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Investments - Investments - Available-for-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | 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 | $ 39,640 |  | $ 40,078
Allowance for credit losses, fixed maturity, AFS | (32) |  | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 2,867 |  | 2,125
Gross Unrealized Losses, fixed maturities, available-for-sale | (275) |  | (55)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 42,200 |  | 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 | 1,387 |  | 1,461
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 30 |  | 18
Gross Unrealized Losses, fixed maturities, available-for-sale | (1) |  | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,416 |  | 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 | 2,246 |  | 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 | (59) |  | (8)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2,187 |  | 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 | 4,067 |  | 4,210
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 208 |  | 141
Gross Unrealized Losses, fixed maturities, available-for-sale | (64) |  | (13)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 4,211 |  | 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 | 17,283 |  | 16,435
Allowance for credit losses, fixed maturity, AFS | (32) | $ (12) | 0
Gross Unrealized Gains, fixed maturities, available-for-sale | 1,441 |  | 986
Gross Unrealized Losses, fixed maturities, available-for-sale | (129) |  | (25)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 18,563 |  | 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 | 906 |  | 1,057
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 70 |  | 66
Gross Unrealized Losses, fixed maturities, available-for-sale | (4) |  | 0
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 972 |  | 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 | 8,604 |  | 8,763
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 804 |  | 737
Gross Unrealized Losses, fixed maturities, available-for-sale | (14) |  | (2)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 9,394 |  | 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 | 3,750 |  | 4,775
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 149 |  | 97
Gross Unrealized Losses, fixed maturities, available-for-sale | (4) |  | (3)
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,895 |  | 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 | 1,397 |  | 1,191
Allowance for credit losses, fixed maturity, AFS | 0 |  |
Gross Unrealized Gains, fixed maturities, available-for-sale | 165 |  | 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) | $ 1,562 |  | 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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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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