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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 3,433 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 99.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 22 | $ 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 795 | 396
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 | 4 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 799 | 396
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 22 | 3
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 | 20 | 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,405 | 1,434
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 | 220 | 147
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,625 | 1,581
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 23 | 2
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 81 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,578 | 594
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 86 | 82
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,664 | 676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 92 | 15
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 423 | 65
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 8,440 | 3,698
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 75 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 717 | 234
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 9,157 | 3,932
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 498 | 74
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 | 17 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 445 | 340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 80 | 16
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 525 | 356
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 23 | 6
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 141 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,055 | 301
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 24 | 12
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,079 | 313
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 143 | 3
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 138 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,064 | 1,869
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 21 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 240 | 94
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,304 | 1,963
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 159 | 27
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 | 78 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,506 | 2,301
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33 | 23
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,539 | 2,324
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 82 | 14
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 | 920 | 121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 21,288 | 10,933
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 122 | 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,404 | 608
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 22,692 | 11,541
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 1,042 | $ 144

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