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Business Segments - Schedule of Movements Between Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information |  |  |  |  |  |  |
Net interest income (FTE) | $ 1,525 | $ 1,427 | $ 4,468 | $ 4,210 |  |  |
Income before income taxes (FTE) | 842 | 734 | 2,313 | 2,169 |  |  |
Average assets | 211,770 | 213,838 | 210,965 | 213,174 |  |  |
Operating Segments | Consumer and Small Business Banking |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Net interest income (FTE) | 1,082 | 1,056 | 3,141 | 3,287 |  |  |
Income before income taxes (FTE) | 665 | 647 | 1,836 | 1,980 |  |  |
Average assets | $ 56,762 | $ 52,552 | $ 55,630 | $ 51,920 |  |  |
Operating Segments | Consumer and Small Business Banking | Scenario, Adjustment |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |
Net interest income (FTE) |  |  |  |  | $ 103 | $ 135 | $ 74
Income before income taxes (FTE) |  |  |  |  | 68 | 105 | 43
Average assets |  |  |  |  | $ 714 | $ 686 | $ 660

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