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Securities - Fair Value of Investments with Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 16,462 | $ 24,128
Less than 12 months, Unrealized losses | 71 | 341
12 months or more, Fair value | 27,425 | 35,333
12 months or more, Unrealized losses | 937 | 1,490
Total, Fair value | 43,887 | 59,461
Total, Unrealized losses | 1,008 | 1,831
U.S. Treasury |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 3,900 | 4,154
Less than 12 months, Unrealized losses | 8 | 15
12 months or more, Fair value | 7,077 | 8,334
12 months or more, Unrealized losses | 67 | 166
Total, Fair value | 10,977 | 12,488
Total, Unrealized losses | 75 | 181
Non-U.S. government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 6,605 | 7,283
Less than 12 months, Unrealized losses | 24 | 59
12 months or more, Fair value | 4,355 | 7,305
12 months or more, Unrealized losses | 169 | 297
Total, Fair value | 10,960 | 14,588
Total, Unrealized losses | 193 | 356
Agency residential mortgage-backed securities (“RMBS”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 3,375 | 10,469
Less than 12 months, Unrealized losses | 32 | 249
12 months or more, Fair value | 6,240 | 7,003
12 months or more, Unrealized losses | 252 | 326
Total, Fair value | 9,615 | 17,472
Total, Unrealized losses | 284 | 575
Agency commercial mortgage-backed securities (“MBS”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 243 | 554
Less than 12 months, Unrealized losses | 1 | 5
12 months or more, Fair value | 4,837 | 5,841
12 months or more, Unrealized losses | 144 | 242
Total, Fair value | 5,080 | 6,395
Total, Unrealized losses | 145 | 247
Foreign covered bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 768 | 892
Less than 12 months, Unrealized losses | 2 | 2
12 months or more, Fair value | 1,486 | 2,287
12 months or more, Unrealized losses | 57 | 92
Total, Fair value | 2,254 | 3,179
Total, Unrealized losses | 59 | 94
Non-agency commercial MBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 40 | 58
Less than 12 months, Unrealized losses | 0 | 0
12 months or more, Fair value | 1,950 | 2,127
12 months or more, Unrealized losses | 96 | 156
Total, Fair value | 1,990 | 2,185
Total, Unrealized losses | 96 | 156
Collateralized loan obligations (“CLOs”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 1,316 |
Less than 12 months, Unrealized losses | 2 |
12 months or more, Fair value | 0 |
12 months or more, Unrealized losses | 0 |
Total, Fair value | 1,316 |
Total, Unrealized losses | 2 |
Non-agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 185 | 139
Less than 12 months, Unrealized losses | 2 | 2
12 months or more, Fair value | 837 | 995
12 months or more, Unrealized losses | 126 | 161
Total, Fair value | 1,022 | 1,134
Total, Unrealized losses | 128 | 163
U.S. government agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 19 | 576
Less than 12 months, Unrealized losses | 0 | 9
12 months or more, Fair value | 323 | 905
12 months or more, Unrealized losses | 1 | 10
Total, Fair value | 342 | 1,481
Total, Unrealized losses | 1 | 19
Other asset-backed securities (“ABS”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | 11 | 3
Less than 12 months, Unrealized losses | 0 | 0
12 months or more, Fair value | 320 | 536
12 months or more, Unrealized losses | 25 | 40
Total, Fair value | 331 | 539
Total, Unrealized losses | $ 25 | $ 40

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