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Reserves For Losses (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract]      
Card Member loans evaluated separately for impairment $ 286axp_CardMemberLoansEvaluatedSeparatelyForImpairment $ 356axp_CardMemberLoansEvaluatedSeparatelyForImpairment $ 633axp_CardMemberLoansEvaluatedSeparatelyForImpairment
Reserves on Card Member loans evaluated separately for impairment 67axp_ReservesOnCardMemberLoansEvaluatedSeparatelyForImpairment 78axp_ReservesOnCardMemberLoansEvaluatedSeparatelyForImpairment 153axp_ReservesOnCardMemberLoansEvaluatedSeparatelyForImpairment
Card Member loans evaluated collectively for impairment 70,100axp_CardMemberLoansEvaluatedCollectivelyForImpairment 66,882axp_CardMemberLoansEvaluatedCollectivelyForImpairment 64,596axp_CardMemberLoansEvaluatedCollectivelyForImpairment
Reserves on Card Member loans evaluated collectively for impairment $ 1,134axp_ReservesOnCardMemberLoansEvaluatedCollectivelyForImpairment $ 1,183axp_ReservesOnCardMemberLoansEvaluatedCollectivelyForImpairment $ 1,318axp_ReservesOnCardMemberLoansEvaluatedCollectivelyForImpairment