Line of Business Information - Summary of Line of Business (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Segment Reporting [Line Items] | ||||
| Servicing fees | $ 1,468,000,000 | $ 1,304,000,000 | $ 2,877,000,000 | $ 2,579,000,000 |
| Management fees | 772,000,000 | 600,000,000 | 1,496,000,000 | 1,187,000,000 |
| Foreign exchange trading services | 494,000,000 | 393,000,000 | 929,000,000 | 730,000,000 |
| Securities finance | 150,000,000 | 126,000,000 | 266,000,000 | 240,000,000 |
| Software services | 166,000,000 | 169,000,000 | 335,000,000 | 327,000,000 |
| Other fee revenue | 138,000,000 | 127,000,000 | 245,000,000 | 226,000,000 |
| Total fee revenue | 3,188,000,000 | 2,719,000,000 | 6,148,000,000 | 5,289,000,000 |
| Net interest income | 860,000,000 | 729,000,000 | 1,695,000,000 | 1,443,000,000 |
| Total other income | 0 | 0 | 1,000,000 | 0 |
| Total revenue | 4,048,000,000 | 3,448,000,000 | 7,844,000,000 | 6,732,000,000 |
| Provision for credit losses | 0 | 30,000,000 | 16,000,000 | 42,000,000 |
| Compensation and employee benefits expenses | 1,292,000,000 | 1,280,000,000 | 2,733,000,000 | 2,542,000,000 |
| Information systems and communications | 589,000,000 | 523,000,000 | 1,226,000,000 | 1,020,000,000 |
| Transaction processing services | 280,000,000 | 260,000,000 | 563,000,000 | 518,000,000 |
| Other | 498,000,000 | 466,000,000 | 948,000,000 | 899,000,000 |
| Total expenses | 2,659,000,000 | 2,529,000,000 | 5,470,000,000 | 4,979,000,000 |
| Income before income tax expense | $ 1,389,000,000 | $ 889,000,000 | $ 2,358,000,000 | $ 1,711,000,000 |
| Pre-tax margin | 34.00% | 26.00% | 30.00% | 25.00% |
| Average assets (in billions) | $ 366,800,000,000 | $ 353,800,000,000 | $ 359,300,000,000 | $ 345,500,000,000 |
| Operating Segments | Investment Servicing | ||||
| Segment Reporting [Line Items] | ||||
| Servicing fees | 1,468,000,000 | 1,304,000,000 | 2,877,000,000 | 2,579,000,000 |
| Management fees | 0 | 0 | 0 | 0 |
| Foreign exchange trading services | 491,000,000 | 390,000,000 | 923,000,000 | 727,000,000 |
| Securities finance | 140,000,000 | 119,000,000 | 250,000,000 | 227,000,000 |
| Software services | 166,000,000 | 193,000,000 | 335,000,000 | 351,000,000 |
| Other fee revenue | 117,000,000 | 112,000,000 | 219,000,000 | 213,000,000 |
| Total fee revenue | 2,382,000,000 | 2,118,000,000 | 4,604,000,000 | 4,097,000,000 |
| Net interest income | 860,000,000 | 726,000,000 | 1,692,000,000 | 1,435,000,000 |
| Total other income | 0 | 0 | 1,000,000 | 0 |
| Total revenue | 3,242,000,000 | 2,844,000,000 | 6,297,000,000 | 5,532,000,000 |
| Provision for credit losses | 0 | 30,000,000 | 16,000,000 | 42,000,000 |
| Compensation and employee benefits expenses | 1,127,000,000 | 1,033,000,000 | 2,314,000,000 | 2,135,000,000 |
| Information systems and communications | 566,000,000 | 481,000,000 | 1,124,000,000 | 958,000,000 |
| Transaction processing services | 228,000,000 | 221,000,000 | 458,000,000 | 438,000,000 |
