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Goodwill - Narrative (Details) $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 01, 2026 USD ($) | Feb. 01, 2026 USD ($) | Jun. 30, 2026 USD ($) report | Dec. 31, 2025 USD ($)
Goodwill [Line Items] |  |  |  |
Acquisition activity |  |  | $ 5,043 | $ 29
Number of reporting units | report |  |  | 3 |
Comerica Incorporated |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquisition activity |  | $ 5,000 |  |
DUS |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquisition activity | $ 21 |  |  |

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