Consolidated Balance Sheets (Parentheticals) $ in Millions	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Statement of Financial Position [Abstract]
Short-term investments amortized cost	$ 5,143	$ 4,551
Fixed maturities, available-for-sale, valuation allowance	70	156
Fixed maturities, available-for-sale, at amortized cost	115,083	111,128
Private debt, held-for-investment, valuation allowance	4	4
Restricted Cash	261	172
Insurance and reinsurance balances receivable, Allowance for Credit Losses	59	53
Valuation allowance for uncollectible reinsurance	$ 310	$ 367
Common Shares, shares issued | shares	419,625,986	431,451,586
Common Shares, shares outstanding | shares	400,703,663	405,269,637
Treasury Stock, Common, Shares | shares	18,922,323	26,181,949
Short-term investments	$ 5,142	$ 4,551
Equity securities	9,151	3,455
Private equities	14,769	14,078
Other investments	8,597	5,527
Cash, including restricted cash	2,549	2,621
Other assets	7,503	7,508
Repurchase agreements	2,731	2,833
Noncontrolling interests	4,373	4,184
Variable Interest Entity, Primary Beneficiary
Short-term investments	57	217
Equity securities	1,289	1,078
Private equities	22	21
Other investments	4,538	3,773
Cash, including restricted cash	114	117
Other assets	26	33
Other liabilities	183	18
Repurchase agreements	815	1,009
Noncontrolling interests	$ 3,459	$ 2,705