| Other | 241,000,000 | 260,000,000 | 455,000,000 | 483,000,000 |
| Total expenses | 2,162,000,000 | 1,995,000,000 | 4,351,000,000 | 4,014,000,000 |
| Income before income tax expense | $ 1,080,000,000 | $ 819,000,000 | $ 1,930,000,000 | $ 1,476,000,000 |
| Pre-tax margin | 33.00% | 29.00% | 31.00% | 27.00% |
| Average assets (in billions) | $ 362,800,000,000 | $ 350,400,000,000 | $ 355,400,000,000 | $ 342,100,000,000 |
| Operating Segments | Investment Management | ||||
| Segment Reporting [Line Items] | ||||
| Servicing fees | 0 | 0 | 0 | 0 |
| Management fees | 772,000,000 | 600,000,000 | 1,496,000,000 | 1,187,000,000 |
| Foreign exchange trading services | 3,000,000 | 0 | 6,000,000 | 0 |
| Securities finance | 10,000,000 | 7,000,000 | 16,000,000 | 13,000,000 |
| Software services | 0 | 0 | 0 | 0 |
| Other fee revenue | 21,000,000 | 15,000,000 | 26,000,000 | 13,000,000 |
| Total fee revenue | 806,000,000 | 622,000,000 | 1,544,000,000 | 1,213,000,000 |
| Net interest income | 0 | 3,000,000 | 3,000,000 | 8,000,000 |
| Total other income | 0 | 0 | 0 | 0 |
| Total revenue | 806,000,000 | 625,000,000 | 1,547,000,000 | 1,221,000,000 |
| Provision for credit losses | 0 | 0 | 0 | 0 |
| Compensation and employee benefits expenses | 165,000,000 | 147,000,000 | 340,000,000 | 307,000,000 |
| Information systems and communications | 23,000,000 | 24,000,000 | 52,000,000 | 44,000,000 |
| Transaction processing services | 52,000,000 | 39,000,000 | 105,000,000 | 80,000,000 |
| Other | 257,000,000 | 207,000,000 | 492,000,000 | 417,000,000 |
| Total expenses | 497,000,000 | 417,000,000 | 989,000,000 | 848,000,000 |
| Income before income tax expense | $ 309,000,000 | $ 208,000,000 | $ 558,000,000 | $ 373,000,000 |
| Pre-tax margin | 38.00% | 33.00% | 36.00% | 31.00% |
| Average assets (in billions) | $ 4,000,000,000.0 | $ 3,400,000,000 | $ 3,900,000,000 | $ 3,400,000,000 |
| Other | ||||
| Segment Reporting [Line Items] | ||||
| Servicing fees | 0 | 0 | 0 | 0 |
| Management fees | 0 | 0 | 0 | 0 |
| Foreign exchange trading services | 0 | 3,000,000 | 0 | 3,000,000 |
| Securities finance | 0 | 0 | 0 | 0 |
| Software services | 0 | (24,000,000) | 0 | (24,000,000) |
| Other fee revenue | 0 | 0 | 0 | 0 |
| Total fee revenue | 0 | (21,000,000) | 0 | (21,000,000) |
| Net interest income | 0 | 0 | 0 | 0 |
| Total other income | 0 | 0 | 0 | 0 |
| Total revenue | 0 | (21,000,000) | 0 | (21,000,000) |
| Provision for credit losses | 0 | 0 | 0 | 0 |
| Compensation and employee benefits expenses | 0 | 100,000,000 | 79,000,000 | 100,000,000 |
| Information systems and communications | 0 | 18,000,000 | 50,000,000 | 18,000,000 |
| Transaction processing services | 0 | 0 | 0 | 0 |
| Other | 0 | (1,000,000) | 1,000,000 | (1,000,000) |
| Total expenses | 0 | 117,000,000 | 130,000,000 | 117,000,000 |
| Income before income tax expense | $ 0 | $ (138,000,000) | $ (130,000,000) | $ (138,000,000) |