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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 82 $ 85 $ 181 $ 205
Carrying Value $ 78 $ 90 $ 179 $ 216
Pre-Mod Interest Rate 15.64% 19.55% 16.57% 19.05%
Post-Mod Interest Rate 5.25% 3.27% 5.37% 3.72%
Net Charge-offs $ 14 $ 26 $ 33 $ 43
Direct/Indirect Consumer        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance 22 7 29 16
Carrying Value $ 14 $ 4 $ 18 $ 9
Pre-Mod Interest Rate 4.92% 4.13% 4.99% 4.50%
Post-Mod Interest Rate 4.53% 4.08% 4.37% 4.33%
United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance $ 60 $ 46 $ 152 $ 126
Carrying Value $ 64 $ 50 $ 161 $ 134
Pre-Mod Interest Rate 17.96% 17.48% 17.88% 17.42%
Post-Mod Interest Rate 5.40% 5.33% 5.49% 5.45%
Non United States | Credit Card Receivable        
Financing Receivable, Modifications [Line Items]        
Unpaid Principal Balance   $ 32   $ 63
Carrying Value   $ 36   $ 73
Pre-Mod Interest Rate   24.11%   23.93%
Post-Mod Interest Rate   0.38%   0.44%