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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,057 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 98.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 204 | 44
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 204 | 44
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 0 | 0
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 842 | 758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 159 | 715
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,001 | 1,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1 | 7
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 17
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 298 | 410
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 87 | 19
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 385 | 429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 9 | 21
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,229 | 466
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8 | 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 208 | 212
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,437 | 678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 42 | 31
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 265 | 24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 265 | 24
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 3 | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 695 | 34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 707 | 34
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 11 | 1
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 880 | 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 100 | 21
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 980 | 482
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 11 | 3
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 17 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,707 | 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,710 | 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 17 | 0
Available-for-sale Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 77 | 36
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,120 | 2,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 17 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 569 | 967
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 8,689 | 3,203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 94 | $ 63

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