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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 39,587 |  | $ 40,788 |  |  |
Allowance for credit losses, fixed maturity, AFS | (15) | $ (13) | (1) | $ (4) | $ (4) | $ (23)
Gross Unrealized Gains, fixed maturities, available-for-sale | 91 |  | 2,204 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (3,946) |  | (144) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 35,717 |  | 42,847 |  |  |
ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,969 |  | 1,125 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 0 |  | 13 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (77) |  | (3) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,892 |  | 1,135 |  |  |
Collateralized Loan Obligations [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,027 |  | 3,019 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 2 |  | 8 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (110) |  | (2) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2,919 |  | 3,025 |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,601 |  | 3,955 |  |  |
Allowance for credit losses, fixed maturity, AFS | (7) | (1) | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 22 |  | 179 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (338) |  | (15) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,278 |  | 4,119 |  |  |
Corporate |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 16,799 |  | 17,744 |  |  |
Allowance for credit losses, fixed maturity, AFS | (8) | (8) | (1) | $ (4) | $ (4) | $ (23)
Gross Unrealized Gains, fixed maturities, available-for-sale | 9 |  | 1,038 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (1,912) |  | (74) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 14,888 |  | 18,707 |  |  |
Foreign Govt./Govt. Agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 655 |  | 883 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 | $ (4) | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 0 |  | 33 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (71) |  | (6) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 584 |  | 910 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 6,839 |  | 7,473 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 55 |  | 787 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (697) |  | (3) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 6,197 |  | 8,257 |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,218 |  | 3,610 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 2 |  | 60 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (496) |  | (27) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,724 |  | 3,643 |  |  |
U.S. Treasuries |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,479 |  | 2,979 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 1 |  | 86 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (245) |  | (14) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 2,235 |  | $ 3,051 |  |  |

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