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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 71 $ 114 $ 167 $ 211
Carrying Value $ 69 $ 113 $ 164 $ 210
Pre-Modification Interest Rate 16.61% 18.45% 17.07% 18.80%
Post-Modification Interest Rate 5.16% 5.36% 5.25% 5.30%
Credit Card        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 57 $ 95 $ 144 $ 184
Carrying Value $ 61 $ 102 $ 152 $ 195
Pre-Modification Interest Rate 18.08% 19.84% 18.02% 19.82%
Post-Modification Interest Rate 5.15% 5.38% 5.24% 5.32%
Direct/indirect consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 14 $ 19 $ 23 $ 27
Carrying Value $ 8 $ 11 $ 12 $ 15
Pre-Modification Interest Rate 5.26% 5.19% 5.31% 5.18%
Post-Modification Interest Rate 5.26% 5.16% 5.31% 5.16%