Consolidated Balance Sheets (Parentheticals) $ in Millions	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Statement of Financial Position [Abstract]
Short-term investments amortized cost	$ 4,551	$ 4,962
Fixed maturities, available-for-sale, valuation allowance	156	169
Fixed maturities, available-for-sale, at amortized cost	111,128	93,355
Fixed maturities, held-to-maturity, valuation allowance	0	34
Fixed maturities, held-to-maturity, fair value	0	8,439
Private debt held for investment, valuation allowance	4	0
Restricted Cash	172	115
Premium Receivable, Allowance for Credit Loss	53	52
Valuation allowance for uncollectible reinsurance	$ 367	$ 351
Common Shares, shares issued | shares	431,451,586	446,376,614
Common Shares, shares outstanding | shares	405,269,637	414,594,856
Treasury Stock, Common, Shares | shares	26,181,949	31,781,758
Short-term investments	$ 4,551	$ 4,960
Equity securities	3,455	827
Private equities	14,078	12,355
Other investments	5,527	1,341
Cash, including restricted cash	2,621	2,127
Other assets	7,317	7,546
Repurchase agreements	2,833	1,419
Noncontrolling interests	4,184	0
Variable Interest Entity, Primary Beneficiary
Short-term investments	217	0
Equity securities	1,078	0
Private equities	21	0
Other investments	3,773	0
Cash, including restricted cash	117	0
Other assets	33	0
Other liabilities	18	0
Repurchase agreements	1,009	0
Noncontrolling interests	2,705	$ 0
Variable Interest Entity, Primary Beneficiary | Huatai Group [Member]
Repurchase agreements	$ 1,000