Consolidated Balance Sheets (Parentheticals) $ in Millions	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($) shares
Statement of Financial Position [Abstract]
Short-term investments amortized cost	$ 4,840	$ 5,143
Fixed maturities, available-for-sale, valuation allowance	52	70
Fixed maturities, available-for-sale, at amortized cost	124,726	115,083
Private debt, held-for-investment, valuation allowance	3	4
Restricted Cash	198	261
Insurance and reinsurance balances receivable, Allowance for Credit Losses	62	59
Valuation allowance for uncollectible reinsurance	$ 320	$ 310
Common Shares, shares issued | shares	412,107,421	419,625,986
Common Stock, Shares Authorized | shares	412,107,421	419,625,986
Common Shares, shares outstanding | shares	391,101,227	400,703,663
Treasury Stock, Common, Shares | shares	21,006,194	18,922,323
Short-term investments	$ 4,840	$ 5,142
Equity securities	10,801	9,151
Private equities	17,239	14,769
Other investments	10,749	8,597
Cash, including restricted cash	2,470	2,549
Other assets	9,222	7,503
Repurchase agreements	3,324	2,731
Noncontrolling interests	6,022	4,373
Variable Interest Entity, Primary Beneficiary
Short-term investments	105	57
Equity securities	2,275	1,289
Private equities	22	22
Other investments	5,818	4,538
Cash, including restricted cash	168	114
Other assets	58	26
Repurchase agreements	956	815
Other liabilities	159	183
Noncontrolling interests	$ 5,133	$ 3,459