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Other Assets (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Assets Details [Abstract]      
Goodwill $ 3,024,000,000us-gaap_Goodwill $ 3,198,000,000us-gaap_Goodwill $ 3,181,000,000us-gaap_Goodwill
Deferred tax assets, net 2,110,000,000axp_DeferredTaxAssetsOtherNet 2,443,000,000axp_DeferredTaxAssetsOtherNet  
Prepaid expenses 1,626,000,000us-gaap_PrepaidExpenseCurrentAndNoncurrent 1,998,000,000us-gaap_PrepaidExpenseCurrentAndNoncurrent  
Other intangible assets, at amortized cost 854,000,000us-gaap_FiniteLivedIntangibleAssetsNet 817,000,000us-gaap_FiniteLivedIntangibleAssetsNet  
Derivative assets 711,000,000us-gaap_DerivativeAssets 329,000,000us-gaap_DerivativeAssets  
Restricted cash 384,000,000us-gaap_RestrictedCashAndCashEquivalents 486,000,000us-gaap_RestrictedCashAndCashEquivalents  
Other 2,633,000,000axp_RemainingOtherAssets 1,957,000,000axp_RemainingOtherAssets  
Other assets (includes restricted cash of consolidated variable interest entities) $ 11,342,000,000us-gaap_OtherAssets $ 11,228,000,000us-gaap_OtherAssets