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

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- Details
Name: | axp_CardmemberLoansAndRelatedReservesEvaluatedSeparatelyAndCollectivelyForImpairmentAbstract
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents cardmember loans evaluated collectively for impairment. + References No definition available. + Details
Name: | axp_CardmemberLoansEvaluatedCollectivelyForImpairment
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents cardmember loans that are evaluated separately for impairment. + References No definition available. + Details
Name: | axp_CardmemberLoansEvaluatedSeparatelyForImpairment
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents reserves on cardmember loans evaluated collectively for impairment. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents reserves on cardmember loans that are evaluated separately for impairment. + References No definition available. + Details
Name: | axp_ReservesOnCardmemberLoansEvaluatedSeparatelyForImpairment
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant