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Reserves For Losses (Details 3) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract]    
Card Member loans evaluated individually for impairment $ 305axp_CardmemberLoansEvaluatedSeparatelyForImpairment $ 286axp_CardmemberLoansEvaluatedSeparatelyForImpairment
Reserves on Card Member loans evaluated individually for impairment 65axp_ReservesOnCardmemberLoansEvaluatedSeparatelyForImpairment 67axp_ReservesOnCardmemberLoansEvaluatedSeparatelyForImpairment
Card Member loans evaluated collectively for impairment 66,530axp_CardmemberLoansEvaluatedCollectivelyForImpairment 70,099axp_CardmemberLoansEvaluatedCollectivelyForImpairment
Reserves on Card Member loans evaluated collectively for impairment $ 1,065axp_ReservesOnCardmemberLoansEvaluatedCollectivelyForImpairment $ 1,134axp_ReservesOnCardmemberLoansEvaluatedCollectivelyForImpairment