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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

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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