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Investments - Unrealized Losses on AFS Securities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | $ 44 | $ 398
Less Than 12 Months UL | 0 | (3)
12 Months or More FV | 0 | 9
12 Months or More UL | 0 | 0
Total FV | 44 | 407
Total UL | 0 | (3)
Collateralized loan obligations ("CLOs") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 758 | 679
Less Than 12 Months UL | (2) | (2)
12 Months or More FV | 715 | 923
12 Months or More UL | (5) | (6)
Total FV | 1,473 | 1,602
Total UL | (7) | (8)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 410 | 538
Less Than 12 Months UL | (17) | (7)
12 Months or More FV | 19 | 20
12 Months or More UL | (4) | (6)
Total FV | 429 | 558
Total UL | (21) | (13)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 466 | 789
Less Than 12 Months UL | (13) | (9)
12 Months or More FV | 212 | 328
12 Months or More UL | (18) | (16)
Total FV | 678 | 1,117
Total UL | (31) | (25)
Foreign government/government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 24 | 101
Less Than 12 Months UL | 0 | 0
12 Months or More FV | 0 | 29
12 Months or More UL | 0 | 0
Total FV | 24 | 130
Total UL | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 34 | 222
Less Than 12 Months UL | (1) | (2)
12 Months or More FV | 0 | 0
12 Months or More UL | 0 | 0
Total FV | 34 | 222
Total UL | (1) | (2)
Residential mortgage-backed securities ("RMBS") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 461 | 614
Less Than 12 Months UL | (3) | (3)
12 Months or More FV | 21 | 68
12 Months or More UL | 0 | 0
Total FV | 482 | 682
Total UL | (3) | (3)
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 39 | 88
Less Than 12 Months UL | 0 | 0
12 Months or More FV | 0 | 34
12 Months or More UL | 0 | (1)
Total FV | 39 | 122
Total UL | 0 | (1)
Securities available-for-sale and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 2,236 | 3,429
Less Than 12 Months UL | (36) | (26)
12 Months or More FV | 967 | 1,411
12 Months or More UL | (27) | (29)
Total FV | 3,203 | 4,840
Total UL | $ (63) | $ (55)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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