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Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Dec. 31, 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 | 3,933 |
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 | $ 1,088 | $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (14) | (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 407 | 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (25) | (39)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,495 | 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (39) | (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 | 78 | 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 | 78 | 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0 | (17)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 228 | 117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) | (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,299 | 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (244) | (341)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,527 | 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (248) | (348)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 5,883 | 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (138) | (10)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8,212 | 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (895) | (1,003)
Debt Securities, Available-for-sale, Unrealized Loss Position | 14,095 | 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (1,033) | (1,013)
Foreign government/government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 165 | 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 178 | 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (18) | (27)
Debt Securities, Available-for-sale, Unrealized Loss Position | 343 | 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (23) | (27)
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,263 | 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (27) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,712 | 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (320) | (296)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,975 | 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (347) | (299)
Residential mortgage-backed securities ("RMBS") |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,297 | 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (29) | (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,672 | 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (364) | (403)
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,969 | 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (393) | (406)
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 406 | 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (26) | (11)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 461 | 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (118) | (139)
Debt Securities, Available-for-sale, Unrealized Loss Position | 867 | 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (144) | (150)
Securities available-for-sale and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 10,408 | 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (243) | (41)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16,941 | 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,984) | (2,264)
Debt Securities, Available-for-sale, Unrealized Loss Position | 27,349 | 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (2,227) | $ (2,305)

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