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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 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 | 4,033 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 94.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 570 | $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 775 | 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 | 1,345 | 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 38 | 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 | 474 | 209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 68 | 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 | 542 | 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1 | 17
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 126 | 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 | 2,640 | 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 300 | 341
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,766 | 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 301 | 348
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,476 | 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 54 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10,653 | 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,096 | 1,003
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 14,129 | 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,150 | 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 | 94 | 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 | 340 | 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 434 | 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 26 | 27
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 680 | 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,021 | 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 330 | 296
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,701 | 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 341 | 299
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 865 | 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,971 | 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 414 | 403
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,836 | 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 427 | 406
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 198 | 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 794 | 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 144 | 139
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 992 | 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 157 | 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 | 6,483 | 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 96 | 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 21,262 | 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,345 | 2,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 27,745 | 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 2,441 | $ 2,305

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