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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale: |  |
Amortized cost | $ 100,656 | $ 89,627
Gains | 341 | 143
Losses | 1,008 | 1,739
Fair value | 99,989 | 88,031
Amortized cost, before Portfolio level basis adjustment | 100,592 | 89,719
Gross unrealized gains, before portfolio level basis adjustments | 405 |
Gross unrealized losses, before portfolio level basis adjustments |  | 1,831
Portfolio level basis adjustment, excluded from amortized cost | 64 | (92)
Portfolio level basis adjustments, gross unrealized gains (losses) | 64 | (92)
Held-to-maturity: |  |
Amortized cost | 49,539 | 48,596
Gains | 75 | 15
Losses | 3,100 | 4,591
Fair value | 46,514 | 44,020
Amortized cost, Total | 150,195 | 138,223
Gross unrealized, Gain, Total | 416 | 158
Gross unrealized, Losses, Total | 4,108 | 6,330
Fair value, Total | 146,503 | 132,051
Non-U.S. government |  |
Available-for-sale: |  |
Amortized cost | 28,590 | 25,042
Gains | 98 | 61
Losses | 193 | 356
Fair value | 28,495 | 24,747
Held-to-maturity: |  |
Amortized cost | 5,815 | 4,479
Gains | 25 | 8
Losses | 21 | 36
Fair value | 5,819 | 4,451
Agency residential mortgage-backed securities (“RMBS”) |  |
Available-for-sale: |  |
Amortized cost | 21,130 | 20,459
Gains | 171 | 16
Losses | 284 | 575
Fair value | 21,017 | 19,900
Held-to-maturity: |  |
Amortized cost | 26,439 | 25,824
Gains | 29 | 4
Losses | 2,521 | 3,545
Fair value | 23,947 | 22,283
U.S. Treasury |  |
Available-for-sale: |  |
Amortized cost | 24,232 | 16,575
Gains | 69 | 9
Losses | 75 | 181
Fair value | 24,226 | 16,403
Held-to-maturity: |  |
Amortized cost | 8,818 | 8,833
Gains | 13 | 0
Losses | 218 | 443
Fair value | 8,613 | 8,390
Foreign covered bonds |  |
Available-for-sale: |  |
Amortized cost | 7,779 | 7,129
Gains | 42 | 33
Losses | 59 | 94
Fair value | 7,762 | 7,068
Held-to-maturity: |  |
Amortized cost | 734 | 555
Gains | 3 | 1
Losses | 0 | 1
Fair value | 737 | 555
Agency commercial mortgage-backed securities (“MBS”) |  |
Available-for-sale: |  |
Amortized cost | 6,920 | 7,467
Gains | 10 | 5
Losses | 145 | 247
Fair value | 6,785 | 7,225
Held-to-maturity: |  |
Amortized cost | 3,017 | 3,395
Gains | 2 | 0
Losses | 138 | 243
Fair value | 2,881 | 3,152
Collateralized loan obligations (“CLOs”) |  |
Available-for-sale: |  |
Amortized cost | 6,122 | 5,809
Gains | 5 | 10
Losses | 2 | 0
Fair value | 6,125 | 5,819
Held-to-maturity: |  |
Amortized cost | 1,971 | 1,816
Gains | 3 | 2
Losses | 2 | 0
Fair value | 1,972 | 1,818
Non-agency commercial MBS |  |
Available-for-sale: |  |
Amortized cost | 2,305 | 2,641
Gains | 1 | 2
Losses | 96 | 156
Fair value | 2,210 | 2,487
U.S. government agencies |  |
Available-for-sale: |  |
Amortized cost | 1,555 | 2,304
Gains | 6 | 4
Losses | 1 | 19
Fair value | 1,560 | 2,289
Held-to-maturity: |  |
Amortized cost | 2,734 | 3,669
Gains | 0 | 0
Losses | 199 | 322
Fair value | 2,535 | 3,347
Non-agency RMBS |  |
Available-for-sale: |  |
Amortized cost | 1,533 | 1,639
Gains | 2 | 2
Losses | 128 | 163
Fair value | 1,407 | 1,478
Held-to-maturity: |  |
Amortized cost |  | 14
Gains |  | 0
Losses |  | 0
Fair value |  | 14
Other asset-backed securities (“ABS”) |  |
Available-for-sale: |  |
Amortized cost | 426 | 654
Gains | 1 | 1
Losses | 25 | 40
Fair value | 402 | 615
Other debt securities |  |
Held-to-maturity: |  |
Amortized cost | 11 | 11
Gains | 0 | 0
Losses | 1 | 1
Fair value | $ 10 | $ 10

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