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Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | $ 300,623 | $ 300,555 |  |
Allowance for Credit Loss for Debt Securities | (113) | (184) | $ (193) | $ (183)
Gross Unrealized Gains | 6,021 | 6,876 |  |
Gross Unrealized Losses | 28,122 | 25,835 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 278,409 | 281,412 |  |
U.S. corporate |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 86,317 | 85,563 |  |
Allowance for Credit Loss for Debt Securities | (15) | (68) | (63) | (29)
Gross Unrealized Gains | 1,706 | 1,894 |  |
Gross Unrealized Losses | 7,455 | 6,672 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 80,553 | 80,717 |  |
Foreign corporate |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 58,146 | 59,123 |  |
Allowance for Credit Loss for Debt Securities | (2) | (2) | (2) | (5)
Gross Unrealized Gains | 1,704 | 1,750 |  |
Gross Unrealized Losses | 5,819 | 5,427 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 54,029 | 55,444 |  |
Foreign government |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 46,155 | 48,260 |  |
Allowance for Credit Loss for Debt Securities | (66) | (88) | (117) | (130)
Gross Unrealized Gains | 1,478 | 1,754 |  |
Gross Unrealized Losses | 4,774 | 4,437 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 42,793 | 45,489 |  |
U.S. government and agency |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 36,021 | 35,374 |  |
Allowance for Credit Loss for Debt Securities | 0 | 0 |  |
Gross Unrealized Gains | 317 | 590 |  |
Gross Unrealized Losses | 4,490 | 3,712 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 31,848 | 32,252 |  |
RMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 33,798 | 31,479 |  |
Allowance for Credit Loss for Debt Securities | (1) | (1) | 0 | 0
Gross Unrealized Gains | 317 | 353 |  |
Gross Unrealized Losses | 2,972 | 2,735 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 31,142 | 29,096 |  |
ABS & CLO |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 17,973 | 17,910 |  |
Allowance for Credit Loss for Debt Securities | (9) | (7) | 0 | 0
Gross Unrealized Gains | 73 | 54 |  |
Gross Unrealized Losses | 569 | 663 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 17,468 | 17,294 |  |
Municipals |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 11,898 | 11,991 |  |
Allowance for Credit Loss for Debt Securities | 0 | 0 |  |
Gross Unrealized Gains | 324 | 408 |  |
Gross Unrealized Losses | 1,284 | 1,228 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | 10,938 | 11,171 |  |
CMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost | 10,315 | 10,855 |  |
Allowance for Credit Loss for Debt Securities | (20) | (18) | $ (11) | $ (19)
Gross Unrealized Gains | 102 | 73 |  |
Gross Unrealized Losses | 759 | 961 |  |
Estimated Fair Value of Fixed Maturity Securities AFS | $ 9,638 | $ 9,949 |  |

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