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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 39,429 | $ 35,603
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,805 | 703
Gross Unrealized Losses, fixed maturities, available-for-sale | (68) | (654)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 41,166 | 35,652
Non-Credit OTTI | (4) | (5)
Amortized Cost |  |
One year or less | 1,094 | 999
Over one year through five years | 7,164 | 5,786
Over five years through ten years | 7,580 | 6,611
Over ten years | 12,400 | 12,629
Subtotal | 28,238 | 26,025
Mortgage-backed and asset-backed securities | 11,191 | 9,578
Fair Value |  |
One year or less | 1,100 | 1,002
Over one year through five years | 7,332 | 5,791
Over five years through ten years | 7,910 | 6,495
Over ten years | 13,399 | 12,820
Subtotal | 29,741 | 26,108
Mortgage-backed and asset-backed securities | 11,425 | 9,544
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,010 | 1,272
Gross Unrealized Gains, fixed maturities, available-for-sale | 19 | 5
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (1)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,029 | 1,276
Non-Credit OTTI | 0 | 0
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,929 | 1,455
Gross Unrealized Gains, fixed maturities, available-for-sale | 4 | 2
Gross Unrealized Losses, fixed maturities, available-for-sale | (8) | (20)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,925 | 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 | 3,774 | 3,581
Gross Unrealized Gains, fixed maturities, available-for-sale | 139 | 35
Gross Unrealized Losses, fixed maturities, available-for-sale | (8) | (64)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,905 | 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 | 16,078 | 13,696
Gross Unrealized Gains, fixed maturities, available-for-sale | 718 | 148
Gross Unrealized Losses, fixed maturities, available-for-sale | (48) | (446)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 16,748 | 13,398
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 | 1,025 | 866
Gross Unrealized Gains, fixed maturities, available-for-sale | 48 | 7
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) | (26)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,072 | 847
Non-Credit OTTI | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 9,568 | 9,972
Gross Unrealized Gains, fixed maturities, available-for-sale | 710 | 421
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 | (47)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 10,278 | 10,346
Non-Credit OTTI | 0 | 0
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,478 | 3,270
Gross Unrealized Gains, fixed maturities, available-for-sale | 90 | 44
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) | (35)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,566 | 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 | 1,567 | 1,491
Gross Unrealized Gains, fixed maturities, available-for-sale | 77 | 41
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) | (15)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,643 | 1,517
Non-Credit OTTI | $ 0 | $ 0

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