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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Representations and Warranties Obligations and Corporate Guarantees          
Loss Contingencies [Line Items]          
Loss contingency accrual $ 2,000   $ 2,000   $ 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 220,000 $ 200,400 646,900 $ 591,800  
Losses as result of cardholder disputed transactions 6 $ 7 23 $ 22  
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 363,000   363,000   346,400
Other Guarantee          
Loss Contingencies [Line Items]          
Maximum potential exposure $ 6,000   $ 6,000   $ 5,900