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Non-Interest Revenue and Expense Detail (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Details Of Certain Statements Of Income Lines Details [Abstract] |  |  |
Foreign currency conversion fee revenue | $ 877,000,000 axp_ForeignCurrencyGainLoss | $ 877,000,000 axp_ForeignCurrencyGainLoss | $ 855,000,000 axp_ForeignCurrencyGainLoss
Delinquency fees | 722,000,000 axp_DelinquencyFees | 667,000,000 axp_DelinquencyFees | 604,000,000 axp_DelinquencyFees
Loyalty Partner-related fees | 383,000,000 axp_LoyaltyPartner | 310,000,000 axp_LoyaltyPartner | 290,000,000 axp_LoyaltyPartner
Service fees | 366,000,000 axp_ServiceFees | 375,000,000 axp_ServiceFees | 362,000,000 axp_ServiceFees
Other | 160,000,000 axp_OtherCommissionsAndFees | 185,000,000 axp_OtherCommissionsAndFees | 206,000,000 axp_OtherCommissionsAndFees
Total Other commissions and fees | $ 2,508,000,000 us-gaap_FeesAndCommissionsOther | $ 2,414,000,000 us-gaap_FeesAndCommissionsOther | $ 2,317,000,000 us-gaap_FeesAndCommissionsOther

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- Definition Represents amounts to Card Members for failure to pay the outstanding (or minimum balance) on their cards by the due date. + References No definition available. + Details
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Balance Type: | credit
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- Details
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Balance Type: | na
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- Definition Primary financial statement caption in which reported facts about foreign currency gain (loss) have been included. + 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 fees generated by the Loyalty Partner business. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents revenues from miscellaneous items within other commissions and fees not previously classified. + References No definition available. + Details
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Balance Type: | credit
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- Definition Fee for services rendered usually based on a percentage of an amount received or collected or agreed to be paid for professional services. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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