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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 91 $ 59 $ 168 $ 111
Carrying Value $ 89 $ 61 $ 165 $ 112
Pre-Modification Interest Rate 17.29% 17.31% 17.63% 17.39%
Post-Modification Interest Rate 5.18% 5.21% 5.19% 5.24%
Net charge-offs $ 14 $ 13 $ 22 $ 19
Direct/Indirect Consumer        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance 19 7 28 11
Carrying Value $ 11 $ 4 $ 16 $ 6
Pre-Modification Interest Rate 4.43% 4.14% 4.73% 4.12%
Post-Modification Interest Rate 4.43% 4.08% 4.56% 4.04%
United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 72 $ 52 $ 140 $ 100
Carrying Value $ 78 $ 57 $ 149 $ 106
Pre-Modification Interest Rate 19.18% 18.31% 19.06% 18.19%
Post-Modification Interest Rate 5.29% 5.30% 5.26% 5.32%