repurchases of Chubb's Common Shares conducted in a series of open market transactions under the Board authorizations: Three Months Ended April 1,2024 March 31 (in millions of U.S. dollars, except share data) 2024 2023 Number of shares repurchased 1,220,121 2,010,400 250,000 Cost of shares repurchased $ 316 $ 428 $ 62 Repurchase authorization remaining at end of period $ 3,373 $ 1,193 $ 3,312
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents changes in accumulated other comprehensive income (loss): Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Accumulated other comprehensive income (loss) (AOCI) Net unrealized appreciation (depreciation) on investments Balance – beginning of period, net of tax $ (4,177) $ (7,279) Change in period, before reclassification from AOCI (before tax) (796) 1,606 Amounts reclassified from AOCI (before tax) 119 180 Change in period, before tax (677) 1,786 Income tax (expense) benefit 42 (166) Total other comprehensive income (loss) (635) 1,620 Noncontrolling interests, net of tax 13 — Balance – end of period, net of tax (4,825) (5,659) Current discount rate on liability for future policy benefits Balance – beginning of period, net of tax 51 (75) Change in period, before tax (53) (151) Income tax (expense) benefit (20) 21 Total other comprehensive loss (73) (130) Noncontrolling interests, net of tax (33) — Balance – end of period, net of tax 11 (205) Instrument-specific credit risk on market risk benefits Balance – beginning of period, net of tax (22) (24) Change in period, before and net of tax 5 (3) Total other comprehensive income (loss) 5 (3) Noncontrolling interests, net of tax — — Balance – end of period, net of tax (17) (27) Cumulative foreign currency translation adjustment Balance – beginning of period, net of tax (2,945) (2,966) Change in period, before reclassification from AOCI (before tax) 83 (174) Amounts reclassified from AOCI (before tax) (3) (3) Change in period, before tax 80 (177) Income tax (expense) benefit (7) 7 Total other comprehensive income (loss) 73 (170) Noncontrolling interests, net of tax (8) — Balance – end of period, net of tax (2,864) (3,136) Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Accumulated other comprehensive income (loss) (AOCI) - continued Fair value hedging instruments Balance – beginning of period, net of tax (13) (66) Change in period, before reclassification from AOCI (before tax) (8) (17) Amounts reclassified from AOCI (before tax) 41 (16) Change in period, before tax 33 (33) Income tax (expense) benefit (7) 7 Total other comprehensive income (loss) 26 (26) Noncontrolling interests, net of tax — — Balance – end of period, net of tax 13 (92) Postretirement benefit liability adjustment Balance – beginning of period, net of tax 297 225 Change in period, before tax (2) — Income tax (expense) benefit 1 (1) Total other comprehensive loss (1) (1) Noncontrolling interests, net of tax — — Balance – end of period, net of tax 296 224 Accumulated other comprehensive loss $ (7,386) $ (8,895)
Reclassification out of Accumulated Other Comprehensive Income	The following table presents reclassifications from accumulated other comprehensive income (loss) to the Consolidated statements of operations: Three Months Ended Consolidated Statement of Operations Location March 31 (in millions of U.S. dollars) 2024 2023 Fixed maturities available-for-sale $ (119) $ (180) Net realized gains (losses) Income tax benefit 12 18 Income tax expense $ (107) $ (162) Net income Cumulative foreign currency translation adjustment Cross-currency swaps $ 3 $ 3 Interest expense Income tax expense (1) (1) Income tax expense $ 2 $ 2 Net income Net gains (losses) of fair value hedging instruments Cross-currency swaps $ (37) $ 20 Net realized gains (losses) Cross-currency swaps (4) (4) Interest expense Income tax (expense) benefit 9 (3) Income tax expense $ (32) $ 13 Net income Total amounts reclassified from AOCI $ (137) $ (147)

Postretirement benefits (Tables

Postretirement benefits (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The components of net pension and other postretirement benefit costs (benefits) reflected in Net income in the Consolidated statements of operations were as follows: Pension Benefit Plans Other Postretirement 2024 2023 2024 2023 Three Months Ended March 31 U.S. Plans Non-U.S. Plans U.S. Plans Non-U.S. Plans (in millions of U.S. dollars) Service cost $ — $ 2 $ — $ 2 $ — $ — Non-service cost (benefit): Interest cost 33 9 34 9 1 — Expected return on plan assets (61) (13) (56) (12) (1) (1) Amortization of net actuarial (gain) loss — 1 — — (1) — Amortization of prior service cost — — — — — — Settlements — — — — — — Total non-service cost (benefit) (28) (3) (22) (3) (1) (1) Net periodic benefit cost (benefit) $ (28) $ (1) $ (22) $ (1) $ (1) $ (1) The line items in which the service cost and non-service cost (benefit) components of net periodic cost (benefit) are included in the Consolidated statements of operations were as follows: Pension Benefit Plans Other Postretirement Three Months Ended March 31 2024 2023 2024 2023 (in millions of U.S. dollars) Service cost: Losses and loss expenses $ — $ — $ — $ — Administrative expenses 2 2 — — Total service cost 2 2 — — Non-service cost (benefit): Losses and loss expenses (3) (2) — — Administrative expenses (28) (23) (1) (1) Total non-service cost (benefit) (31) (25) (1) (1) Net periodic benefit cost (benefit) $ (29) $ (23) $ (1) $ (1)

Other Income and Expense (Table

Other Income and Expense (Tables)	3 Months Ended
	Mar. 31, 2024
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense)	Three Months Ended March 31 (in millions of U.S. dollars) 2024 2023 Equity in net income (loss) of partially-owned entities $ 184 $ 340 Gains (losses) from fair value changes in separate account assets (1) 10 (25) Asset management and performance fee revenue 53 — Asset management and performance fee expense (33) — Federal excise and capital taxes (4) (5) Other (19) (14) Total $ 191 $ 296 (1) Related to gains (losses) from fair value changes in separate account assets that do not qualify for separate account reporting under U.S. GAAP.

Segment information (Tables)

Segment information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Operations By Segment	The following tables present the Statement of Operations by segment: For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Life Insurance Corporate Segment Measure Reclass Chubb Consolidated Net premiums written $ 4,689 $ 1,456 $ 249 $ 3,835 $ 359 $ 1,633 $ — $ — $ 12,221 Net premiums earned 4,880 1,471 128 3,198 295 1,611 — — 11,583 Losses and loss expenses 3,175 899 49 1,426 137 32 10 (1) 5,727 Policy benefits — — — 100 — 1,070 — 10 1,180 Policy acquisition costs 688 300 21 823 81 294 — — 2,207 Administrative expenses 328 86 2 331 9 207 107 1,070 Underwriting income (loss) 689 186 56 518 68 8 (117) (9) 1,399 Net investment income 826 102 21 267 57 230 (26) (86) 1,391 Other (income) expense 7 1 — 5 — (40) (68) (96) (191) Amortization expense of — 2 6 20 — 10 42 — 80 Segment income (loss) $ 1,508 $ 285 $ 71 $ 760 $ 125 $ 268 $ (117) $ 1 $ 2,901 Net realized gains (losses) (100) (1) (101) Market risk benefits gains (losses) 21 — 21 Interest expense 178 — 178 Cigna integration expenses 7 — 7 Income tax expense 342 — 342 Net income (loss) (723) — 2,294 Net loss attributable to noncontrolling interests 151 — 151 Net income (loss) attributable to Chubb $ (874) $ — $ 2,143 For the Three Months Ended North America Commercial P&C Insurance North America Personal P&C Insurance North America Agricultural Insurance Overseas General Insurance Global Life Insurance Corporate Segment Measure Reclass Chubb Net premiums written $ 4,288 $ 1,296 $ 293 $ 3,263 $ 277 $ 1,293 $ — $ — $ 10,710 Net premiums earned 4,369 1,320 159 2,786 244 1,264 — — 10,142 Losses and loss expenses 2,729 888 140 1,237 112 32 11 (1) 5,148 Policy benefits — — — 110 — 712 — (25) 797 Policy acquisition costs 613 272 15 713 62 273 — — 1,948 Administrative expenses 295 79 3 280 9 167 97 — 930 Underwriting income (loss) 732 81 1 446 61 80 (108) 26 1,319 Net investment income 698 82 17 188 49 153 11 (91) 1,107 Other (income) expense 7 1 1 (9) (1) (15) (214) (66) (296) Amortization expense of — 2 6 18 — 4 42 — 72 Segment income $ 1,423 $ 160 $ 11 $ 625 $ 111 $ 244 $ 75 $ 1 $ 2,650 Net realized gains (losses) (76) (1) (77) Market risk benefits gains (losses) (115) — (115) Interest expense 160 — 160 Cigna integration expenses 22 — 22 Income tax expense 384 — 384 Net income (loss) $ (682) $ — $ 1,892

Earnings per share (Tables)

