Outstanding Loans and Leases and Allowance for Credit Losses - Credit Card and Other Consumer - TDRs Modified by Program Type (Details) - Credit card and other consumer - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Financing Receivable, Modified [Line Items]
Carrying Value	$ 92	$ 210
Internal programs
Financing Receivable, Modified [Line Items]
Carrying Value	77	174
External programs
Financing Receivable, Modified [Line Items]
Carrying Value	13	32
Other
Financing Receivable, Modified [Line Items]
Carrying Value	$ 2	$ 4