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Non-Interest Revenue and Expense Detail (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Details Of Certain Statements Of Income Lines Details [Abstract]      
Foreign currency conversion fee revenue $ 877,000,000axp_ForeignCurrencyGainLoss $ 877,000,000axp_ForeignCurrencyGainLoss $ 855,000,000axp_ForeignCurrencyGainLoss
Delinquency fees 722,000,000axp_DelinquencyFees 667,000,000axp_DelinquencyFees 604,000,000axp_DelinquencyFees
Loyalty Partner-related fees 383,000,000axp_LoyaltyPartner 310,000,000axp_LoyaltyPartner 290,000,000axp_LoyaltyPartner
Service fees 366,000,000axp_ServiceFees 375,000,000axp_ServiceFees 362,000,000axp_ServiceFees
Other 160,000,000axp_OtherCommissionsAndFees 185,000,000axp_OtherCommissionsAndFees 206,000,000axp_OtherCommissionsAndFees
Total Other commissions and fees $ 2,508,000,000us-gaap_FeesAndCommissionsOther $ 2,414,000,000us-gaap_FeesAndCommissionsOther $ 2,317,000,000us-gaap_FeesAndCommissionsOther