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Intangible Assets - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 01, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	May 01, 2026
Intangible Asset, Finite-Lived
Amortization expense		$ 63	$ 7	$ 108	$ 15
DUS
Intangible Asset, Finite-Lived
Acquired finite-lived intangible asset						$ 83
Comerica Incorporated
Intangible Asset, Finite-Lived
Acquired finite-lived intangible asset	$ 1,209
Core deposit intangibles | Comerica Incorporated
Intangible Asset, Finite-Lived
Acquired finite-lived intangible asset	$ 1,200
Weighted-average useful life, acquired finite-lived intangible assets	10 years

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