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Non-Interest Revenue and Expense Detail (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Details Of Certain Statements Of Income Lines Details [Abstract]    
Foreign currency conversion fee revenue $ 211axp_ForeignCurrencyGainLoss $ 213axp_ForeignCurrencyGainLoss
Delinquency fees 195axp_DelinquencyFees 181axp_DelinquencyFees
Loyalty Partner-related fees 91axp_LoyaltyPartnerRelatedFees 91axp_LoyaltyPartnerRelatedFees
Service fees 87axp_ServiceFees 90axp_ServiceFees
Other 35axp_OtherCommissionsAndFees 43axp_OtherCommissionsAndFees
Total other commissions and fees $ 619us-gaap_FeesAndCommissionsOther $ 618us-gaap_FeesAndCommissionsOther