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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 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 | $ 41,073 |  | $ 40,078
Allowance for credit losses, fixed maturity, AFS | 32 | $ 32 | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 3,145 |  | 2,125
Gross Unrealized Losses, fixed maturities, available-for-sale | (142) |  | (55)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 44,044 |  | 42,148
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities |  |  | 4
ABS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturities, available-for-sale, at fair value, amortized cost | 1,449 |  | 1,461
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 41 |  | 18
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 |  | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,490 |  | 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 | 2,465 |  | 2,186
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 4 |  | 5
Gross Unrealized Losses, fixed maturities, available-for-sale | (20) |  | (8)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2,449 |  | 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 | 4,200 |  | 4,210
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 275 |  | 141
Gross Unrealized Losses, fixed maturities, available-for-sale | (31) |  | (13)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,444 |  | 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 | 17,930 |  | 16,435
Allowance for credit losses, fixed maturity, AFS | 29 | 32 | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,597 |  | 986
Gross Unrealized Losses, fixed maturities, available-for-sale | (82) |  | (25)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 19,416 |  | 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 | 901 |  | 1,057
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 83 |  | 66
Gross Unrealized Losses, fixed maturities, available-for-sale | 0 |  | 0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 984 |  | 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 | 8,491 |  | 8,763
Allowance for credit losses, fixed maturity, AFS | 3 | $ 0 | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 829 |  | 737
Gross Unrealized Losses, fixed maturities, available-for-sale | (7) |  | (2)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 9,310 |  | 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 | 4,394 |  | 4,775
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 156 |  | 97
Gross Unrealized Losses, fixed maturities, available-for-sale | (2) |  | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,548 |  | 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 | 1,243 |  | 1,191
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 160 |  | 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) | $ 1,403 |  | 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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