Investment Securities - Amortized Costs and Estimated Fair Values (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Available-for-sale securities | |||||
| Amortized cost | $ 488,593,000,000 | $ 488,593,000,000 | $ 411,045,000,000 | ||
| Unallocated portfolio layer fair value basis adjustments, Amortized cost | 1,092,000,000 | 1,092,000,000 | (1,153,000,000) | ||
| Gross unrealized gains | 1,956,000,000 | 1,956,000,000 | 1,115,000,000 | ||
| Unallocated portfolio layer fair value basis adjustments, Gross unrealized gains | (1,092,000,000) | (1,092,000,000) | |||
| Gross unrealized losses | 5,169,000,000 | 5,169,000,000 | 5,308,000,000 | ||
| Unallocated portfolio layer fair value basis adjustments, Gross unrealized losses | (1,153,000,000) | ||||
| Fair value | 485,380,000,000 | 485,380,000,000 | 406,852,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 260,559,000,000 | 260,559,000,000 | 274,468,000,000 | ||
| Gross unrealized gains | 97,000,000 | 97,000,000 | 152,000,000 | ||
| Gross unrealized losses | 21,392,000,000 | 21,392,000,000 | 26,720,000,000 | ||
| Fair value | 239,264,000,000 | 239,264,000,000 | 247,900,000,000 | ||
| Total investment securities, net of allowance for credit losses | |||||
| Amortized cost | 749,152,000,000 | 749,152,000,000 | 685,513,000,000 | ||
| Gross unrealized gains | 2,053,000,000 | 2,053,000,000 | 1,267,000,000 | ||
| Gross unrealized losses | 26,561,000,000 | 26,561,000,000 | 32,028,000,000 | ||
| Fair value | 724,644,000,000 | 724,644,000,000 | 654,752,000,000 | ||
| HTM securities purchased | 1,600,000,000 | $ 555,000,000 | 3,200,000,000 | $ 1,000,000,000.0 | |
| Investment securities, allowance for credit losses | 108,000,000 | 177,000,000 | 108,000,000 | 177,000,000 | 152,000,000 |
| Accrued interest receivables on investment securities | 4,300,000,000 | 4,300,000,000 | 3,700,000,000 | ||
| Accrued interest receivables reversed through interest income on AFS securities | 0 | 0 | 0 | 0 | |
| Accrued interest receivables reversed through interest income on HTM securities | 0 | $ 0 | 0 | $ 0 | |
| Total mortgage-backed securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 107,113,000,000 | 107,113,000,000 | 104,628,000,000 | ||
| Gross unrealized gains | 803,000,000 | 803,000,000 | 290,000,000 | ||
| Gross unrealized losses | 3,058,000,000 | 3,058,000,000 | 4,149,000,000 | ||
| Fair value | 104,858,000,000 | 104,858,000,000 | 100,769,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 109,130,000,000 | 109,130,000,000 | 114,599,000,000 | ||
| Gross unrealized gains | 53,000,000 | 53,000,000 | 34,000,000 | ||
| Gross unrealized losses | 12,292,000,000 | 12,292,000,000 | 14,824,000,000 | ||
| Fair value | 96,891,000,000 | 96,891,000,000 | 99,809,000,000 | ||
| U.S. GSEs and government agencies mortgage-backed securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 96,286,000,000 | 96,286,000,000 | 95,671,000,000 | ||
| Gross unrealized gains | 735,000,000 | 735,000,000 | 251,000,000 | ||
| Gross unrealized losses | 2,986,000,000 | 2,986,000,000 | 4,029,000,000 | ||
| Fair value | 94,035,000,000 | 94,035,000,000 | 91,893,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 93,232,000,000 | 93,232,000,000 | 97,177,000,000 | ||
| Gross unrealized gains | 33,000,000 | 33,000,000 | 6,000,000 | ||
| Gross unrealized losses | 11,272,000,000 | 11,272,000,000 | 13,531,000,000 | ||
| Fair value | 81,993,000,000 | 81,993,000,000 | 83,652,000,000 | ||
| Residential: U.S. Mortgage-backed securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 5,496,000,000 | 5,496,000,000 | 4,242,000,000 | ||
| Gross unrealized gains | 22,000,000 | 22,000,000 | 16,000,000 | ||
| Gross unrealized losses | 29,000,000 | 29,000,000 | 50,000,000 | ||
| Fair value | 5,489,000,000 | 5,489,000,000 | 4,208,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 8,058,000,000 | 8,058,000,000 | 8,605,000,000 | ||
| Gross unrealized gains | 4,000,000 | 4,000,000 | 4,000,000 | ||
| Gross unrealized losses | 733,000,000 | 733,000,000 | 904,000,000 | ||
| Fair value | 7,329,000,000 | 7,329,000,000 | 7,705,000,000 | ||
| Residential: Non-U.S. mortgage-backed securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 465,000,000 | 465,000,000 | 600,000,000 | ||
