Loan Sale and Servicing Activities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability related to investments in low income housing tax credits	$ 2,200	$ 2,000
Low Income Housing Tax Credit Investments
Amortization Recognized Low Income Housing Tax Credit Investments	400	300	$ 200
Tax Credits Recognized Low Income Housing Tax Credit Investments	400	300	200
Other tax benefits associated with qualified investments in low income housing tax credits (less than)	$ 100	$ 100	$ 100