Loan Sale and Servicing Activities and Variable Interest Entities (Loan Sale and Servicing Activities and Variable Interest Entities) (Narrative) (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Billions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment Program, Proportional Amortization Method, Applied, Amortization Expense	$ 0.2	$ 0.2
Low Income Housing Tax Credit And Market Tax Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits	0.2	0.2
Other tax benefits	$ 0.1	$ 0.1