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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 30, 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 | 3,135 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 93.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 548 | $ 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 | 248 | 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 17 | 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 796 | 1,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 23 | 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 | 555 | 78
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 | 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 | 555 | 78
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1 | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 107 | 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,065 | 2,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 178 | 244
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,172 | 2,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 183 | 248
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 3,289 | 5,883
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 66 | 138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,372 | 8,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 660 | 895
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 10,661 | 14,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 726 | 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 | 50 | 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 85 | 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 18
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 135 | 343
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 5 | 23
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,034 | 1,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 35 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,427 | 2,712
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 355 | 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,461 | 3,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 390 | 347
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 982 | 1,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,548 | 2,672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 295 | 364
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,530 | 3,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 309 | 393
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 229 | 406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8 | 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 577 | 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 129 | 118
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 806 | 867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 137 | 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 | 6,794 | 10,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 135 | 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 15,322 | 16,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,639 | 1,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 22,116 | 27,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 1,774 | $ 2,227

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