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Customer Deposits (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
U.S.:    
Interest-bearing $ 44,142us-gaap_InterestBearingDepositLiabilitiesDomestic $ 43,279us-gaap_InterestBearingDepositLiabilitiesDomestic
Non-interest-bearing 356us-gaap_NoninterestBearingDepositLiabilitiesDomestic 418us-gaap_NoninterestBearingDepositLiabilitiesDomestic
Non-U.S.:    
Interest-bearing 113us-gaap_InterestBearingDepositLiabilitiesForeign 115us-gaap_InterestBearingDepositLiabilitiesForeign
Non-interest-bearing 317us-gaap_NoninterestBearingDepositLiabilitiesForeign 359us-gaap_NoninterestBearingDepositLiabilitiesForeign
Total customer deposits 44,928us-gaap_Deposits 44,171us-gaap_Deposits
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 317us-gaap_NoninterestBearingDepositLiabilitiesDomestic
/ axp_CreditBalancesAxis
= axp_CardmemberCreditBalancesMember		 372us-gaap_NoninterestBearingDepositLiabilitiesDomestic
/ axp_CreditBalancesAxis
= axp_CardmemberCreditBalancesMember
Non-U.S.:    
Non-interest-bearing $ 306us-gaap_NoninterestBearingDepositLiabilitiesForeign
/ axp_CreditBalancesAxis
= axp_CardmemberCreditBalancesMember		 $ 347us-gaap_NoninterestBearingDepositLiabilitiesForeign
/ axp_CreditBalancesAxis
= axp_CardmemberCreditBalancesMember