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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 3,648 |
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 | $ 567 | $ 1,088
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 306 | 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 18 | 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 873 | 1,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 24 | 39
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 900 | 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 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, Total | 900 | 78
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 2 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 146 | 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,261 | 2,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 200 | 244
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,407 | 2,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 204 | 248
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 5,022 | 5,883
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 85 | 138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,023 | 8,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 777 | 895
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 13,045 | 14,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 862 | 1,033
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 109 | 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 164 | 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 15 | 18
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 273 | 343
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 17 | 23
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,291 | 1,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 33 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,580 | 2,712
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 338 | 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,871 | 3,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 371 | 347
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 951 | 1,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,635 | 2,672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 312 | 364
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,586 | 3,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 325 | 393
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 35 | 406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 599 | 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 116 | 118
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 634 | 867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 118 | 144
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 | 9,021 | 10,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 147 | 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16,568 | 16,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,776 | 1,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 25,589 | 27,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 1,923 | $ 2,227

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