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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1,149 |
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 | $ 127 | $ 398
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 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 | 127 | 407
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 3
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 1,435 | 679
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34 | 2
12 Months or More FV | 723 | 923
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 6
Total FV | 2,158 | 1,602
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 59 | 8
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 734 | 538
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 59 | 7
12 Months or More FV | 17 | 20
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 6
Total FV | 751 | 558
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 64 | 13
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 1,646 | 789
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 99 | 9
12 Months or More FV | 179 | 328
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 30 | 16
Total FV | 1,825 | 1,117
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 129 | 25
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 136 | 101
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 0
12 Months or More FV | 1 | 29
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 137 | 130
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 319 | 222
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 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 | 319 | 222
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 14 | 2
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 195 | 614
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 3
12 Months or More FV | 35 | 68
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Total FV | 230 | 682
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4 | 3
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 236 | 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 | 236 | 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 | 4,828 | 3,429
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 214 | 26
12 Months or More FV | 955 | 1,411
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 61 | 29
Total FV | 5,783 | 4,840
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 275 | $ 55

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