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Basis of Presentation - Business Events (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2025 | Apr. 16, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loans reclassified to held for sale | $ 1,600 |  |  |  |  |  |
Reversal of reserve for credit losses |  |  | $ (1,287) | $ (1,356) |  | $ (3,842) | $ (3,893)
Gain on sale of Accertify |  |  | $ 0 | $ 0 |  | $ 0 | $ 531
Accertify |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain on sale of Accertify |  |  |  |  | $ 531 |  |
Gain on sale of Accertify, net of tax |  |  |  |  | $ 479 |  |
CS |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Goodwill acquired during period |  | $ 590 |  |  |  |  |

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