Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net income	$ 1,343	$ 2,294
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	116	101
Market risk benefits (gains) losses	92	(21)
Amortization of premiums (discounts) on fixed maturities	(100)	(80)
Amortization of purchased intangibles	75	80
Equity in net income (loss) of partially-owned entities	(82)	(184)
Deferred income taxes	(198)	(24)
Unpaid losses and loss expenses	1,182	175
Unearned premiums	868	633
Future policy benefits	440	445
Insurance and reinsurance balances payable	305	155
Accounts payable, accrued expenses, and other liabilities	(567)	(267)
Income taxes	203	257
Insurance and reinsurance balances receivable	(874)	(586)
Reinsurance recoverable	(127)	852
Deferred policy acquisition costs	(428)	(390)
Net sales (purchases) of investments by consolidated investment products	(435)	(404)
Other	(247)	184
Net cash flows from operating activities	1,566	3,220
Cash flows from investing activities
Purchases of fixed maturities available-for-sale	(5,894)	(8,617)
Purchases of equity securities	(783)	(752)
Sales of fixed maturities available-for-sale	2,660	4,368
Sales of equity securities	637	520
Maturities and redemptions of fixed maturities available-for-sale	2,902	2,149
Net change in short-term investments	773	(708)
Net derivative instruments settlements	(21)	(17)
Private equity contributions	(879)	(248)
Private equity distributions	222	177
Acquisition of subsidiaries	0	(236)
Cash And Cash Equivalents Increase (Decrease) Due To Consolidation And Deconsolidation Of Investment Products	16	0
Other	(431)	(382)
Net cash flows used for investing activities	(798)	(3,746)
Cash flows from financing activities
Proceeds from issuance of long-term debt	0	996
Dividends paid on Common Shares	(366)	(349)
Common Shares repurchased	(691)	(404)
Repayment of long-term debt	(800)	0
Proceeds from share-based compensation plans	98	163
Policyholder contract deposits	242	336
Policyholder contract withdrawals	(176)	(245)
Third-party capital invested into consolidated investment products	559	509
Third-party capital distributed by consolidated investment products	(242)	(413)
Proceeds from issuance of repurchase agreements	(810)	(1,062)
Repayment of repurchase agreements	(447)	(984)
Other	(112)	(109)
Net cash flows from (used for) financing activities	(1,125)	562
Effect of foreign currency rate changes on cash and restricted cash	58	(6)
Net increase (decrease) in cash and restricted cash	(299)	30
Cash and restricted cash - beginning of period	2,549	2,621
Cash and restricted cash - end of period	2,250	2,651
Supplemental cash flow information
Taxes paid	314	89
Interest paid	$ 146	$ 112