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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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