Loan Sale and Servicing Activities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability related to investments in low income housing tax credits	$ 2,100	$ 2,200
Low Income Housing Tax Credit Investments
Amortization Recognized Low Income Housing Tax Credit Investments		400	$ 300
Tax Credits Recognized Low Income Housing Tax Credit Investments		400	300
Other tax benefits associated with qualified investments in low income housing tax credits (less than)	100	$ 100	$ 100
LIHTC and NMTC
Amortization Recognized Low Income Housing Tax Credit Investments	400
Tax Credits Recognized Low Income Housing Tax Credit Investments	$ 400