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

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- Details
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Namespace Prefix: | axp_
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Balance Type: | na
Period Type: | duration

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

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