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Investments (Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | $ 84,693 | $ 84,344
Fixed maturity securities, allowance for credit losses | 5 | 7
Fixed maturity securities, gross unrealized gains | 1,130 | 752
Fixed maturity securities, gross unrealized losses | 8,133 | 9,512
Fixed maturity securities, estimated fair value | 77,685 | 75,577
U.S. corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 37,171 | 36,926
Fixed maturity securities, allowance for credit losses | 0 | 1
Fixed maturity securities, gross unrealized gains | 320 | 203
Fixed maturity securities, gross unrealized losses | 3,879 | 4,521
Fixed maturity securities, estimated fair value | 33,612 | 32,607
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 12,465 | 12,471
Fixed maturity securities, allowance for credit losses | 0 | 1
Fixed maturity securities, gross unrealized gains | 56 | 38
Fixed maturity securities, gross unrealized losses | 1,638 | 1,932
Fixed maturity securities, estimated fair value | 10,883 | 10,576
U.S. government and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 8,310 | 8,318
Fixed maturity securities, allowance for credit losses | 0 | 0
Fixed maturity securities, gross unrealized gains | 472 | 300
Fixed maturity securities, gross unrealized losses | 495 | 602
Fixed maturity securities, estimated fair value | 8,287 | 8,016
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 8,357 | 8,431
Fixed maturity securities, allowance for credit losses | 2 | 2
Fixed maturity securities, gross unrealized gains | 46 | 44
Fixed maturity securities, gross unrealized losses | 811 | 945
Fixed maturity securities, estimated fair value | 7,590 | 7,528
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 7,343 | 7,324
Fixed maturity securities, allowance for credit losses | 3 | 3
Fixed maturity securities, gross unrealized gains | 0 | 0
Fixed maturity securities, gross unrealized losses | 666 | 710
Fixed maturity securities, estimated fair value | 6,674 | 6,611
State and political subdivision |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 4,072 | 4,074
Fixed maturity securities, allowance for credit losses | 0 | 0
Fixed maturity securities, gross unrealized gains | 178 | 125
Fixed maturity securities, gross unrealized losses | 301 | 400
Fixed maturity securities, estimated fair value | 3,949 | 3,799
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 5,835 | 5,652
Fixed maturity securities, allowance for credit losses | 0 | 0
Fixed maturity securities, gross unrealized gains | 9 | 3
Fixed maturity securities, gross unrealized losses | 248 | 296
Fixed maturity securities, estimated fair value | 5,596 | 5,359
Foreign Government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities, amortized cost | 1,140 | 1,148
Fixed maturity securities, allowance for credit losses | 0 | 0
Fixed maturity securities, gross unrealized gains | 49 | 39
Fixed maturity securities, gross unrealized losses | 95 | 106
Fixed maturity securities, estimated fair value | $ 1,094 | $ 1,081

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