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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Sep. 30, 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 | 3,100 |
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] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 180 | $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 469 | 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19 | 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 649 | 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 19 | 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 | 262 | 209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 2,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 16
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 262 | 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 0 | 17
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 36 | 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 | 2,491 | 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 219 | 341
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,527 | 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 220 | 348
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 709 | 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,943 | 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 677 | 1,003
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 9,652 | 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 684 | 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 | 37 | 27
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, 12 Months or Longer | 250 | 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 287 | 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 13 | 27
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 251 | 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,907 | 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 248 | 296
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,158 | 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 249 | 299
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 237 | 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,876 | 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 281 | 403
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,113 | 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 282 | 406
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 205 | 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 502 | 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 81 | 139
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 707 | 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 82 | 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 | 1,917 | 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18,438 | 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,538 | 2,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 20,355 | 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 1,549 | $ 2,305

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