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Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Dec. 31, 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 | 1,500 |
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 | $ 396 | $ 44
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, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 396 | 44
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3) | 0
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,434 | 758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | (2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 147 | 715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (5)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,581 | 1,473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2) | (7)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 594 | 410
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (7) | (17)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 82 | 19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8) | (4)
Debt Securities, Available-for-sale, Unrealized Loss Position | 676 | 429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (15) | (21)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,698 | 466
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (65) | (13)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 234 | 212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9) | (18)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,932 | 678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (74) | (31)
Foreign government/government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 340 | 24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 356 | 24
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (6) | 0
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 301 | 34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (3) | (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 313 | 34
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (3) | (1)
Residential mortgage-backed securities ("RMBS") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,869 | 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 94 | 21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,963 | 482
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (27) | (3)
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,301 | 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,324 | 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (14) | 0
Securities available-for-sale and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 10,933 | 2,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (121) | (36)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 608 | 967
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (23) | (27)
Debt Securities, Available-for-sale, Unrealized Loss Position | 11,541 | 3,203
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (144) | $ (63)

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