Loan Sale and Servicing Activities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability related to investments in low income housing tax credits	$ 2.2	$ 2.1
Low Income Housing Tax Credit Investments
Amortization Recognized Low Income Housing Tax Credit Investments	0.5	0.4	$ 0.4
Tax Credits Recognized Low Income Housing Tax Credit Investments	0.5	0.4	0.4
Other tax benefits associated with qualified investments in low income housing tax credits (less than)	$ 0.1	$ 0.1	$ 0.1