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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 5,020 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 88.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,683 | $ 1,577
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 27 | 50
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,211 | 281
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 59 | 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,894 | 1,858
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 86 | 75
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 115 | 1,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 48
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,597 | 1,378
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 54
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 2,712 | 2,868
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 26 | 102
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 192 | 2,560
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12 | 270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,845 | 521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 419 | 88
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,037 | 3,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 431 | 358
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,473 | 11,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 146 | 1,071
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,098 | 2,575
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,585 | 521
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 15,571 | 13,732
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,731 | 1,592
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 110 | 308
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 413 | 224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 44 | 23
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 523 | 532
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 47 | 49
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,614 | 4,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 74 | 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,076 | 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 571 | 54
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,690 | 4,498
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 645 | 515
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 644 | 2,311
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 20 | 249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,123 | 1,250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 556 | 259
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,767 | 3,561
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 576 | 508
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 349 | 1,554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23 | 145
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,578 | 633
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 250 | 98
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,927 | 2,187
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 273 | 243
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 | 9,180 | 25,227
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 306 | 2,320
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 25,941 | 7,090
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,509 | 1,122
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 35,121 | 32,317
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 3,815 | $ 3,442

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