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Customer Deposits (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
U.S.:    
Interest-bearing $ 43,279us-gaap_InterestBearingDepositLiabilitiesDomestic $ 40,831us-gaap_InterestBearingDepositLiabilitiesDomestic
Non-interest-bearing 418us-gaap_NoninterestBearingDepositLiabilitiesDomestic 360us-gaap_NoninterestBearingDepositLiabilitiesDomestic
Non-U.S.:    
Interest-bearing 115us-gaap_InterestBearingDepositLiabilitiesForeign 121us-gaap_InterestBearingDepositLiabilitiesForeign
Non-interest-bearing 359us-gaap_NoninterestBearingDepositLiabilitiesForeign 451us-gaap_NoninterestBearingDepositLiabilitiesForeign
Total customer deposits 44,171us-gaap_Deposits 41,763us-gaap_Deposits
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 372us-gaap_NoninterestBearingDepositLiabilitiesDomestic
/ axp_CreditBalancesAxis
= axp_CardMemberCreditBalancesMember		 340us-gaap_NoninterestBearingDepositLiabilitiesDomestic
/ axp_CreditBalancesAxis
= axp_CardMemberCreditBalancesMember
Non-U.S.:    
Non-interest-bearing $ 347us-gaap_NoninterestBearingDepositLiabilitiesForeign
/ axp_CreditBalancesAxis
= axp_CardMemberCreditBalancesMember		 $ 437us-gaap_NoninterestBearingDepositLiabilitiesForeign
/ axp_CreditBalancesAxis
= axp_CardMemberCreditBalancesMember