Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 320 $ 240 $ 250
Carrying Value $ 315 $ 235 $ 260
Pre-Modification Interest Rate 18.45% 17.17% 18.73%
Post-Modification Interest Rate 5.22% 5.22% 3.93%
Direct/Indirect Consumer      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 42 $ 37 $ 21
Carrying Value $ 23 $ 22 $ 13
Pre-Modification Interest Rate 5.10% 4.81% 3.44%
Post-Modification Interest Rate 4.95% 4.30% 3.29%
United States | Credit Card Receivable      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 278 $ 203 $ 163
Carrying Value $ 292 $ 213 $ 172
Pre-Modification Interest Rate 19.49% 18.47% 17.54%
Post-Modification Interest Rate 5.24% 5.32% 5.47%
Non United States | Credit Card Receivable      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance     $ 66
Carrying Value     $ 75
Pre-Modification Interest Rate     23.99%
Post-Modification Interest Rate     0.52%