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share, Basic And Diluted	Three Months Ended March 31 (in millions of U.S. dollars, except share and per share data) 2024 2023 Numerator: Net income $ 2,294 $ 1,892 Net income attributable to noncontrolling interests 151 — Net income attributable to Chubb $ 2,143 $ 1,892 Denominator: Denominator for basic earnings per share attributable to Chubb: Weighted-average shares outstanding 405,662,694 414,289,150 Denominator for diluted earnings per share attributable to Chubb: Share-based compensation plans 4,076,941 3,639,042 Weighted-average shares outstanding and assumed conversions 409,739,635 417,928,192 Basic earnings per share attributable to Chubb $ 5.28 $ 4.57 Diluted earnings per share attributable to Chubb $ 5.23 $ 4.53 Potential anti-dilutive share conversions 1,005,420 1,731,523

General and significant accou_3

General and significant accounting policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jul. 01, 2023
General and significant accounting policies [Line Items]
Goodwill, Period Increase (Decrease)	$ 10
Huatai Group
General and significant accounting policies [Line Items]
Subsidiary, Ownership Percentage, Parent	85.50%	76.50%	69.60%

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jul. 01, 2023	Jun. 30, 2023
Huatai Group
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Parent	85.50%	76.50%	69.60%
Additional 9.0 percent ownership interest obtained in subsidiary	9%
Outstanding 0.6 percent additional ownership interest agreed on	0.60%
Huatai Group
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage				64.20%
Huatai Group
Business Acquisition [Line Items]
Payments to Acquire Additional Interest in Subsidiaries	$ 236
Deposits previously paid on additional ownership interest obtained	319
Deposits previously paid on additional ownership interest agreed on	12
Outstanding payment to be made on additional ownership interest agreed on	24
Payment on additional ownership interest obtained, including deposits previously paid	$ 555

Acquisitions (Pro forma) (Detai

Acquisitions (Pro forma) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Business Acquisition [Line Items]
Net premiums earned	$ 11,583	$ 10,142
Huatai Group | Pro Forma
Business Acquisition [Line Items]
Net premiums earned		10,553
Total revenues		11,529
Net income		1,900
Net income attributable to Chubb		$ 1,890

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments [Line Items]
Restricted assets in fixed maturities and short-term investments	$ 18,568	$ 18,242
Restricted assets in cash	143	172
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure	140	$ 153
Investments
Investments [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 543

Investments (Schedule Of Amorti

Investments (Schedule Of Amortized Cost and Fair Value of Available-for-Sale Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 113,479	$ 111,128
Debt Securities, Available-for-sale, Allowance for Credit Loss	(115)	(156)	$ (168)	$ (169)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,012	1,148
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(6,087)	(5,549)
Available for sale, Fair Value	108,289	106,571
U.S. Treasury / Agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,058	3,721
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5	13
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(164)	(144)
Available for sale, Fair Value	2,899	3,590
Non-U.S.
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	36,962	35,918
Debt Securities, Available-for-sale, Allowance for Credit Loss	(41)	(49)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	605	592
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(1,381)	(1,297)
Available for sale, Fair Value	36,145	35,164
Corporate and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	45,567	44,695
Debt Securities, Available-for-sale, Allowance for Credit Loss	(73)	(104)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	306	390
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,353)	(2,151)
Available for sale, Fair Value	43,447	42,830
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	25,696	23,720
Debt Securities, Available-for-sale, Allowance for Credit Loss	(1)	(3)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	89	143
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(2,029)	(1,802)
Available for sale, Fair Value	23,755	22,058
Municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,196	3,074
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7	10
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before tax	(160)	(155)
Available for sale, Fair Value	$ 2,043	$ 2,929

Investments (Schedule Of Fixed

Investments (Schedule Of Fixed Maturities By Contractual Maturity) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Available for sale, Due in 1 year or less, Fair Value & Net Carrying Value	$ 4,521	$ 4,729
Available for sale, Due after 1 year through 5 years, Fair Value & Net Carrying Value	33,533	33,573
Available for sale, Due after 5 years through 10 years, Fair Value & Net Carrying Value	28,198	28,480
Available for sale, Due after 10 years, Fair Value & Net Carrying Value	18,282	17,731
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	84,534	84,513
Available for sale, Mortgage backed securities, Fair Value & Net Carrying Value	23,755	22,058
Available for sale, Fair Value	$ 108,289	$ 106,571

Investments (Aggregate Fair Val

Investments (Aggregate Fair Value And Gross Unrealized Loss By Length Of Time Security Has Continuously Been In Unrealized Loss Position) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 14,450	$ 8,569
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(242)	(176)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	52,582	53,950
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,784)	(4,129)
Debt Securities, Available-for-sale, Unrealized Loss Position	67,032	62,519
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(5,026)	(4,305)
U.S. Treasury / Agency
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	632	463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(13)	(9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,007	2,504
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(151)	(135)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,639	2,967
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(164)	(144)
Non-U.S.
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,793	2,464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(64)	(43)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	15,928	15,971
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,079)	(957)
Debt Securities, Available-for-sale, Unrealized Loss Position	19,721	18,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,143)	(1,000)
Corporate and asset-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,675	2,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(71)	(51)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	19,646	20,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,487)	(1,194)
Debt Securities, Available-for-sale, Unrealized Loss Position	24,321	23,200
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,558)	(1,245)
Mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	4,907	1,659
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(82)	(58)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,783	13,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,919)	(1,706)
Debt Securities, Available-for-sale, Unrealized Loss Position	18,690	15,490
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2,001)	(1,764)
Municipal
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	443	1,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(12)	(15)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,218	1,310
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(148)	(137)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,661	2,427
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (160)	$ (152)

Investments (Rollforward of exp

Investments (Rollforward of expected credit-losses, AFS) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Debt Securities, Available for sale, Allowance for Credit Loss	$ 115	$ 168	$ 156	$ 169
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	31	59
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	(5)	(2)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery	$ (67)	$ (58)

Investments (Rollforward of e_2

Investments (Rollforward of expected credit losses HTM) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Debt Securities, Held to maturity, Allowance for Credit Loss	$ 0	$ 33	$ 0	$ 34
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery	$ 0	$ (1)

Investments (Rollforward of e_3

Investments (Rollforward of expected credit losses Private Debt HFI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Private Debt, Held-for-investment, Allowance for Credit Loss [Line Items]
Private debt held-to-maturity, amortized cost	$ 5	$ 0	$ 4	$ 0
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 1	$ 0

Investments (Net Realized Gains

Investments (Net Realized Gains (Losses) And Losses Included In Net Realized Gains (Losses) And Other Comprehensive Income) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)		$ (101)	$ (77)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease)		31	59
Debt Securities, Available-for-sale, Gain (Loss), Total		49	(180)
Foreign exchange		(131)	131
Gain (Loss) on Derivative		(140)	(104)
Other		(8)	(7)
Fixed Maturities [Member]
Gain (Loss) on Securities [Line Items]
Debt Securities, Available-for-Sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment		16	2
Debt Securities, Available-for-Sale, Realized Loss, Excluding Other-than-temporary Impairment		(141)	(159)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease)		40	2
Debt Securities, Available-For-Sale, Credit Impairment Charges Intent to Sell	[1]	(34)	(25)
Equity Securities
Gain (Loss) on Securities [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)		3	11
Other Investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)		168	0
Alternative Investment
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)		31	15
Other derivative instruments
Gain (Loss) on Securities [Line Items]
Gain (Loss) on Derivative		(2)	(1)
Investment and embedded derivative instruments
Gain (Loss) on Securities [Line Items]
Gain (Loss) on Derivative		$ (43)	$ (46)
[1] Relates to certain securities we intended to sell and securities written to market entering default.

Investments Schedule of Gains a

Investments Schedule of Gains and Losses on Equity and Other Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)	$ (101)	$ (77)
Equity Securities
Gain (Loss) on Securities [Line Items]
Equity Securities, FV-NI, Realized Gain (Loss)	3	11
Less: Net gains (losses) recognized from sales of securities	(3)	(5)
Unrealized Gain (Loss) on Investments	6	16
Other Investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)	168	0
Less: Net gains (losses) recognized from sales of securities	0
Unrealized Gain (Loss) on Investments	168
Alternative Investment
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)	31	15
Less: Net gains (losses) recognized from sales of securities	0	0
Unrealized Gain (Loss) on Investments	31	15
Equity securities and other investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses)	202	26
Less: Net gains (losses) recognized from sales of securities	(3)	(5)
Unrealized Gain (Loss) on Investments	$ 205	$ 31

Investments Entities that Calcu

Investments Entities that Calculate Net Asset Value Per Share (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	$ 14,281	$ 14,078
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	5,905	6,210
Financial [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	1,289	1,241
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	341	364
Real Estate Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	2,095	2,137
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	424	445
Distressed Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	1,218	1,206
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	928	936
Private Credit Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	328	331
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	296	298
Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	9,052	8,873
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	3,916	4,167
Vintage Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	67	72
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	0	0
Investment Funds Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Private equities	232	218
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 0	$ 0
Minimum | Financial [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Minimum | Real Estate Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Minimum | Distressed Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Minimum | Private Credit Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years
Minimum | Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	2 years	2 years
Minimum | Vintage Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	1 year	1 year
Maximum | Financial [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	10 years	10 years
Maximum | Real Estate Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	13 years	13 years
Maximum | Distressed Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	8 years	8 years
Maximum | Private Credit Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	8 years	8 years
Maximum | Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	14 years	14 years
Maximum | Vintage Alternative Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period	3 years	3 years

