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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | $ 39,473 | $ 40,078
Allowance for credit losses, fixed maturity, AFS | (12) | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,699 | 2,125
Gross Unrealized Losses, fixed maturities, available-for-sale | (955) | (55)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 40,205 | 42,148
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 4
Amortized Cost |  |
One year or less | 1,197 | 1,082
Over one year through five years | 7,477 | 7,200
Over five years through ten years | 7,032 | 7,395
Over ten years | 11,863 | 11,769
Subtotal | 27,569 | 27,446
Mortgage-backed and asset-backed securities | 11,904 | 12,632
Fair Value |  |
One year or less | 1,196 | 1,090
Over one year through five years | 7,447 | 7,401
Over five years through ten years | 7,053 | 7,803
Over ten years | 12,784 | 12,988
Subtotal | 28,480 | 29,282
Mortgage-backed and asset-backed securities | 11,725 | 12,866
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,368 | 1,461
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 6 | 18
Gross Unrealized Losses, fixed maturities, available-for-sale | (26) | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,348 | 1,476
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 2,168 | 2,186
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 0 | 5
Gross Unrealized Losses, fixed maturities, available-for-sale | (179) | (8)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,989 | 2,183
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,316 | 4,210
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 102 | 141
Gross Unrealized Losses, fixed maturities, available-for-sale | (116) | (13)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,302 | 4,338
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 4
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 16,744 | 16,435
Allowance for credit losses, fixed maturity, AFS | 12 | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 585 | 986
Gross Unrealized Losses, fixed maturities, available-for-sale | (519) | (25)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 16,798 | 17,396
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,058 | 1,057
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 28 | 66
Gross Unrealized Losses, fixed maturities, available-for-sale | (23) | 0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,063 | 1,123
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 8,843 | 8,763
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 684 | 737
Gross Unrealized Losses, fixed maturities, available-for-sale | (30) | (2)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 9,497 | 9,498
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 4,052 | 4,775
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 96 | 97
Gross Unrealized Losses, fixed maturities, available-for-sale | (62) | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,086 | 4,869
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | 0
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 924 | 1,191
Allowance for credit losses, fixed maturity, AFS | 0 |
Gross Unrealized Gains, fixed maturities, available-for-sale | 198 | 75
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) | $ 1,122 | 1,265
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  | $ 0

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