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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 41,561 | $ 40,078
Debt Securities, Available-for-sale, Allowance for Credit Loss | (23) | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 3,560 | 2,125
Gross Unrealized Losses, fixed maturities, available-for-sale | (63) | (55)
Total fixed maturities | 45,035 | 42,148
Non-Credit OTTI |  | (4)
Amortized Cost |  |
One year or less | 1,411 | 1,082
Over one year through five years | 7,832 | 7,200
Over five years through ten years | 7,622 | 7,395
Over ten years | 12,206 | 11,769
Subtotal | 29,071 | 27,446
Mortgage-backed and asset-backed securities | 12,490 | 12,632
Fair Value |  |
One year or less | 1,432 | 1,090
Over one year through five years | 8,286 | 7,401
Over five years through ten years | 8,354 | 7,803
Over ten years | 14,028 | 12,988
Subtotal | 32,100 | 29,282
Mortgage-backed and asset-backed securities | 12,935 | 12,866
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,525 | 1,461
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 39 | 18
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (3)
Total fixed maturities | 1,564 | 1,476
Non-Credit OTTI |  | 0
Collateralized loan obligations ("CLOs") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,780 | 2,186
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 7 | 5
Gross Unrealized Losses, fixed maturities, available-for-sale | (7) | (8)
Total fixed maturities | 2,780 | 2,183
Non-Credit OTTI |  | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,219 | 4,210
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 286 | 141
Gross Unrealized Losses, fixed maturities, available-for-sale | (21) | (13)
Total fixed maturities | 4,484 | 4,338
Non-Credit OTTI |  | (4)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 18,401 | 16,435
Debt Securities, Available-for-sale, Allowance for Credit Loss | (23) | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,926 | 986
Gross Unrealized Losses, fixed maturities, available-for-sale | (31) | (25)
Total fixed maturities | 20,273 | 17,396
Non-Credit OTTI |  | 0
Foreign government/government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 842 | 1,057
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 77 | 66
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | 0
Total fixed maturities | 919 | 1,123
Non-Credit OTTI |  | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 8,564 | 8,763
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 940 | 737
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) | (2)
Total fixed maturities | 9,503 | 9,498
Non-Credit OTTI |  | 0
Residential mortgage-backed securities ("RMBS") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,966 | 4,775
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 144 | 97
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | (3)
Total fixed maturities | 4,107 | 4,869
Non-Credit OTTI |  | 0
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,264 | 1,191
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 141 | 75
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (1)
Total fixed maturities | $ 1,405 | 1,265
Non-Credit OTTI |  | $ 0

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