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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 898 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 96.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | $ 44 | $ 398
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 3
12 Months or More FV | 0 | 9
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 44 | 407
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 3
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 1,193 | 679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 2
12 Months or More FV | 741 | 923
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10 | 6
Total FV | 1,934 | 1,602
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 20 | 8
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 533 | 538
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 27 | 7
12 Months or More FV | 16 | 20
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 6
Total FV | 549 | 558
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 31 | 13
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 1,609 | 789
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 56 | 9
12 Months or More FV | 202 | 328
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 26 | 16
Total FV | 1,811 | 1,117
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 82 | 25
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 79 | 101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
12 Months or More FV | 0 | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 79 | 130
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 478 | 222
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 2
12 Months or More FV | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 478 | 222
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7 | 2
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 514 | 614
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 3
12 Months or More FV | 29 | 68
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 543 | 682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2 | 3
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 28 | 88
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
12 Months or More FV | 0 | 34
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 1
Total FV | 28 | 122
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 1
Available-for-sale Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 4,478 | 3,429
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 102 | 26
12 Months or More FV | 988 | 1,411
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 40 | 29
Total FV | 5,466 | 4,840
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 142 | $ 55

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