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Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 300,555 | $ 306,025 |
Allowance for Credit Loss for Debt Securities | (184) | (183) | $ (91)
Gross Unrealized Gains | 6,876 | 5,239 |
Gross Unrealized Losses | 25,835 | 34,301 |
Estimated Fair Value of Fixed Maturity Securities AFS | 281,412 | 276,780 |
U.S. corporate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 85,563 | 88,466 |
Allowance for Credit Loss for Debt Securities | (68) | (29) | (30)
Gross Unrealized Gains | 1,894 | 1,133 |
Gross Unrealized Losses | 6,672 | 9,540 |
Estimated Fair Value of Fixed Maturity Securities AFS | 80,717 | 80,030 |
Foreign corporate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 59,123 | 59,696 |
Allowance for Credit Loss for Debt Securities | (2) | (5) | (28)
Gross Unrealized Gains | 1,750 | 1,213 |
Gross Unrealized Losses | 5,427 | 8,332 |
Estimated Fair Value of Fixed Maturity Securities AFS | 55,444 | 52,572 |
Foreign government |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 48,260 | 50,047 |
Allowance for Credit Loss for Debt Securities | (88) | (130) | (19)
Gross Unrealized Gains | 1,754 | 1,876 |
Gross Unrealized Losses | 4,437 | 5,046 |
Estimated Fair Value of Fixed Maturity Securities AFS | 45,489 | 46,747 |
U.S. government and agency |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 35,374 | 35,658 |
Allowance for Credit Loss for Debt Securities | 0 | 0 |
Gross Unrealized Gains | 590 | 431 |
Gross Unrealized Losses | 3,712 | 3,860 |
Estimated Fair Value of Fixed Maturity Securities AFS | 32,252 | 32,229 |
RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 31,479 | 29,496 |
Allowance for Credit Loss for Debt Securities | (1) | 0 | 0
Gross Unrealized Gains | 353 | 187 |
Gross Unrealized Losses | 2,735 | 3,518 |
Estimated Fair Value of Fixed Maturity Securities AFS | 29,096 | 26,165 |
ABS & CLO |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 17,910 | 17,991 |
Allowance for Credit Loss for Debt Securities | (7) | 0 | 0
Gross Unrealized Gains | 54 | 23 |
Gross Unrealized Losses | 663 | 1,192 |
Estimated Fair Value of Fixed Maturity Securities AFS | 17,294 | 16,822 |
Municipals |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 11,991 | 13,548 |
Allowance for Credit Loss for Debt Securities | 0 | 0 |
Gross Unrealized Gains | 408 | 317 |
Gross Unrealized Losses | 1,228 | 1,713 |
Estimated Fair Value of Fixed Maturity Securities AFS | 11,171 | 12,152 |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 10,855 | 11,123 |
Allowance for Credit Loss for Debt Securities | (18) | (19) | $ (14)
Gross Unrealized Gains | 73 | 59 |
Gross Unrealized Losses | 961 | 1,100 |
Estimated Fair Value of Fixed Maturity Securities AFS | $ 9,949 | $ 10,063 |

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