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Non-Interest Revenue and Expense Detail (Details 3) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Details Of Certain Statements Of Income Lines Details [Abstract]        
Professional services   $ 3,008,000,000axp_ProfessionalServices $ 3,102,000,000axp_ProfessionalServices $ 2,963,000,000axp_ProfessionalServices
Occupancy and equipment   1,807,000,000us-gaap_OccupancyNet 1,904,000,000us-gaap_OccupancyNet 1,823,000,000us-gaap_OccupancyNet
Card-related fraud losses   369,000,000axp_CardRelatedFraudLosses 278,000,000axp_CardRelatedFraudLosses 278,000,000axp_CardRelatedFraudLosses
Communications   383,000,000us-gaap_CommunicationsAndInformationTechnology 379,000,000us-gaap_CommunicationsAndInformationTechnology 383,000,000us-gaap_CommunicationsAndInformationTechnology
Gain on business travel joint venture transaction (626,000,000)axp_DeconsolidationGainOrLossAmountBeforeTax (630,000,000)axp_DeconsolidationGainOrLossAmountBeforeTax    
Other   1,152,000,000axp_OtherNetExpenses 1,133,000,000axp_OtherNetExpenses 1,404,000,000axp_OtherNetExpenses
Total Other, net   $ 6,089,000,000us-gaap_OtherNoninterestExpense $ 6,796,000,000us-gaap_OtherNoninterestExpense $ 6,851,000,000us-gaap_OtherNoninterestExpense