Investments (Schedule Of Compon

Investments (Schedule Of Components Of Restricted Assets) (Detail) - Asset Pledged as Collateral without Right - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments [Line Items]
Trust funds	$ 8,626	$ 8,482
Deposits with U.S. regulatory authorities	2,488	2,544
Deposits with non-U.S. regulatory authorities	3,595	3,584
Assets pledged under repurchase agreements	3,097	2,924
Other pledged assets	905	880
Total restricted assets	$ 18,711	$ 18,414

Fair value measurements (Financ

Fair value measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2024		Dec. 31, 2023		Mar. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 108,289		$ 106,571
Equity securities	3,769		3,455
Short-term investments	5,107		4,551
Other Investments	6,216		5,527
Securities lending collateral	1,708		1,299
Separate account assets	5,864		5,573		$ 5,300
Market risk benefits	611		771
Private equities	14,281		14,078
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Private equities	14,281		14,078
Policy Loans
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Other Investments	736		702
U.S. Treasury / Agency
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,899		3,590
Non-U.S.
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	36,145		35,164
Corporate and asset-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	43,447		42,830
Mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	23,755		22,058
Municipal
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,043		2,929
Level 1 | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,251		2,911
Equity securities	3,668		3,368
Short-term investments	3,292		1,915
Other Investments	583	[1]	589	[2]
Securities lending collateral	0		0
Investment derivatives	28		54
Derivatives designated as hedging instruments	0		0
Other derivative instruments	1
Separate account assets	5,775		5,482
Total assets measured at fair value	15,598	[1],[3]	14,319	[2],[4]
Investment derivatives	144		136
Derivatives designated as hedging instruments	0		0
Other derivative instruments, liability	22		37
Market risk benefits	0	[5]	0	[6]
Total liabilities measured at fair value	166		173
Level 1 | U.S. Treasury / Agency | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,251		2,911
Level 1 | Non-U.S. | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Level 1 | Corporate and asset-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Level 1 | Mortgage-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Level 1 | Municipal | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Level 2 | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	102,655		100,339
Equity securities	0		0
Short-term investments	1,810		2,633
Other Investments	4,897	[1]	4,236	[2]
Securities lending collateral	1,708		1,299
Investment derivatives	0		0
Derivatives designated as hedging instruments	149		136
Other derivative instruments	0
Separate account assets	89		91
Total assets measured at fair value	111,308	[1],[3]	108,734	[2],[4]
Investment derivatives	0		0
Derivatives designated as hedging instruments	110		128
Other derivative instruments, liability	6		5
Market risk benefits	0	[5]	0	[6]
Total liabilities measured at fair value	116		133
Level 2 | U.S. Treasury / Agency | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	648		679
Level 2 | Non-U.S. | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	35,427		34,472
Level 2 | Corporate and asset-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	40,789		40,208
Level 2 | Mortgage-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	23,748		22,051
Level 2 | Municipal | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,043		2,929
Level 3 | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	3,383		3,321
Equity securities	101		87
Short-term investments	5		3
Other Investments	0	[1]	0	[2]
Securities lending collateral	0		0
Investment derivatives	0		0
Derivatives designated as hedging instruments	0		0
Other derivative instruments	0
Separate account assets	0		0
Total assets measured at fair value	3,489	[1],[3]	3,411	[2],[4]
Investment derivatives	0		0
Derivatives designated as hedging instruments	0		0
Other derivative instruments, liability	0		0
Market risk benefits	611	[5]	771	[6]
Total liabilities measured at fair value	611		771
Level 3 | U.S. Treasury / Agency | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Level 3 | Non-U.S. | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	718		692
Level 3 | Corporate and asset-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,658		2,622
Level 3 | Mortgage-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	7		7
Level 3 | Municipal | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0		0
Total Level 1, Level 2, and Level 3 | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	108,289		106,571
Equity securities	3,769		3,455
Short-term investments	5,107		4,551
Other Investments	5,480	[1]	4,825	[2]
Securities lending collateral	1,708		1,299
Investment derivatives	28		54
Derivatives designated as hedging instruments	149		136
Other derivative instruments	1
Separate account assets	5,864		5,573
Total assets measured at fair value	130,395	[1],[3]	126,464	[2],[4]
Investment derivatives	144		136
Derivatives designated as hedging instruments	110		128
Other derivative instruments, liability	28		42
Market risk benefits	611	[5]	771	[6]
Total liabilities measured at fair value	893		1,077
Total Level 1, Level 2, and Level 3 | U.S. Treasury / Agency | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,899		3,590
Total Level 1, Level 2, and Level 3 | Non-U.S. | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	36,145		35,164
Total Level 1, Level 2, and Level 3 | Corporate and asset-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	43,447		42,830
Total Level 1, Level 2, and Level 3 | Mortgage-backed securities | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	23,755		22,058
Total Level 1, Level 2, and Level 3 | Municipal | Fair Value, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 2,043		$ 2,929
[1] Excluded from the table above are other investments of $736 million, principally policy loans at March 31, 2024, measured using NAV as a practical expedient. Excluded from the table above are other investments of $702 million, principally policy loans at December 31, 2023, measured using NAV as a practical expedient. Excluded from the table above are Private equities of $14,281 million at March 31, 2024, measured using NAV as a practical expedient. Excluded from the table above are Private equities of $14,078 million at December 31, 2023, measured using NAV as a practical expedient. Refer to Note 10 for additional information on Market risk benefits. Refer to Note 10 for additional information on Market risk benefits.

Fair value measurements (Assets

Fair value measurements (Assets, Measured At Fair Value Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other comprehensive income (loss), before income tax	Other comprehensive income (loss), before income tax
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenues	Revenues
Level 3 | Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	$ 87	$ 90
Transfers Into Level 3, Asset	0
Transfers out of Level 3, Assets	0	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0	0
Net Realized Gains/ (Losses), Assets	(3)	(4)
Purchases, Assets	18	7
Sales, Assets	(1)	(5)
Settlements, Assets	0	0
Balance-End of Period, Assets	101	88
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	(2)	(3)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets	0	0
Level 3 | Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	3	3
Transfers Into Level 3, Asset	0
Transfers out of Level 3, Assets	0	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0	(1)
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	4	5
Sales, Assets	0	0
Settlements, Assets	(2)	0
Balance-End of Period, Assets	5	7
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets	0	(1)
Level 3 | Available-for-Sale Debt Securities | Non-U.S.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	692	564
Transfers Into Level 3, Asset	1
Transfers out of Level 3, Assets	(4)	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	14	(4)
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	72	43
Sales, Assets	(20)	(31)
Settlements, Assets	(37)	(11)
Balance-End of Period, Assets	718	561
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets	13	(6)
Level 3 | Available-for-Sale Debt Securities | Corporate and asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	2,622	2,449
Transfers Into Level 3, Asset	1
Transfers out of Level 3, Assets	(3)	(11)
Change in Net Unrealized Gains (Losses) included in OCI, Assets	6	(2)
Net Realized Gains/ (Losses), Assets	0	2
Purchases, Assets	143	205
Sales, Assets	(20)	(20)
Settlements, Assets	(91)	(79)
Balance-End of Period, Assets	2,658	2,544
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	4
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets	6	(5)
Level 3 | Available-for-Sale Debt Securities | Mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance- Beginning of Period, Assets	7	11
Transfers Into Level 3, Asset	0
Transfers out of Level 3, Assets	0	0
Change in Net Unrealized Gains (Losses) included in OCI, Assets	0	0
Net Realized Gains/ (Losses), Assets	0	0
Purchases, Assets	0	0
Sales, Assets	0	0
Settlements, Assets	0	(1)
Balance-End of Period, Assets	7	10
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	0	0
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets	$ 0	$ 0

Fair value measurements (Carryi

Fair value measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	$ 2,708	$ 2,553
Total assets (preliminary)	234,867	230,682
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	3,022	2,833
Short-term debt	2,265	1,460
Long-term debt	13,248	13,035
Total liabilities	170,436	166,991
Portion at Other than Fair Value Measurement | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	0	0
Total assets (preliminary)	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	0	0
Short-Term Debt, Fair Value	0	0
Long-term Debt, Fair Value	0	0
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	0	0
Total liabilities	0	0
Portion at Other than Fair Value Measurement | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	0	0
Total assets (preliminary)	0	0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	3,022	2,833
Short-Term Debt, Fair Value	2,228	1,431
Long-term Debt, Fair Value	11,930	11,924
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	365	365
Total liabilities	17,545	16,553
Portion at Other than Fair Value Measurement | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	2,733	2,560
Total assets (preliminary)	2,733	2,560
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	0	0
Short-Term Debt, Fair Value	0	0
Long-term Debt, Fair Value	0	0
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	0	0
Total liabilities	0	0
Portion at Other than Fair Value Measurement | Total Level 1, Level 2, and Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	2,733	2,560
Total assets (preliminary)	2,733	2,560
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	3,022	2,833
Short-Term Debt, Fair Value	2,228	1,431
Long-term Debt, Fair Value	11,930	11,924
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	365	365
Total liabilities	17,545	16,553
Reported Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Private debt held-for-investment	2,708	2,553
Total assets (preliminary)	2,708	2,553
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Repurchase agreements	3,022	2,833
Short-term debt	2,265	1,460
Long-term debt	13,248	13,035
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	309	308
Total liabilities	$ 18,844	$ 17,636

Reinsurance (Reinsurance Recove

Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Reinsurance Disclosures [Abstract]
Reinsurance recoverable on unpaid losses and loss expenses	[1]	$ 17,163	$ 17,884	$ 16,520	$ 17,086
Reinsurance recoverable on paid losses and loss expenses	[1]	1,946	2,068
Reinsurance recoverable on losses and loss expenses	[1]	19,109	19,952
Reinsurance recoverable on policy benefits	[1]	272	280
Reinsurance Recoverables on Unpaid Losses, Allowance		290	285
Reinsurance Recoverables on Paid Losses, Allowance		85	82
Reinsurance Recoverable, Allowance for Credit Loss, Total		375	367	$ 351	$ 351
Reinsurance Recoverables on Future Policy Benefits, Allowance		$ 0	$ 0
[1] Net of valuation allowance for uncollectible reinsurance.

