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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 41,220 |  | $ 41,561 |  |  |
Allowance for credit losses, fixed maturity, AFS | (4) | $ (19) | (23) | $ (32) | $ (12) | $ 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 2,864 |  | 3,560 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (57) |  | (63) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 44,023 |  | 45,035 |  |  |
ABS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,295 |  | 1,525 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 26 |  | 39 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 |  | 0 |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,321 |  | 1,564 |  |  |
Collateralized Loan Obligations [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,092 |  | 2,780 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 9 |  | 7 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) |  | (7) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,100 |  | 2,780 |  |  |
CMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,853 |  | 4,219 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 250 |  | 286 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (8) |  | (21) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,095 |  | 4,484 |  |  |
Corporate |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 17,740 |  | 18,401 |  |  |
Allowance for credit losses, fixed maturity, AFS | (4) | $ (19) | (23) | $ (32) | $ (12) | $ 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,457 |  | 1,926 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (32) |  | (31) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 19,161 |  | 20,273 |  |  |
Foreign Govt./Govt. Agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 824 |  | 842 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 52 |  | 77 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) |  | 0 |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 873 |  | 919 |  |  |
Municipal |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 8,281 |  | 8,564 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 882 |  | 940 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) |  | (1) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 9,161 |  | 9,503 |  |  |
RMBS |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,436 |  | 3,966 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 92 |  | 144 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (8) |  | (3) |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,520 |  | 4,107 |  |  |
U.S. Treasuries |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,699 |  | 1,264 |  |  |
Allowance for credit losses, fixed maturity, AFS | 0 |  | 0 |  |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 96 |  | 141 |  |  |
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) |  | 0 |  |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 2,792 |  | $ 1,405 |  |  |

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