Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Credit Card and Other Consumer - TDRs Entered into During the Period (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Credit Card and Other Consumer - TDRs Entered into During the Period (Details) - Credit card and other consumer - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 70 $ 106 $ 202 $ 253
Carrying Value $ 73 $ 106 $ 208 $ 251
Pre-Modification Interest Rate 18.06% 14.85% 17.99% 16.29%
Post-Modification Interest Rate 3.76% 6.63% 4.31% 5.83%
Credit card        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 66 $ 71 $ 189 $ 203
Carrying Value $ 71 $ 77 $ 200 $ 214
Pre-Modification Interest Rate 18.48% 18.19% 18.47% 18.06%
Post-Modification Interest Rate 3.71% 6.86% 4.26% 5.82%
Direct/indirect consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 4 $ 35 $ 13 $ 50
Carrying Value $ 2 $ 29 $ 8 $ 37
Pre-Modification Interest Rate 5.20% 6.02% 5.53% 5.87%
Post-Modification Interest Rate 5.20% 6.02% 5.53% 5.87%