Quarterly report pursuant to Section 13 or 15(d)

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

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Outstanding Loans and Leases - 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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 119 $ 102 $ 302 $ 245
Carrying Value $ 118 $ 101 $ 300 $ 243
Pre-Modification Interest Rate 18.36% 17.94% 18.62% 18.16%
Post-Modification Interest Rate 5.36% 5.12% 5.34% 5.19%
Direct/Indirect Consumer        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 19 $ 18 $ 35 $ 33
Carrying Value $ 11 $ 10 $ 19 $ 19
Pre-Modification Interest Rate 5.32% 4.61% 5.23% 4.77%
Post-Modification Interest Rate 5.32% 4.50% 5.22% 4.58%
United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 100 $ 84 $ 267 $ 212
Carrying Value $ 107 $ 91 $ 281 $ 224
Pre-Modification Interest Rate 19.62% 19.45% 19.50% 19.30%
Post-Modification Interest Rate 5.36% 5.19% 5.35% 5.24%