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Business Combination - Unaudited Pro Forma (Details) - Comerica Incorporated - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Business Combination [Line Items]
Unaudited pro forma net income available to common shareholders	$ 904	$ 773	$ 1,668	$ 677
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Business Combination [Line Items]
Unaudited pro forma revenue	2,201	2,118	4,338	4,174
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Business Combination [Line Items]
Unaudited pro forma revenue	$ 1,059	$ 1,037	$ 2,066	$ 1,974

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