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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 59 $ 81 $ 111 $ 152
Carrying Value $ 61 $ 87 $ 112 $ 162
Pre-Modification Interest Rate 17.31% 19.54% 17.39% 19.30%
Post-Modification Interest Rate 5.21% 3.30% 5.24% 3.47%
Net Charge-offs $ 13 $ 13 $ 19 $ 17
Direct/Indirect Consumer        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance 7 7 11 12
Carrying Value $ 4 $ 4 $ 6 $ 7
Pre-Modification Interest Rate 4.14% 4.52% 4.12% 4.50%
Post-Modification Interest Rate 4.08% 4.34% 4.04% 4.29%
Net Charge-offs $ 3 $ 3 $ 7 $ 5
United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance 52 44 100 87
Carrying Value $ 57 $ 47 $ 106 $ 93
Pre-Modification Interest Rate 18.31% 17.57% 18.19% 17.47%
Post-Modification Interest Rate 5.30% 5.41% 5.32% 5.47%
Net Charge-offs $ 4 $ 3 $ 5 $ 4
Non United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance   30   53
Carrying Value   $ 36   $ 62
Pre-Modification Interest Rate   24.01%   23.80%
Post-Modification Interest Rate   0.35%   0.37%
Net Charge-offs $ 6 $ 7 $ 7 $ 8