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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 106 $ 119 $ 253 $ 302
Carrying Value $ 106 $ 118 $ 251 $ 300
Pre-Modification Interest Rate 14.85% 18.36% 16.29% 18.62%
Post-Modification Interest Rate 6.63% 5.36% 5.83% 5.34%
Credit Card        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 71 $ 100 $ 203 $ 267
Carrying Value $ 77 $ 107 $ 214 $ 281
Pre-Modification Interest Rate 18.19% 19.62% 18.06% 19.50%
Post-Modification Interest Rate 6.86% 5.36% 5.82% 5.35%
Direct/indirect consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 35 $ 19 $ 50 $ 35
Carrying Value $ 29 $ 11 $ 37 $ 19
Pre-Modification Interest Rate 6.02% 5.32% 5.87% 5.23%
Post-Modification Interest Rate 6.02% 5.32% 5.87% 5.22%