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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 787 |
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 | $ 137 | $ 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
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 | 137 | 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 703 | 758
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 2
12 Months or More FV | 251 | 715
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 5
Total FV | 954 | 1,473
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 7
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 130 | 410
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 17
12 Months or More FV | 91 | 19
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 4
Total FV | 221 | 429
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8 | 21
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 1,436 | 466
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23 | 13
12 Months or More FV | 207 | 212
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9 | 18
Total FV | 1,643 | 678
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 32 | 31
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 153 | 24
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 0
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 | 153 | 24
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 3 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 263 | 34
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 1
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 | 263 | 34
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 2 | 1
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 725 | 461
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 3
12 Months or More FV | 6 | 21
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Total FV | 731 | 482
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8 | 3
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 377 | 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 0
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 | 377 | 39
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 3 | 0
Available-for-sale Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months FV | 3,924 | 2,236
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 41 | 36
12 Months or More FV | 555 | 967
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 16 | 27
Total FV | 4,479 | 3,203
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 57 | $ 63

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