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Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	$ 87,555	$ 87,131
Fixed maturity securities, allowance for credit losses	27	21
Fixed maturity securities, gross unrealized gains	724	1,037
Fixed maturity securities, gross unrealized losses	7,778	7,156
Fixed maturity securities, estimated fair value	80,474	80,991
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	39,447	38,778
Fixed maturity securities, allowance for credit losses	15	15
Fixed maturity securities, gross unrealized gains	278	388
Fixed maturity securities, gross unrealized losses	3,773	3,396
Fixed maturity securities, estimated fair value	35,937	35,755
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	13,125	12,865
Fixed maturity securities, allowance for credit losses	4	0
Fixed maturity securities, gross unrealized gains	59	89
Fixed maturity securities, gross unrealized losses	1,421	1,289
Fixed maturity securities, estimated fair value	11,759	11,665
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,066	8,656
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	153	286
Fixed maturity securities, gross unrealized losses	586	523
Fixed maturity securities, estimated fair value	7,633	8,419
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	8,339	8,199
Fixed maturity securities, allowance for credit losses	5	5
Fixed maturity securities, gross unrealized gains	42	48
Fixed maturity securities, gross unrealized losses	914	812
Fixed maturity securities, estimated fair value	7,462	7,430
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	7,005	7,023
Fixed maturity securities, allowance for credit losses	3	1
Fixed maturity securities, gross unrealized gains	4	2
Fixed maturity securities, gross unrealized losses	552	614
Fixed maturity securities, estimated fair value	6,454	6,410
ABS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	6,547	6,514
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	27	23
Fixed maturity securities, gross unrealized losses	109	131
Fixed maturity securities, estimated fair value	6,465	6,406
State and political subdivision
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	3,957	4,019
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	129	159
Fixed maturity securities, gross unrealized losses	325	304
Fixed maturity securities, estimated fair value	3,761	3,874
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, amortized cost	1,069	1,077
Fixed maturity securities, allowance for credit losses	0	0
Fixed maturity securities, gross unrealized gains	32	42
Fixed maturity securities, gross unrealized losses	98	87
Fixed maturity securities, estimated fair value	$ 1,003	$ 1,032

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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