Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Adjustments to reconcile net income to net cash flows from operating activities
Net Realized Gains Losses	$ (117)	$ 607	$ 1,085
Accretion (Amortization) of Discounts and Premiums, Investments	(367)	(148)	189
Amortization of purchased intangibles	323	310	285
Deferred income taxes	96	(1,124)	318
Equity in net income of subsidiaries and affiliates	(967)	(867)	(1)
Unpaid losses and loss expenses	4,567	3,470	4,259
Unearned premiums	1,805	1,377	1,435
Future policy benefits	1,841	848	333
Insurance and reinsurance balances payable	(105)	(155)	446
Accounts payable, accrued expenses, and other liabilities	342	(735)	(68)
Income taxes	69	128	(149)
Insurance and reinsurance balances receivable	(1,278)	(1,072)	(696)
Reinsurance recoverable	(30)	(498)	(1,737)
Deferred policy acquisition costs	(1,429)	(1,100)	(396)
Net sales of investments by consolidated investment products	278	450	0
Other	1,374	1,819	789
Net Cash Provided by (Used) in Operating Activities, Total	16,182	12,632	11,258
Cash flows from investing activities
Purchases of fixed maturities available-for-sale	(33,759)	(28,672)	(27,844)
Purchases of fixed maturities held-to-maturity	0	(208)	(618)
Purchases of equity securities	(4,333)	(1,395)	(895)
Sales of fixed maturities available-for-sale	12,815	14,593	16,855
Sales of equity securities	2,996	1,084	4,615
Maturities and redemptions of fixed maturities available-for-sale	10,810	7,026	9,415
Maturities and redemptions of fixed maturities held-to-maturity	0	708	1,712
Net change in short-term investments	(763)	1,169	(1,452)
Net derivative instruments settlements	(93)	(153)	(84)
Private equity contributions	(1,070)	(2,024)	(2,649)
Private equity distributions	1,397	1,164	1,017
Acquisition of subsidiaries (net of cash acquired of nil, $560, and $366)	(538)	(34)	(5,166)
Cash And Cash Equivalents Increase (Decrease) Due To Consolidation And Deconsolidation Of Investment Products	27	(17)	0
Other	(1,412)	(889)	(560)
Net Cash Provided by (Used in) Investing Activities	(13,923)	(7,648)	(5,654)
Cash flows from financing activities
Dividends paid on Common Shares	(1,436)	(1,394)	(1,375)
Common Shares repurchased	(1,801)	(2,411)	(2,894)
Proceeds from issuance of long-term debt	2,408	0	0
Proceeds from issuance of repurchase agreements	4,505	4,984	4,510
Repayments of Long-term Debt	(1,437)	(475)	(1,000)
Repayment of repurchase agreements	(4,822)	(4,728)	(4,508)
Proceeds from share-based compensation plans	356	212	264
Policyholder contract deposits	1,024	645	488
Policyholder contract withdrawals	(709)	(458)	(521)
Third-party capital invested into consolidated investment products	1,614	126	0
Third-party capital distributed by consolidated investment products	(1,621)	(745)	0
Tax withholding payments for share-based compensation plans	(262)	(245)	(106)
Net cash flows (used for) from financing activities	(2,181)	(4,489)	(5,142)
Effect of foreign currency rate changes on cash and restricted cash	(150)	(1)	(146)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(72)	494	316
Cash and restricted cash - beginning of year	2,621	2,127	1,811
Cash and restricted cash - end of year	2,549	2,621	2,127
Supplemental cash flow information
Taxes paid	1,662	1,465	1,242
Interest paid	599	553	552
Market Risk Benefit, Change in Fair Value, Gain (Loss)	140	307	(80)
Net income	$ 9,640	$ 9,015	$ 5,246