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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Value	$ 298	$ 264	$ 314
Internal programs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Value	251	214	225
External programs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Value	44	44	73
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Carrying Value	$ 3	$ 6	$ 16