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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
Financing Receivable, Modified [Line Items]    
Carrying Value $ 298 $ 264
Internal programs    
Financing Receivable, Modified [Line Items]    
Carrying Value 251 214
External programs    
Financing Receivable, Modified [Line Items]    
Carrying Value 44 44
Other    
Financing Receivable, Modified [Line Items]    
Carrying Value $ 3 $ 6