Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Guarantees (Details)

v3.8.0.1
Commitments and Contingencies - Other Guarantees (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Representations and Warranties Obligations and Corporate Guarantees      
Loss Contingencies [Line Items]      
Loss contingency accrual $ 2,000   $ 1,900
Merchant Servicing Joint Venture      
Loss Contingencies [Line Items]      
Equity method investment ownership percentage 49.00%    
Carrying value of investment $ 2,800   2,900
Merchant Processing Servicers, Sponsored Entities      
Loss Contingencies [Line Items]      
Transactions processed and settled by sponsored entities 200,700 $ 186,800  
Losses as result of cardholder disputed transactions 8 $ 7  
Life Insurance Book Value Protection      
Loss Contingencies [Line Items]      
Notional amount of derivatives 10,300   10,400
Maximum potential exposure 1,600   1,600
Guarantees, fair value 1   3
Merchant Services | Merchant Processing Servicers, Sponsored Entities      
Loss Contingencies [Line Items]      
Maximum potential exposure 343,300   346,400
Other Guarantee      
Loss Contingencies [Line Items]      
Maximum potential exposure $ 6,000   $ 5,900