Reinsurance, Allowance (Details

Reinsurance, Allowance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reinsurance Disclosures [Abstract]
Valuation allowance for uncollectible reinsurance - beginning of period	$ 367	$ 351
Provision for uncollectible reinsurance	8	5
Write-offs charged against the valuation allowance	0	(5)
Valuation allowance for uncollectible reinsurance - end of period	$ 375	$ 351

Deferred acquisition costs (Det

Deferred acquisition costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	$ 7,537
Balance – beginning of period	7,152
Amortization expense	(2,207)	$ (1,948)
Balance - end of period	7,537
Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Amortization expense	(294)	(273)
Overseas General Insurance [Member]
Deferred Policy Acquisition Cost [Line Items]
Amortization expense	(823)	(713)
Short-Duration Insurance, Other
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	3,510	3,003
Balance - end of period	3,510	3,003
Long-Duration Insurance, Other
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	4,027	3,293
Balance - end of period	4,027	3,293
Long-Duration Insurance, Other | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	3,411	2,651
Balance – beginning of period	3,185	2,514
Capitalizations	339	222
Amortization expense	(104)	(84)
Other (including foreign exchange)	(9)	(1)
Balance - end of period	3,411	2,651
Long-Duration Insurance, Other | Overseas General Insurance [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	616	642
Balance - end of period	616	642
Term Life Insurance | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	413	349
Balance – beginning of period	402	324
Capitalizations	47	42
Amortization expense	(28)	(24)
Other (including foreign exchange)	(8)	7
Balance - end of period	413	349
Universal Life | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	688	644
Balance – beginning of period	674	639
Capitalizations	33	25
Amortization expense	(20)	(19)
Other (including foreign exchange)	1	(1)
Balance - end of period	688	644
Whole Life Insurance | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	608	424
Balance – beginning of period	534	392
Capitalizations	85	28
Amortization expense	(8)	(5)
Other (including foreign exchange)	(3)	9
Balance - end of period	608	424
Accident and Health Insurance Product Line [Member] | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	1,421	969
Balance – beginning of period	1,301	891
Capitalizations	158	123
Amortization expense	(41)	(30)
Other (including foreign exchange)	3	(15)
Balance - end of period	1,421	969
Insurance, Other | Segment Life [Member]
Deferred Policy Acquisition Cost [Line Items]
Deferred Policy Acquisition Cost	281	265
Balance – beginning of period	274	268
Capitalizations	16	4
Amortization expense	(7)	(6)
Other (including foreign exchange)	(2)	(1)
Balance - end of period	$ 281	$ 265

Unpaid losses and loss expens_3

Unpaid losses and loss expenses (RF) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Unpaid Losses and Loss Expenses [Roll Forward]
Gross unpaid losses and loss expenses – beginning of period		$ 80,122	$ 75,747
Reinsurance recoverable on unpaid losses – beginning of period (1)	[1]	(17,884)	(17,086)
Net unpaid losses and loss expenses – beginning of period		62,238	58,661
Current Year Claims and Claims Adjustment Expense		5,980	5,336
Prior Year Claims and Claims Adjustment Expense	[2]	(253)	(188)
Total, Incurred		5,727	5,148
Net loss and loss expenses paid, Current Year		767	805
Net loss and loss expenses paid, Prior Years		4,055	3,911
Total, Paid		4,822	4,716
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other		35	(196)
Net unpaid losses and loss expenses – end of period		63,178	58,897
Reinsurance recoverable on unpaid losses (1)	[1]	17,163	16,520
Gross unpaid losses and loss expenses – end of period		80,341	75,417
prior period development, net adjustments		46	$ (8)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)		$ 940
[1] Net of valuation allowance for uncollectible reinsurance. Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments, earned premiums, and A&H long-duration lines totaling $46 million and $(8) million for the three months ended March 31, 2024 and 2023, respectively.

Unpaid losses and loss expens_4

Unpaid losses and loss expenses Unpaid losses and loss expenses (PPD table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	$ (207)	$ (196)
North America Commercial P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(48)	(72)
North America Personal P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(52)	17
North American Agriculture Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(28)	0
Overseas General Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(89)	(143)
Global Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	1	(8)
Corporate Segment [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	9	10
Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(311)	(215)
Short Tail [Member] | North America Commercial P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(144)	(81)
Short Tail [Member] | North America Personal P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(52)	17
Short Tail [Member] | North American Agriculture Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(28)	0
Short Tail [Member] | Overseas General Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(88)	(143)
Short Tail [Member] | Global Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	1	(8)
Short Tail [Member] | Corporate Segment [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	0	0
Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	104	19
Long Tail [Member] | North America Commercial P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	96	9
Long Tail [Member] | North America Personal P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	0	0
Long Tail [Member] | North American Agriculture Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	0	0
Long Tail [Member] | Overseas General Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(1)	0
Long Tail [Member] | Global Reinsurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	0	0
Long Tail [Member] | Corporate Segment [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	$ 9	$ 10

Unpaid losses and loss expens_5

Unpaid losses and loss expenses Unpaid losses and loss expenses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)	$ 940
Net Prior Period Development	(207)	$ (196)
Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	104	19
Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(311)	(215)
North America Commercial P&C Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(48)	(72)
North America Commercial P&C Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	96	9
North America Commercial P&C Insurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(144)	(81)
North America Commercial P&C Insurance [Member] | Commercial Excess and Umbrella [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	102
North America Commercial P&C Insurance [Member] | Surety Product Line [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(74)
North America Commercial P&C Insurance [Member] | Property and Inland Marine
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(62)
Overseas General Insurance [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(89)	(143)
Overseas General Insurance [Member] | Long Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(1)	0
Overseas General Insurance [Member] | Short Tail [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	(88)	(143)
Overseas General Insurance [Member] | Property, Liability and Casualty Insurance Product Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development	$ (58)	(85)
Overseas General Insurance [Member] | Property, Liability and Casualty Insurance Product Line | Catastrophe [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
Net Prior Period Development		$ (43)

