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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 35,894,000,000 | $ 35,603,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,134,000,000 | 703,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (209,000,000) | (654,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 36,819,000,000 | 35,652,000,000
Non-Credit OTTI | (4,000,000) | (5,000,000)
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | 0 | 0
Amortized Cost |  |
One year or less | 964,000,000 | 999,000,000
Over one year through five years | 5,785,000,000 | 5,786,000,000
Over five years through ten years | 7,259,000,000 | 6,611,000,000
Over ten years | 12,444,000,000 | 12,629,000,000
Subtotal | 26,452,000,000 | 26,025,000,000
Mortgage-backed and asset-backed securities | 9,442,000,000 | 9,578,000,000
Fair Value |  |
One year or less | 969,000,000 | 1,002,000,000
Over one year through five years | 5,871,000,000 | 5,791,000,000
Over five years through ten years | 7,391,000,000 | 6,495,000,000
Over ten years | 13,066,000,000 | 12,820,000,000
Subtotal | 27,297,000,000 | 26,108,000,000
Mortgage-backed and asset-backed securities | 9,522,000,000 | 9,544,000,000
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 959,000,000 | 1,272,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 10,000,000 | 5,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (1,000,000) | (1,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 968,000,000 | 1,276,000,000
Non-Credit OTTI | 0 | 0
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,442,000,000 | 1,455,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 7,000,000 | 2,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (11,000,000) | (20,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,438,000,000 | 1,437,000,000
Non-Credit OTTI | 0 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,534,000,000 | 3,581,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 67,000,000 | 35,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (33,000,000) | (64,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,568,000,000 | 3,552,000,000
Non-Credit OTTI | (4,000,000) | (5,000,000)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 14,187,000,000 | 13,696,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 349,000,000 | 148,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (133,000,000) | (446,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 14,403,000,000 | 13,398,000,000
Non-Credit OTTI | 0 | 0
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 866,000,000 | 866,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 23,000,000 | 7,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (7,000,000) | (26,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 882,000,000 | 847,000,000
Non-Credit OTTI | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 9,780,000,000 | 9,972,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 573,000,000 | 421,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (7,000,000) | (47,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 10,346,000,000 | 10,346,000,000
Non-Credit OTTI | 0 | 0
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 3,507,000,000 | 3,270,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 54,000,000 | 44,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (13,000,000) | (35,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,548,000,000 | 3,279,000,000
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 | 1,619,000,000 | 1,491,000,000
Gross Unrealized Gains, fixed maturities, available-for-sale | 51,000,000 | 41,000,000
Gross Unrealized Losses, fixed maturities, available-for-sale | (4,000,000) | (15,000,000)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,666,000,000 | 1,517,000,000
Non-Credit OTTI | $ 0 | $ 0

X
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