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Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 35,603 | $ 35,612
Gross Unrealized Gains, fixed maturities, available-for-sale | 703 | 1,466
Gross Unrealized Losses, fixed maturities, available-for-sale | (654) | (114)
Total fixed maturities | 35,652 | 36,964
Non-Credit OTTI | (5) | (5)
Equity securities, available-for-sale, Cost or Amortized Cost | 0 | 907
Equity securities, at fair value | 0 | 1,012
Available-for-sale, Cost or Amortized Cost | 35,603 | 36,519
Available-for-sale, Gross Unrealized Gains | 703 | 1,587
Available-for-sale, Gross Unrealized Losses | (654) | (130)
Available-for-sale, Fair Value | 35,652 | 37,976
Amortized Cost |  |
One year or less | 999 | 1,507
Over one year through five years | 5,786 | 5,007
Over five years through ten years | 6,611 | 6,505
Over ten years | 12,629 | 13,928
Subtotal | 26,025 | 26,947
Mortgage-backed and asset-backed securities | 9,578 | 8,665
Fair Value |  |
One year or less | 1,002 | 1,513
Over one year through five years | 5,791 | 5,119
Over five years through ten years | 6,495 | 6,700
Over ten years | 12,820 | 14,866
Subtotal | 26,108 | 28,198
Mortgage-backed and asset-backed securities | 9,544 | 8,766
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,272 | 1,119
Gross Unrealized Gains, fixed maturities, available-for-sale | 5 | 9
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) | (2)
Total fixed maturities | 1,276 | 1,126
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 | 1,455 | 1,257
Gross Unrealized Gains, fixed maturities, available-for-sale | 2 | 3
Gross Unrealized Losses, fixed maturities, available-for-sale | (20) | 0
Total fixed maturities | 1,437 | 1,260
Non-Credit OTTI | 0 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,581 | 3,304
Gross Unrealized Gains, fixed maturities, available-for-sale | 35 | 58
Gross Unrealized Losses, fixed maturities, available-for-sale | (64) | (26)
Total fixed maturities | 3,552 | 3,336
Non-Credit OTTI | (5) | (5)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 13,696 | 12,370
Gross Unrealized Gains, fixed maturities, available-for-sale | 148 | 490
Gross Unrealized Losses, fixed maturities, available-for-sale | (446) | (56)
Total fixed maturities | 13,398 | 12,804
Non-Credit OTTI | 0 | 0
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 866 | 1,071
Gross Unrealized Gains, fixed maturities, available-for-sale | 7 | 43
Gross Unrealized Losses, fixed maturities, available-for-sale | (26) | (4)
Total fixed maturities | 847 | 1,110
Non-Credit OTTI | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 9,972 | 11,743
Gross Unrealized Gains, fixed maturities, available-for-sale | 421 | 754
Gross Unrealized Losses, fixed maturities, available-for-sale | (47) | (12)
Total fixed maturities | 10,346 | 12,485
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 | 3,270 | 2,985
Gross Unrealized Gains, fixed maturities, available-for-sale | 44 | 63
Gross Unrealized Losses, fixed maturities, available-for-sale | (35) | (4)
Total fixed maturities | 3,279 | 3,044
Non-Credit OTTI | 0 | 0
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,491 | 1,763
Gross Unrealized Gains, fixed maturities, available-for-sale | 41 | 46
Gross Unrealized Losses, fixed maturities, available-for-sale | (15) | (10)
Total fixed maturities | 1,517 | 1,799
Non-Credit OTTI | 0 | 0
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Non-Credit OTTI |  | 0
Equity securities, available-for-sale, Cost or Amortized Cost |  | 907
Gross Unrealized Gains, fixed maturities, available-for-sale |  | 121
Gross Unrealized Losses Gains, fixed maturities, available-for-sale |  | (16)
Equity securities, at fair value |  | $ 1,012

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