Future policy benefits (Rollfor

Future policy benefits (Rollforward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Deferred profit liability		$ 1,351	$ 952
Net liability for future policy benefits, before reinsurance recoverable		14,375	10,782	$ 13,888
Less: Reinsurance recoverable on future policy benefits	[1]	272		280
Segment Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Balance – beginning of period		16,036	14,867
Beginning balance at original discount rate				16,693	$ 15,529
Effect of changes in cash flow assumptions				185	(769)
Effect of actual variances from expected experience				(16)	(104)
Adjusted beginning of period balance		16,862	14,656
Issuances		1,059	394
Interest accrual		174	171
Net premiums collected (1)	[2]	(737)	(459)
Other (including foreign exchange)		73	(95)
Ending balance at original discount rate		17,431	14,667
Effect of changes in discount rate assumptions		(684)	(319)
Balance – end of period		16,747	14,348
Balance – beginning of period		27,462	23,324
Beginning balance at original discount rate				28,303	24,456
Effect of changes in cash flow assumptions				194	(776)
Effect of actual variances from expected experience				(6)	(98)
Adjusted beginning of period balance		28,491	23,582
Issuances		1,059	394
Interest accrual		260	242
Benefits payments		(550)	(476)
Other (including foreign exchange)		163	(67)
Ending balance at original discount rate		29,423	23,675
Effect of changes in discount rate assumptions		(801)	(623)
Balance – end of period		28,622	23,052
Net liability for future policy benefits		11,875	8,704
Deferred profit liability		1,351	952
Net liability for future policy benefits, before reinsurance recoverable		13,226	9,656
Less: Reinsurance recoverable on future policy benefits		266	250
Net liability for future policy benefits, after reinsurance recoverable		$ 12,960	$ 9,406
Weighted average duration (years)		19 years 3 months 18 days	17 years 8 months 12 days
Other Segments
Liability for Future Policy Benefit, Activity [Line Items]
Net liability for future policy benefits, before reinsurance recoverable		$ 1,149	$ 1,126
Term Life Insurance | Segment Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Balance – beginning of period		1,590	1,806
Beginning balance at original discount rate				1,992	1,867
Effect of changes in cash flow assumptions				6	17
Effect of actual variances from expected experience				(1)	(6)
Adjusted beginning of period balance		1,997	1,878
Issuances		65	36
Interest accrual		14	28
Net premiums collected (1)	[2]	(57)	(44)
Other (including foreign exchange)		(5)	35
Ending balance at original discount rate		2,014	1,933
Effect of changes in discount rate assumptions		(407)	(48)
Balance – end of period		1,607	1,885
Balance – beginning of period		2,254	2,321
Beginning balance at original discount rate				2,749	2,447
Effect of changes in cash flow assumptions				8	20
Effect of actual variances from expected experience				3	(3)
Adjusted beginning of period balance		2,760	2,464
Issuances		65	36
Interest accrual		19	32
Benefits payments		(59)	(46)
Other (including foreign exchange)		30	72
Ending balance at original discount rate		2,815	2,558
Effect of changes in discount rate assumptions		(516)	(118)
Balance – end of period		2,299	2,440
Net liability for future policy benefits		692	555
Deferred profit liability		254	223
Net liability for future policy benefits, before reinsurance recoverable		946	778
Less: Reinsurance recoverable on future policy benefits		107	105
Net liability for future policy benefits, after reinsurance recoverable		$ 839	$ 673
Weighted average duration (years)		10 years 2 months 12 days	9 years 4 months 24 days
Whole Life Insurance | Segment Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Balance – beginning of period		$ 3,950	$ 2,308
Beginning balance at original discount rate				3,945	2,361
Effect of changes in cash flow assumptions				70	(1)
Effect of actual variances from expected experience				22	(8)
Adjusted beginning of period balance		4,037	2,352
Issuances		295	69
Interest accrual		27	18
Net premiums collected (1)	[2]	(310)	(82)
Other (including foreign exchange)		(4)	8
Ending balance at original discount rate		4,045	2,365
Effect of changes in discount rate assumptions		18	(8)
Balance – end of period		4,063	2,357
Balance – beginning of period		10,063	5,696
Beginning balance at original discount rate				9,991	5,874
Effect of changes in cash flow assumptions				86	(1)
Effect of actual variances from expected experience				27	(7)
Adjusted beginning of period balance		10,104	5,866
Issuances		295	69
Interest accrual		74	52
Benefits payments		(87)	(65)
Other (including foreign exchange)		(2)	28
Ending balance at original discount rate		10,384	5,950
Effect of changes in discount rate assumptions		184	(42)
Balance – end of period		10,568	5,908
Net liability for future policy benefits		6,505	3,551
Deferred profit liability		904	581
Net liability for future policy benefits, before reinsurance recoverable		7,409	4,132
Less: Reinsurance recoverable on future policy benefits		45	33
Net liability for future policy benefits, after reinsurance recoverable		$ 7,364	$ 4,099
Weighted average duration (years)		25 years 7 months 6 days	25 years 3 months 18 days
Accident and Health Insurance Product Line [Member] | Segment Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Balance – beginning of period		$ 10,432	$ 10,711
Beginning balance at original discount rate				10,692	11,258
Effect of changes in cash flow assumptions				109	(786)
Effect of actual variances from expected experience				(37)	(89)
Adjusted beginning of period balance		10,764	10,383
Issuances		697	288
Interest accrual		133	125
Net premiums collected (1)	[2]	(363)	(327)
Other (including foreign exchange)		82	(139)
Ending balance at original discount rate		11,313	10,330
Effect of changes in discount rate assumptions		(295)	(263)
Balance – end of period		11,018	10,067
Balance – beginning of period		14,650	15,038
Beginning balance at original discount rate				15,071	15,855
Effect of changes in cash flow assumptions				100	(798)
Effect of actual variances from expected experience				(36)	(87)
Adjusted beginning of period balance		15,135	14,970
Issuances		697	288
Interest accrual		164	156
Benefits payments		(398)	(362)
Other (including foreign exchange)		114	(153)
Ending balance at original discount rate		15,712	14,899
Effect of changes in discount rate assumptions		(487)	(463)
Balance – end of period		15,225	14,436
Net liability for future policy benefits		4,207	4,369
Deferred profit liability		174	135
Net liability for future policy benefits, before reinsurance recoverable		4,381	4,504
Less: Reinsurance recoverable on future policy benefits		113	112
Net liability for future policy benefits, after reinsurance recoverable		$ 4,268	$ 4,392
Weighted average duration (years)		10 years 1 month 6 days	10 years 8 months 12 days
Insurance, Other | Segment Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Balance – beginning of period		$ 64	$ 42
Beginning balance at original discount rate				64	43
Effect of changes in cash flow assumptions				0	1
Effect of actual variances from expected experience				0	(1)
Adjusted beginning of period balance		64	43
Issuances		2	1
Interest accrual		0	0
Net premiums collected (1)	[2]	(7)	(6)
Other (including foreign exchange)		0	1
Ending balance at original discount rate		59	39
Effect of changes in discount rate assumptions		0	0
Balance – end of period		59	39
Balance – beginning of period		495	269
Beginning balance at original discount rate				492	280
Effect of changes in cash flow assumptions				0	3
Effect of actual variances from expected experience				$ 0	$ (1)
Adjusted beginning of period balance		492	282
Issuances		2	1
Interest accrual		3	2
Benefits payments		(6)	(3)
Other (including foreign exchange)		21	(14)
Ending balance at original discount rate		512	268
Effect of changes in discount rate assumptions		18	0
Balance – end of period		530	268
Net liability for future policy benefits		471	229
Deferred profit liability		19	13
Net liability for future policy benefits, before reinsurance recoverable		490	242
Less: Reinsurance recoverable on future policy benefits		1	0
Net liability for future policy benefits, after reinsurance recoverable		$ 489	$ 242
Weighted average duration (years)		15 years 1 month 6 days	14 years 6 months
[1] Net of valuation allowance for uncollectible reinsurance. Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefit.

Future policy benefits (Undisco

Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Discounted expected future benefit payments	$ 28,622	$ 27,462	$ 23,052	$ 23,324
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	4,358		4,041
Undiscounted expected future gross premiums	7,291		6,452
Discounted expected future benefit payments	2,299	2,254	2,440	2,321
Discounted expected future gross premiums	3,909		3,773
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	24,834		16,446
Undiscounted expected future gross premiums	9,593		6,895
Discounted expected future benefit payments	10,568	10,063	5,908	5,696
Discounted expected future gross premiums	7,774		5,398
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	26,475		23,186
Undiscounted expected future gross premiums	39,002		33,809
Discounted expected future benefit payments	15,225	14,650	14,436	15,038
Discounted expected future gross premiums	22,975		20,766
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Undiscounted expected future benefit payments	901		342
Undiscounted expected future gross premiums	94		97
Discounted expected future benefit payments	530	$ 495	268	$ 269
Discounted expected future gross premiums	$ 83		$ 87

Future policy benefits (Premium

Future policy benefits (Premiums & interest) (Details) - Segment Life [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	$ 1,470	$ 1,140
Interest Accretion	86	71
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	167	160
Interest Accretion	5	4
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	530	230
Interest Accretion	47	34
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	753	733
Interest Accretion	31	31
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums or Assessments	20	17
Interest Accretion	$ 3	$ 2

Future policy benefits (Weighte

Future policy benefits (Weighted average interest rates) (Details) - Segment Life [Member]	Mar. 31, 2024	Mar. 31, 2023
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	2.90%	2.80%
Current Discount Rate	5.70%	5.70%
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	3.20%	4%
Current Discount Rate	4.50%	5.20%
Accident and Health Insurance Product Line [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	3.70%	3.80%
Current Discount Rate	6.30%	6.20%
Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Interest Accretion Rate	2.60%	3.80%
Current Discount Rate	3.80%	4.80%

