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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 4,002 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 95.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 982 | $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 942 | 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 36 | 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,924 | 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 43 | 45
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,107 | 209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 295 | 2,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 16
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,402 | 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 5 | 17
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 59 | 117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,794 | 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 302 | 341
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,853 | 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 303 | 348
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,733 | 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 25 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,000 | 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,054 | 1,003
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 12,733 | 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,079 | 1,013
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 96 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 344 | 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 29 | 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 440 | 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 30 | 27
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 664 | 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,212 | 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 329 | 296
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,876 | 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 335 | 299
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 685 | 181
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, 12 Months or Longer | 3,061 | 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 418 | 403
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,746 | 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 426 | 406
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 287 | 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 999 | 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 164 | 139
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,286 | 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 178 | 150
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 | 5,613 | 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 66 | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 22,647 | 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,333 | 2,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 28,260 | 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 2,399 | $ 2,305

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