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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 68 $ 71 $ 148 $ 167
Carrying Value $ 72 $ 69 $ 154 $ 164
Pre-Modification Interest Rate 17.75% 16.61% 17.87% 17.07%
Post-Modification Interest Rate 4.31% 5.16% 4.58% 5.25%
Credit card        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 62 $ 57 $ 137 $ 144
Carrying Value $ 68 $ 61 $ 147 $ 152
Pre-Modification Interest Rate 18.44% 18.08% 18.48% 18.02%
Post-Modification Interest Rate 4.24% 5.15% 4.53% 5.24%
Direct/indirect consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 6 $ 14 $ 11 $ 23
Carrying Value $ 4 $ 8 $ 7 $ 12
Pre-Modification Interest Rate 5.64% 5.26% 5.62% 5.31%
Post-Modification Interest Rate 5.64% 5.26% 5.62% 5.31%