Policyholders' account balanc_3

Policyholders' account balances (Policyholder Account Balance Rollforward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Balance – beginning of period		$ 6,880	$ 2,593	$ 6,789	$ 2,573
Policyholder Account Balance, Premium Received		334	68
Policyholder Account Balance, Policy Charge	[1]	(36)	(34)
Policyholder Account Balance, Surrender and Withdrawal		(119)	(23)
Policyholder Account Balance, Benefit Payment	[2]	(116)	(10)
Policyholder Account Balance, Interest Expense		43	16
Policyholder Account Balance, Increase (Decrease) from Other Change		(15)	(3)
Balance - end of period		6,880	2,593	6,789	2,573
Balance – beginning of period		680	585	673	567
Policyholder Account Balance, Ending Balance		7,560	3,178
Universal Life
Policyholder Account Balance [Line Items]
Balance – beginning of period		1,840	1,208	1,876	1,199
Policyholder Account Balance, Premium Received		72	50
Policyholder Account Balance, Policy Charge	[1]	(34)	(30)
Policyholder Account Balance, Surrender and Withdrawal		(32)	(15)
Policyholder Account Balance, Benefit Payment	[2]	(54)	(4)
Policyholder Account Balance, Interest Expense		13	8
Policyholder Account Balance, Increase (Decrease) from Other Change		(1)	0
Balance - end of period		1,840	1,208	1,876	1,199
Policyholder Account Balance, Ending Balance		$ 1,840	$ 1,208
Policyholder Account Balance, Weighted Average Crediting Rate		2.90%	2.60%
Policyholder Account Balance, Net Amount at Risk	[3]	$ 12,014	$ 11,394
Policyholder Account Balance, Cash Surrender Value		1,623	1,005
Annuities [Member]
Policyholder Account Balance [Line Items]
Balance – beginning of period	[4]	2,484		2,411
Policyholder Account Balance, Premium Received	[4]	131
Policyholder Account Balance, Policy Charge	[1],[4]	0
Policyholder Account Balance, Surrender and Withdrawal	[4]	(10)
Policyholder Account Balance, Benefit Payment	[2],[4]	(59)
Policyholder Account Balance, Interest Expense	[4]	16
Policyholder Account Balance, Increase (Decrease) from Other Change	[4]	(5)
Balance - end of period	[4]	2,484		2,411
Policyholder Account Balance, Ending Balance		$ 2,484
Policyholder Account Balance, Weighted Average Crediting Rate		2.60%
Policyholder Account Balance, Net Amount at Risk	[3]	$ 0
Policyholder Account Balance, Cash Surrender Value		1,605
Insurance, Other
Policyholder Account Balance [Line Items]
Balance – beginning of period	[5]	2,556	1,385	2,502	1,374
Policyholder Account Balance, Premium Received	[5]	131	18
Policyholder Account Balance, Policy Charge	[1],[5]	(2)	(4)
Policyholder Account Balance, Surrender and Withdrawal	[5]	(77)	(8)
Policyholder Account Balance, Benefit Payment	[2],[5]	(3)	(6)
Policyholder Account Balance, Interest Expense	[5]	14	8
Policyholder Account Balance, Increase (Decrease) from Other Change	[5]	(9)	(3)
Balance - end of period	[5]	2,556	1,385	$ 2,502	$ 1,374
Policyholder Account Balance, Ending Balance		$ 2,556	$ 1,385
Policyholder Account Balance, Weighted Average Crediting Rate		2.50%	3%
Policyholder Account Balance, Net Amount at Risk	[3]	$ 499	$ 156
Policyholder Account Balance, Cash Surrender Value		$ 2,239	$ 1,075
[1] Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance. Includes benefit payments upon maturity as well as death benefits. For those guarantees of benefits that are payable in the event of death, the net amount at risk is defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date. Relates to Huatai Life. Other primarily comprises policyholder account balances related to investment linked products including endowment and investment contracts, none of which bear significant insurance risk.

Policyholders' account balanc_4

Policyholders' account balances (Guaranteed Minimum Crediting Rates) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	$ 7,560	$ 7,462	$ 3,178
Universal Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,840		1,208
Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	563		544
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	461		345
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	767		312
Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	49		7
Annuities [Member]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	2,484
Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	859
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,624
Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1
Insurance, Other
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	2,556		1,385
Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,167		835
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	613		43
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	243		212
Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	533		295
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	570		494
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	482		455
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	39		32
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	49		7
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	2,345
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	720
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,624
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,565		953
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	789		446
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	243		212
Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	533		295
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	1,256		694
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	67		69
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	461		345
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	728		280
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	139
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	139
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	991		427
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	378		384
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	613		43
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400 | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	14		20
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	14		20
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Universal Life | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Annuities [Member] | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		5
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, at Guaranteed Minimum Crediting Rate
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		5
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	0		0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater | Insurance, Other | Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance	$ 0		$ 0
Minimum | Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate	2.01%
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate	4%
Maximum | Policyholder account balance, guaranteed minimum credit rating, range from 0000 to 0200
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate	2%
Maximum | Policyholder account balance, guaranteed minimum credit rating, range from 0201 to 0400
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Crediting Rate	4%

Separate accounts (Fair value o

Separate accounts (Fair value of assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 5,864	$ 5,573	$ 5,300
Separate Account, Cash and Cash Equivalents
Fair Value, Separate Account Investment [Line Items]
Separate account assets	76		116
Fixed maturities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	89		102
Mutual funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 5,699		$ 5,082

Separate accounts (Separate acc

Separate accounts (Separate account liabilities rollforward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Separate Account, Liability [Line Items]
Separate Account, Liability, Beginning Balance		$ 5,573	$ 5,190
Separate Account, Liability, Premium and Deposit		264	266
Separate Account, Liability, Policy Charge		(43)	(35)
Separate Account, Liability, Surrender and Withdrawal		(210)	(111)
Separate Account, Liability, Benefit Payment		(105)	(99)
Separate Account, Liability, Increase (Decrease) from Invested Performance		375	110
Separate Account, Liability, Increase (Decrease) from Other Change		10	(21)
Separate Account, Liability, Ending Balance		5,864	5,300
Separate Account, Liability, Cash Surrender Value, Amount	[1]	$ 5,655	$ 5,030
[1] Cash surrender value represents the amount of the contract holder's account balances distributable at the balance sheet date less certain surrender charges.

Unearned revenue liability (URL

Unearned revenue liability (URL Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Insurance [Abstract]
Balance – beginning of period	$ 680	$ 585	$ 673	$ 567
Deferred revenue	34	32
Amortization	(18)	(14)
Other (including foreign exchange)	(9)	0
Balance – end of period	$ 680	$ 585	$ 673	$ 567

Market risk benefits (MRB Roll-

Market risk benefits (MRB Roll-Forward) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Market Risk Benefit [Line Items]
Market Risk Benefit, Liability, beginning of period		$ 771
Market Risk Benefit, Liability, end of period		611
Market risk benefits gains (losses)		21	$ (115)
Long-Duration Insurance, Other | Variable Annuity
Market Risk Benefit [Line Items]
Market Risk Benefit, Liability, beginning of period		771	800
Balance, beginning of period, before effect of changes in the instrument-specific credit risk		749	776
Interest rate changes		(57)	63
Effect of changes in equity markets		(77)	(75)
Effect of changes in volatilities		(20)	57
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected		30	(2)
Effect of timing and all other		(31)	(16)
Balance, end of period, before effect of changes in the instrument-specific credit risk		594	803
Effect of changes in the instrument-specific credit risk		17	27
Market Risk Benefit, Liability, end of period		611	830
Market Risk Benefit, Net Amount at Risk	[1]	1,683	2,296
Market Risk Benefits Other Gains (Losses)		$ (134)	$ (89)
Weighted-average age of policyholders (years)		74 years	73 years
[1] The net amount at risk is defined as the present value of future claim payments assuming policy account values and guaranteed values are fixed at the valuation date, and reinsurance coverage ends at the earlier of the maturity of the underlying variable annuity policy or the reinsurance treaty. No withdrawals, lapses, and mortality improvements are assumed in the projection. GLB-related risks contain conservative mortality and annuitization assumptions.

Market Risk Benefits (MRB Valua

Market Risk Benefits (MRB Valuation) (Details)		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate		0.50%	0.50%
Significant Unobservable Inputs Annuitization Rate		0%	0%
Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate		30%	30.40%
Significant Unobservable Inputs Annuitization Rate		100%	100%
Weighted Average
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate	[1]	4.30%	4%
Significant Unobservable Inputs Annuitization Rate	[1]	4.20%	4.40%
[1] The weighted-average lapse and annuitization rates are determined by weighting each treaty's rates by the MRB contract's fair value.

Debt (Detail)

Debt (Detail) - Senior Notes [Member] - INA Senior Notes Due March 2034 [Domain] $ in Billions	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1
Debt Instrument, Interest Rate, Stated Percentage	5%
Make Whole Premium Additional Percent	0.15%

Commitments, Contingencies, A_3

Commitments, Contingencies, And Guarantees (Narrative) (Detail) € in Millions, $ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]
Hedged Liability, Fair Value Hedge	$ 1,600	€ 1,500
Repurchase agreements	3,022		$ 2,833
Purchase Commitment, Remaining Minimum Amount Committed	1,000		1,000
Carrying value of limited partnerships and partially-owned investment companies included in other investments	14,000		13,900
Funding commitments relating to limited partnerships and partially-owned investment companies	5,900		6,200
Unrecognized tax benefits	73
Operating Lease, Right-of-Use Asset	762		784
Operating Lease, Liability	$ 818		$ 832
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities	Other liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets (includes VIE balances of $14 and $33)	Other assets (includes VIE balances of $14 and $33)	Other assets (includes VIE balances of $14 and $33)
Derivative Liability, Subject to Master Netting Arrangement, after Offset	$ 104		$ 115

Commitments, Contingencies, A_4

Commitments, Contingencies, And Guarantees (Balance Sheet Locations, Fair Values In Asset Or (Liability) Position, And Notional Values/Payment Provisions Of Derivative Instruments) (Detail) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		$ 3,647	$ 3,662
Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,746	2,062
Convertible securities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[1]	69	64
Investment And Embedded Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		92	110
Fair Value, Liability		(144)	(136)
Derivative, Notional Amount		5,462	5,788
Futures contracts on equities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	1,162	1,157
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		149	136
Fair Value, Liability		(110)	128
Derivative, Notional Amount		3,267	3,250
Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,642	1,631
Net Investment Hedging
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,625	1,619
Other derivative instruments
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		269	217
Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		1,431	1,374
Other Assets [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		23	27
Other Assets [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5	27
Other Assets [Member] | Futures contracts on equities
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[2]	0	0
Other Assets [Member] | Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		133	126
Other Assets [Member] | Net Investment Hedging
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		16	10
Other Assets [Member] | Other derivative instruments
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1	0
Other Assets [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1	0
Fixed Maturities [Member] | Convertible securities
Derivatives, Fair Value [Line Items]
Derivative Asset, Not Subject to Master Netting Arrangement	[1]	64	56
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(135)	(94)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Options/Futures contracts on notes and bonds
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(9)	(42)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Futures contracts on equities
Derivatives, Fair Value [Line Items]
Fair Value, Liability	[2]	(22)	(37)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Fair Value Hedging
Derivatives, Fair Value [Line Items]
Fair Value, Liability		0	0
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Net Investment Hedging
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(110)	(128)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other derivative instruments
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(6)	(5)
Accounts Payable, Accrued Expenses, And Other Liabilities [Member] | Other Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Liability		(28)	(42)
Equity Securities | Convertible securities
Derivatives, Fair Value [Line Items]
Derivative Liability, Not Subject to Master Netting Arrangement	[1]	$ 0	$ 0
[1] Includes fair value of embedded derivatives. Related to MRB book of business.

