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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 40,078 | $ 35,603
Gross Unrealized Gains, fixed maturities, available-for-sale | 2,125 | 703
Gross Unrealized Losses, fixed maturities, available-for-sale | (55) | (654)
Total fixed maturities | 42,148 | 35,652
Non-Credit OTTI | (4) | (5)
Amortized Cost |  |
One year or less | 1,082 | 999
Over one year through five years | 7,200 | 5,786
Over five years through ten years | 7,395 | 6,611
Over ten years | 11,769 | 12,629
Subtotal | 27,446 | 26,025
Mortgage-backed and asset-backed securities | 12,632 | 9,578
Fair Value |  |
One year or less | 1,090 | 1,002
Over one year through five years | 7,401 | 5,791
Over five years through ten years | 7,803 | 6,495
Over ten years | 12,988 | 12,820
Subtotal | 29,282 | 26,108
Mortgage-backed and asset-backed securities | 12,866 | 9,544
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,461 | 1,272
Gross Unrealized Gains, fixed maturities, available-for-sale | 18 | 5
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | (1)
Total fixed maturities | 1,476 | 1,276
Non-Credit OTTI | 0 | 0
Collateralized loan obligations (CLOs) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,186 | 1,455
Gross Unrealized Gains, fixed maturities, available-for-sale | 5 | 2
Gross Unrealized Losses, fixed maturities, available-for-sale | (8) | (20)
Total fixed maturities | 2,183 | 1,437
Non-Credit OTTI | 0 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,210 | 3,581
Gross Unrealized Gains, fixed maturities, available-for-sale | 141 | 35
Gross Unrealized Losses, fixed maturities, available-for-sale | (13) | (64)
Total fixed maturities | 4,338 | 3,552
Non-Credit OTTI | (4) | (5)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 16,435 | 13,696
Gross Unrealized Gains, fixed maturities, available-for-sale | 986 | 148
Gross Unrealized Losses, fixed maturities, available-for-sale | (25) | (446)
Total fixed maturities | 17,396 | 13,398
Non-Credit OTTI | 0 | 0
Foreign government/government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,057 | 866
Gross Unrealized Gains, fixed maturities, available-for-sale | 66 | 7
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (26)
Total fixed maturities | 1,123 | 847
Non-Credit OTTI | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 8,763 | 9,972
Gross Unrealized Gains, fixed maturities, available-for-sale | 737 | 421
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) | (47)
Total fixed maturities | 9,498 | 10,346
Non-Credit OTTI | 0 | 0
Residential mortgage-backed securities (RMBS) |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,775 | 3,270
Gross Unrealized Gains, fixed maturities, available-for-sale | 97 | 44
Gross Unrealized Losses, fixed maturities, available-for-sale | (3) | (35)
Total fixed maturities | 4,869 | 3,279
Non-Credit OTTI | 0 | 0
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,191 | 1,491
Gross Unrealized Gains, fixed maturities, available-for-sale | 75 | 41
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) | (15)
Total fixed maturities | 1,265 | 1,517
Non-Credit OTTI | $ 0 | $ 0

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