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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 40,788 | $ 41,561 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (1) | (23) | $ 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 2,204 | 3,560 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (144) | (63) |
Total fixed maturities | 42,847 | 45,035 |
Amortized Cost |  |  |
One year or less | 1,400 | 1,411 |
Over one year through five years | 8,615 | 7,832 |
Over five years through ten years | 8,303 | 7,622 |
Over ten years | 10,761 | 12,206 |
Subtotal | 29,079 | 29,071 |
Mortgage-backed and asset-backed securities | 11,709 | 12,490 |
Fair Value |  |  |
One year or less | 1,419 | 1,432 |
Over one year through five years | 8,894 | 8,286 |
Over five years through ten years | 8,633 | 8,354 |
Over ten years | 11,979 | 14,028 |
Subtotal | 30,925 | 32,100 |
Mortgage-backed and asset-backed securities | 11,922 | 12,935 |
ABS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,125 | 1,525 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 13 | 39 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | 0 |
Total fixed maturities | 1,135 | 1,564 |
CLOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,019 | 2,780 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 8 | 7 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) | (7) |
Total fixed maturities | 3,025 | 2,780 |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,955 | 4,219 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 179 | 286 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (15) | (21) |
Total fixed maturities | 4,119 | 4,484 |
Corporate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 17,744 | 18,401 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | (1) | (23) | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,038 | 1,926 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (74) | (31) |
Total fixed maturities | 18,707 | 20,273 |
Foreign government/government agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 883 | 842 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 33 | 77 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (6) | 0 |
Total fixed maturities | 910 | 919 |
Municipal |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 7,473 | 8,564 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 | $ 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 787 | 940 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | (1) |
Total fixed maturities | 8,257 | 9,503 |
Residential mortgage-backed securities ("RMBS") |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,610 | 3,966 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 60 | 144 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (27) | (3) |
Total fixed maturities | 3,643 | 4,107 |
U.S. Treasuries |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,979 | 1,264 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 86 | 141 |
Gross Unrealized Losses, fixed maturities, available-for-sale | (14) | 0 |
Total fixed maturities | $ 3,051 | $ 1,405 |

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