Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Guarantees (Details)

v3.10.0.1
Commitments and Contingencies - Other Guarantees (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Representations and Warranties Obligations and Corporate Guarantees          
Loss Contingencies [Line Items]          
Loss contingency accrual $ 2,100   $ 2,100   $ 1,900
Merchant Servicing Joint Venture          
Loss Contingencies [Line Items]          
Equity method investment ownership percentage 49.00%   49.00%    
Carrying value of investment $ 2,800   $ 2,800   2,900
Merchant Processing Servicers, Sponsored Entities          
Loss Contingencies [Line Items]          
Transactions processed and settled by sponsored entities 226,100 $ 204,600 426,800 $ 391,400  
Losses as result of cardholder disputed transactions 9 $ 8 17 $ 15  
Life Insurance Book Value Protection          
Loss Contingencies [Line Items]          
Notional amount of derivatives 10,400   10,400   10,400
Maximum potential exposure 1,600   1,600   1,600
Merchant Services | Merchant Processing Servicers, Sponsored Entities          
Loss Contingencies [Line Items]          
Maximum potential exposure 346,800   346,800   346,400
Other Guarantee          
Loss Contingencies [Line Items]          
Maximum potential exposure $ 6,200   $ 6,200   $ 5,900