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Loans and the Allowance for Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Federal Home Loan Bank (FHLB)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged financial instruments, loans receivable, FHLB	$ 15,400	$ 15,400
Federal Reserve Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged Assets, Loans Receivable, FRB	14,100	14,100
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales-type and direct financing lease receivable	1,300	1,300
Sales-Type and Direct Financing		38
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual, No Allowance			$ 127
Consumer Unsecured Loans sold in period
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables, book balance sold in period	1,200
Allowance for loan losses, related to loans sold prior to sale	94	94
Financing Receiable, Allowance for Credit loss, writeoff on loans sold	63
Allowance for Loan and Lease Losses, Loans Sold	31
CommercialandInvestorRealEstatePortfoliosSegmentMember
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Nonaccrual, No Allowance	$ 254	$ 254

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