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Other assets - Tax Credit Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Assets [Abstract] |  |  |  |  |  |
Tax credit investments | $ 2,888 |  |  | $ 2,888 |  | $ 2,821
Tax credit investments, commitment | 897 |  |  | 897 |  | $ 951
Tax credit investments, commitment - remainder of 2025 | 271 |  |  | 271 |  |
Tax credit investments, commitment - 2026 | 128 |  |  | 128 |  |
Tax credit investments, commitment - 2027 | 128 |  |  | 128 |  |
Tax credit investments, commitment - 2028 | 89 |  |  | 89 |  |
Tax credit investments, commitment - 2029 | 79 |  |  | 79 |  |
Tax credit investments, commitment - 2030 and thereafter | 202 |  |  | 202 |  |
Tax credits and other tax benefits | 140 | $ 134 | $ 114 | 416 | $ 342 |
Amortization expense included in the provision for income taxes | $ 112 | $ 115 | $ 92 | $ 353 | $ 276 |

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