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Customer Deposits (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
U.S. retail deposits:    
Savings accounts - Direct $ 27,508us-gaap_InterestBearingDomesticDepositSavings $ 26,159us-gaap_InterestBearingDomesticDepositSavings
Certificates of deposit - Direct 317us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits 333us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Certificates of deposit - Third party 7,384axp_ThirdPartyCertificatesOfDeposit 7,838axp_ThirdPartyCertificatesOfDeposit
Sweep accounts - Third party 8,933axp_ThirdPartySweepAccounts 8,949axp_ThirdPartySweepAccounts
Other retail deposits:    
Non-U.S. deposits and U.S. non-interest bearing deposits 163us-gaap_InterestBearingDomesticDepositOtherTimeDeposit 173us-gaap_InterestBearingDomesticDepositOtherTimeDeposit
Card Member credit balances - U.S. and non-U.S. 623axp_DomesticAndForeignCardmemberCreditBalances 719axp_DomesticAndForeignCardmemberCreditBalances
Total customer deposits $ 44,928us-gaap_Deposits $ 44,171us-gaap_Deposits