Business Combination - Unaudited Pro Forma (Details) - Comerica Incorporated - USD ($) $ in Millions |
3 Months Ended | |
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Mar. 31, 2026 |
Mar. 31, 2025 |
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| Business Combination [Line Items] | ||
| Unaudited pro forma net income available to common shareholders | $ 762 | $ 52 |
| Net Interest Income | ||
| Business Combination [Line Items] | ||
| Unaudited pro forma revenue | 2,133 | 2,058 |
| Non Interest Income | ||
| Business Combination [Line Items] | ||
| Unaudited pro forma revenue | $ 1,007 | $ 937 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of pro forma revenue of combined entity as if acquisition date of business combination occurred as of beginning of period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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