| Gross unrealized gains | 1,000,000 | 1,000,000 | 3,000,000 | ||
| Gross unrealized losses | 0 | 0 | 0 | ||
| Fair value | 466,000,000 | 466,000,000 | 603,000,000 | ||
| Commercial mortgage-backed securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 4,866,000,000 | 4,866,000,000 | 4,115,000,000 | ||
| Gross unrealized gains | 45,000,000 | 45,000,000 | 20,000,000 | ||
| Gross unrealized losses | 43,000,000 | 43,000,000 | 70,000,000 | ||
| Fair value | 4,868,000,000 | 4,868,000,000 | 4,065,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 7,840,000,000 | 7,840,000,000 | 8,817,000,000 | ||
| Gross unrealized gains | 16,000,000 | 16,000,000 | 24,000,000 | ||
| Gross unrealized losses | 287,000,000 | 287,000,000 | 389,000,000 | ||
| Fair value | 7,569,000,000 | 7,569,000,000 | 8,452,000,000 | ||
| U.S. Treasury and government agencies | |||||
| Available-for-sale securities | |||||
| Amortized cost | 301,363,000,000 | 301,363,000,000 | 235,495,000,000 | ||
| Gross unrealized gains | 1,905,000,000 | 1,905,000,000 | 545,000,000 | ||
| Gross unrealized losses | 187,000,000 | 187,000,000 | 1,261,000,000 | ||
| Fair value | 303,081,000,000 | 303,081,000,000 | 234,779,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 108,236,000,000 | 108,236,000,000 | 108,632,000,000 | ||
| Gross unrealized gains | 0 | 0 | 0 | ||
| Gross unrealized losses | 8,076,000,000 | 8,076,000,000 | 11,212,000,000 | ||
| Fair value | 100,160,000,000 | 100,160,000,000 | 97,420,000,000 | ||
| Obligations of U.S. states and municipalities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 19,233,000,000 | 19,233,000,000 | 18,337,000,000 | ||
| Gross unrealized gains | 32,000,000 | 32,000,000 | 110,000,000 | ||
| Gross unrealized losses | 1,618,000,000 | 1,618,000,000 | 534,000,000 | ||
| Fair value | 17,647,000,000 | 17,647,000,000 | 17,913,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 9,022,000,000 | 9,022,000,000 | 9,310,000,000 | ||
| Gross unrealized gains | 2,000,000 | 2,000,000 | 32,000,000 | ||
| Gross unrealized losses | 971,000,000 | 971,000,000 | 631,000,000 | ||
| Fair value | 8,053,000,000 | 8,053,000,000 | 8,711,000,000 | ||
| Non-U.S. government debt securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 41,183,000,000 | 41,183,000,000 | 36,655,000,000 | ||
| Gross unrealized gains | 241,000,000 | 241,000,000 | 94,000,000 | ||
| Gross unrealized losses | 294,000,000 | 294,000,000 | 504,000,000 | ||
| Fair value | 41,130,000,000 | 41,130,000,000 | 36,245,000,000 | ||
| Corporate debt securities | |||||
| Available-for-sale securities | |||||
| Amortized cost | 122,000,000 | 122,000,000 | 71,000,000 | ||
| Gross unrealized gains | 1,000,000 | 1,000,000 | 0 | ||
| Gross unrealized losses | 0 | 0 | 1,000,000 | ||
| Fair value | 123,000,000 | 123,000,000 | 70,000,000 | ||
| Asset-backed securities: Collateralized loan obligations | |||||
| Available-for-sale securities | |||||
| Amortized cost | 16,420,000,000 | 16,420,000,000 | 14,887,000,000 | ||
| Gross unrealized gains | 45,000,000 | 45,000,000 | 59,000,000 | ||
| Gross unrealized losses | 5,000,000 | 5,000,000 | 3,000,000 | ||
| Fair value | 16,460,000,000 | 16,460,000,000 | 14,943,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 33,000,000,000 | 33,000,000,000 | 40,573,000,000 | ||
| Gross unrealized gains | 41,000,000 | 41,000,000 | 84,000,000 | ||
| Gross unrealized losses | 26,000,000 | 26,000,000 | 14,000,000 | ||
| Fair value | 33,015,000,000 | 33,015,000,000 | 40,643,000,000 | ||
| Asset-backed securities: Other | |||||
| Available-for-sale securities | |||||
| Amortized cost | 2,067,000,000 | 2,067,000,000 | 2,125,000,000 | ||
| Gross unrealized gains | 21,000,000 | 21,000,000 | 17,000,000 | ||
| Gross unrealized losses | 7,000,000 | 7,000,000 | 9,000,000 | ||
| Fair value | 2,081,000,000 | 2,081,000,000 | 2,133,000,000 | ||
| Held-to-maturity securities | |||||
| Amortized cost | 1,171,000,000 | 1,171,000,000 | 1,354,000,000 | ||
| Gross unrealized gains | 1,000,000 | 1,000,000 | 2,000,000 | ||
| Gross unrealized losses | 27,000,000 | 27,000,000 | 39,000,000 | ||
| Fair value | $ 1,145,000,000 | $ 1,145,000,000 | $ 1,317,000,000 | ||