Commitment, Contingencies, And

Commitment, Contingencies, And Guarantees (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]
Interest expense reclassified from OCI	$ 178	$ 160
Fair Value Hedging
Financial Instruments Owned and Pledged as Collateral [Line Items]
Gain (loss) recognized in OCI	(8)	(17)
Net realized gain (loss) reclassified from OCI	(37)	20
Interest expense reclassified from OCI	(4)	(4)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	$ 33	$ (33)

Commitments, Contingencies, A_5

Commitments, Contingencies, And Guarantees (Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location) (Details) - Net Investment Hedging - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]
Gain (loss) recognized in OCI	$ 36	$ (23)
Interest income reclassified from OCI	3	3
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	$ 33	$ (26)

Commitments, Contingencies, A_6

Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		$ (140)	$ (104)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(52)	(51)
All Other Futures Contracts, Options and equities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		6	5
Convertible securities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[1]	3	0
Investment And Embedded Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(43)	(46)
Futures contracts on equities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative	[2]	(95)	(57)
Other Derivative Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		(97)	(58)
Other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Derivative		$ (2)	$ (1)
[1] Includes embedded derivatives. Related to MRB book of business.

Commitments, contingencies, a_7

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Transactions accounted for as secured borrowings) (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 1,708	$ 1,299
Securities lending payable	1,708	1,299
Cash [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	698	555
U.S. Treasury / Agency | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	275	33
Foreign [Member] | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	654	621
Corporate and asset-backed securities | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	60	57
Equity Securities | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	17	27
Municipal | Overnight and Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Securities lending collateral	$ 4	$ 6

Commitments, contingencies, a_8

Commitments, contingencies, and guarantees Commitments, Contingencies, And Guarantees (Collateral pledged under repurchase agreements) (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements		$ 3,022	$ 2,833
Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		3,097	2,924
Cash [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		4	34
U.S. Treasury / Agency | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		100	105
Mortgage-backed securities | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,414	1,430
Repurchase Agreements [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Secured Borrowings, Gross, Difference, Amount	[1]	75	91
Non-US [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,579	1,355
Maturity Less than 30 Days [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		2,067	1,355
Maturity Less than 30 Days [Member] | Cash [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		0	0
Maturity Less than 30 Days [Member] | U.S. Treasury / Agency | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		0	0
Maturity Less than 30 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		488	0
Maturity Less than 30 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,579	1,355
Maturity 30 to 90 Days [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		1,030	1,051
Maturity 30 to 90 Days [Member] | Cash [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		4	33
Maturity 30 to 90 Days [Member] | U.S. Treasury / Agency | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		100	105
Maturity 30 to 90 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		926	913
Maturity 30 to 90 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements		$ 0	0
Maturity Greater than 90 Days [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements			518
Maturity Greater than 90 Days [Member] | Cash [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements			1
Maturity Greater than 90 Days [Member] | U.S. Treasury / Agency | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements			0
Maturity Greater than 90 Days [Member] | Mortgage-backed securities | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements			517
Maturity Greater than 90 Days [Member] | Non-US [Member] | Asset Pledged as Collateral without Right
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Assets pledged under repurchase agreements			$ 0
[1] Per the repurchase agreements, the amount of collateral posted is required to exceed the amount of gross liability.

Shareholders' equity (Details)

Shareholders' equity (Details)		3 Months Ended
	May 22, 2023 shares	Mar. 31, 2024 SFr / shares shares	Dec. 31, 2023 SFr / shares shares	May 17, 2023 $ / shares	May 19, 2022 $ / shares
Stockholders' Equity Note [Abstract]
Common Shares, par value | SFr / shares		SFr 0.50	SFr 0.50
Treasury Stock, Shares, Retired	14,925,028	14,925,028
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		1,983,550
Common Stock, Dividend Rate Approved | $ / shares				$ 0.86	$ 0.83
Annual dividend per share approved by shareholders | $ / shares				3.44	3.32
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividend Rate Approved | $ / shares				$ 0.86	$ 0.83
Treasury Stock, Shares, Retired	14,925,028	14,925,028
Treasury Stock, Common, Shares		25,418,520	26,181,949
Common Shares, par value | SFr / shares		SFr 0.50	SFr 0.50

Shareholders' equity Dividends

Shareholders' equity Dividends Declared (Details)	3 Months Ended
	Mar. 31, 2024 $ / shares	Mar. 31, 2024 SFr / shares	Mar. 31, 2023 $ / shares	Mar. 31, 2023 SFr / shares
United States of America, Dollars
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.86		$ 0.83
Switzerland, Francs
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | SFr / shares		SFr 0.75		SFr 0.77

Shareholders' equity Share Repu

Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 25, 2024	Mar. 31, 2024	Mar. 31, 2023	Jul. 01, 2023	May 19, 2022
May 2022 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 2,500
Number of shares repurchased			2,010,400
Cost of shares repurchased			$ 428
Repurchase authorization remaining at end of period			$ 1,193
July 2023 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 5,000
Number of shares repurchased		1,220,121
Cost of shares repurchased		$ 316
Repurchase authorization remaining at end of period		$ 3,373
Subsequent Event [Member] | July 2023 Stock Repurchase Plan
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	250,000
Cost of shares repurchased	$ 62
Repurchase authorization remaining at end of period	$ 3,312

Shareholders' equity AOCI (Deta

Shareholders' equity AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	$ 59,507
Other comprehensive income (loss), before income tax	(614)	$ 1,422
Other Comprehensive Income (Loss), Tax	(9)	132
Other Comprehensive Income (Loss), Net of Tax	(605)	1,290
Balance – end of period, net of tax	60,535	52,987
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	(4,177)	(7,279)
Balance – end of period, net of tax	(4,825)	(5,659)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(796)	1,606
Net Realized Gains (Losses) Reclassified from AOCI	(119)	(180)
Other comprehensive income (loss), before income tax	(677)	1,786
Other Comprehensive Income (Loss), Tax	(42)	166
Other Comprehensive Income (Loss), Net of Tax	(635)	1,620
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	13	0
AOCI, Liability for Future Policy Benefit, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	51	(75)
Balance – end of period, net of tax	11	(205)
AOCI, Liability for Future Policy Benefit, Including Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), before income tax	(53)	(151)
Other Comprehensive Income (Loss), Tax	20	(21)
Other Comprehensive Income (Loss), Net of Tax	(73)	(130)
AOCI, Liability for Future Policy Benefit, Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	(33)	0
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	(22)	(24)
Balance – end of period, net of tax	(17)	(27)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Including Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	5	(3)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	0	0
Cumulative Foreign Currency Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	(2,945)	(2,966)
Balance – end of period, net of tax	(2,864)	(3,136)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	83	(174)
Net Realized Gains (Losses) Reclassified from AOCI	3	3
Other comprehensive income (loss), before income tax	80	(177)
Other Comprehensive Income (Loss), Tax	7	(7)
Other Comprehensive Income (Loss), Net of Tax	73	(170)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	(8)	0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	(13)	(66)
Balance – end of period, net of tax	13	(92)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(8)	(17)
Net Realized Gains (Losses) Reclassified from AOCI	(41)	16
Other comprehensive income (loss), before income tax	33	(33)
Other Comprehensive Income (Loss), Tax	7	(7)
Other Comprehensive Income (Loss), Net of Tax	26	(26)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	0	0
Postretirement Benefit Liability Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	297	225
Balance – end of period, net of tax	296	224
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), before income tax	(2)	0
Other Comprehensive Income (Loss), Tax	(1)	1
Other Comprehensive Income (Loss), Net of Tax	(1)	(1)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax	0	0
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance – beginning of period, net of tax	(6,809)	(10,185)
Other Comprehensive Income (Loss), Net of Tax	(577)	1,290
Balance – end of period, net of tax	$ (7,386)	$ (8,895)

