Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - Low Income Housing Tax Credit Investments - USD ($) $ in Billions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortization	$ 0.3
Tax credits	0.3
Other tax benefits	$ 0.1
Amortization, tax credits, and other tax benefits recognized low income housing tax credit investments (less than)		$ 0.1