Shareholders' equity AOCI Recla

Shareholders' equity AOCI Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Interest expense	$ 178	$ 160
Income Tax (Expense) Benefit	(342)	(384)
Net income (loss)	2,143	1,892
Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Net income (loss)	(137)	(147)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Debt Securities, Available-for-sale, Realized Gain	(119)	(180)
Income Tax (Expense) Benefit	(12)	(18)
Net income (loss)	(107)	(162)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Foreign Currency Transaction Gain (Loss), Realized	(37)	20
Interest expense	(4)	(4)
Income Tax (Expense) Benefit	(9)	3
Net income (loss)	(32)	13
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income
Equity, Class of Treasury Stock [Line Items]
Interest expense	3	3
Income Tax (Expense) Benefit	1	1
Net income (loss)	$ 2	$ 2

Share-Based Compensation (Detai

Share-Based Compensation (Detail) - $ / shares		3 Months Ended
	Feb. 26, 2024	Mar. 31, 2024
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period		3 years
Award term period in years		10 years
Stock options granted	1,359,237
Weighted-average grant date fair value for stock options granted	$ 64.15
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		4 years
Restricted stock awards granted to employees and officers of the company	685,665
Grant date fair value of awards except for options granted to employees and officers of the company	$ 254.84
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		3 years
Restricted stock awards granted to employees and officers of the company	107,644
Grant date fair value of awards except for options granted to employees and officers of the company	$ 254.84
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		4 years
Restricted stock awards granted to employees and officers of the company	290,085
Grant date fair value of awards except for options granted to employees and officers of the company	$ 254.84
PerformanceBasedStockUnits(PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period in years		3 years
Restricted stock awards granted to employees and officers of the company	277,883
Grant date fair value of awards except for options granted to employees and officers of the company	$ 254.84

Postretirement benefits Compone

Postretirement benefits Components of net periodic benefit costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	$ 2	$ 2
Non-service (benefit) cost	(31)	(25)
Net periodic benefit cost (benefit)	(29)	(23)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	0	0
Interest cost	1	0
Expected return on plan assets	(1)	(1)
Defined Benefit Plan, Amortization of Gain (Loss)	(1)	0
Amortization of prior service cost	0	0
Settlements	0	0
Non-service (benefit) cost	(1)	(1)
Net periodic benefit cost (benefit)	(1)	(1)
Losses and loss expenses | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	0	0
Non-service (benefit) cost	(3)	(2)
Losses and loss expenses | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	0	0
Non-service (benefit) cost	0	0
Administrative Expense | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	2	2
Non-service (benefit) cost	(28)	(23)
Administrative Expense | Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	0	0
Non-service (benefit) cost	(1)	(1)
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	2	2
Interest cost	9	9
Expected return on plan assets	(13)	(12)
Defined Benefit Plan, Amortization of Gain (Loss)	1	0
Amortization of prior service cost	0	0
Settlements	0	0
Non-service (benefit) cost	(3)	(3)
Net periodic benefit cost (benefit)	(1)	(1)
UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Service cost	0	0
Interest cost	33	34
Expected return on plan assets	(61)	(56)
Defined Benefit Plan, Amortization of Gain (Loss)	0	0
Amortization of prior service cost	0	0
Settlements	0	0
Non-service (benefit) cost	(28)	(22)
Net periodic benefit cost (benefit)	$ (28)	$ (22)

Other Income and Expense (Detai

Other Income and Expense (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Equity in net income (loss) of partially-owned entities		$ 184	$ 340
Gains (losses) from fair value changes in separate account assets (1)	[1]	10	(25)
Asset management and performance fee revenue		53	0
Asset management and performance fee expense		(33)	0
Federal excise and capital taxes		(4)	(5)
Other		(19)	(14)
Total		191	296
Partially-owned Investment Companies
Unrealized Gain (Loss) on Investments		$ 103	242
Huatai Group
Equity in net income (loss) of partially-owned entities			$ 14
[1] Related to gains (losses) from fair value changes in separate account assets that do not qualify for separate account reporting under U.S. GAAP.

Segment information (Details)

Segment information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net premiums written	$ 12,221	$ 10,710
Net premiums earned	11,583	10,142
Losses and loss expenses	5,727	5,148
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	1,180	797
Policy acquisition costs	2,207	1,948
Administrative expenses	1,070	930
Underwriting income (loss)	1,399	1,319
Net investment income (loss)	1,391	1,107
Other (income) expense	(191)	(296)
Amortization of purchased intangibles	80	72
Segment Income (loss)	2,901	2,650
Net realized gains (losses)	(101)	(77)
Market risk benefits gains (losses)	21	(115)
Interest Income (Expense), Net	178	160
Cigna integration expenses	7	22
Income tax expense	342	384
Net Income	2,294	1,892
Net income attributable to noncontrolling interests	151	0
Net income (loss)	2,143	1,892
North America Commercial P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	4,689	4,288
Net premiums earned	4,880	4,369
Losses and loss expenses	3,175	2,729
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	0	0
Policy acquisition costs	688	613
Administrative expenses	328	295
Underwriting income (loss)	689	732
Net investment income (loss)	826	698
Other (income) expense	7	7
Amortization of purchased intangibles	0	0
Segment Income (loss)	1,508	1,423
North American Personal P&C Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,456	1,296
Net premiums earned	1,471	1,320
Losses and loss expenses	899	888
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	0	0
Policy acquisition costs	300	272
Administrative expenses	86	79
Underwriting income (loss)	186	81
Net investment income (loss)	102	82
Other (income) expense	1	1
Amortization of purchased intangibles	2	2
Segment Income (loss)	285	160
North America Agricultural Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	249	293
Net premiums earned	128	159
Losses and loss expenses	49	140
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	0	0
Policy acquisition costs	21	15
Administrative expenses	2	3
Underwriting income (loss)	56	1
Net investment income (loss)	21	17
Other (income) expense	0	1
Amortization of purchased intangibles	6	6
Segment Income (loss)	71	11
Overseas General Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	3,835	3,263
Net premiums earned	3,198	2,786
Losses and loss expenses	1,426	1,237
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	100	110
Policy acquisition costs	823	713
Administrative expenses	331	280
Underwriting income (loss)	518	446
Net investment income (loss)	267	188
Other (income) expense	5	(9)
Amortization of purchased intangibles	20	18
Segment Income (loss)	760	625
Global Reinsurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	359	277
Net premiums earned	295	244
Losses and loss expenses	137	112
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	0	0
Policy acquisition costs	81	62
Administrative expenses	9	9
Underwriting income (loss)	68	61
Net investment income (loss)	57	49
Other (income) expense	0	(1)
Amortization of purchased intangibles	0	0
Segment Income (loss)	125	111
Life Insurance [Member]
Segment Reporting Information [Line Items]
Net premiums written	1,633	1,293
Net premiums earned	1,611	1,264
Losses and loss expenses	32	32
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	1,070	712
Policy acquisition costs	294	273
Administrative expenses	207	167
Underwriting income (loss)	8	80
Net investment income (loss)	230	153
Other (income) expense	(40)	(15)
Amortization of purchased intangibles	10	4
Segment Income (loss)	268	244
Segment Corporate and Other
Segment Reporting Information [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Losses and loss expenses	10	11
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	0	0
Policy acquisition costs	0	0
Administrative expenses	107	97
Underwriting income (loss)	(117)	(108)
Net investment income (loss)	(26)	11
Other (income) expense	(68)	(214)
Amortization of purchased intangibles	42	42
Segment Income (loss)	(117)	75
Net realized gains (losses)	(100)	(76)
Market risk benefits gains (losses)	21	(115)
Interest Income (Expense), Net	178	160
Cigna integration expenses	7	22
Income tax expense	342	384
Net Income	(723)	(682)
Net income attributable to noncontrolling interests	151
Net income (loss)	(874)
Segment Measure Reconciling Items
Segment Reporting Information [Line Items]
Net premiums written	0	0
Net premiums earned	0	0
Losses and loss expenses	(1)	(1)
Policy benefits (includes remeasurement gains (losses) of $(19) and $1)	10	(25)
Policy acquisition costs	0	0
Administrative expenses		0
Underwriting income (loss)	(9)	26
Net investment income (loss)	(86)	(91)
Other (income) expense	(96)	(66)
Amortization of purchased intangibles	0	0
Segment Income (loss)	1	1
Net realized gains (losses)	(1)	(1)
Market risk benefits gains (losses)	0	0
Interest Income (Expense), Net	0	0
Cigna integration expenses	0	0
Income tax expense	0	0
Net Income	0	$ 0
Net income attributable to noncontrolling interests	0
Net income (loss)	$ 0

Earnings Per Share (Detail)

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 2,294	$ 1,892
Net income attributable to noncontrolling interests	151	0
Net income (loss)	$ 2,143	$ 1,892
Weighted-average shares outstanding	405,662,694	414,289,150
Share-based compensation plans	4,076,941	3,639,042
Weighted-average shares outstanding and assumed conversions	409,739,635	417,928,192
Basic earnings (loss) per share (US$ per share)	$ 5.28	$ 4.57
Diluted earnings (loss) per share (US$ per share)	$ 5.23	$ 4.53
Potential anti-dilutive share conversions	1,005,420	1,731,523