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Non-Interest Revenue and Expense Detail (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Details Of Certain Statements Of Income Lines Details [Abstract] |  |  |  |
Professional services |  | $ 3,008,000,000 axp_ProfessionalServices | $ 3,102,000,000 axp_ProfessionalServices | $ 2,963,000,000 axp_ProfessionalServices
Occupancy and equipment |  | 1,807,000,000 us-gaap_OccupancyNet | 1,904,000,000 us-gaap_OccupancyNet | 1,823,000,000 us-gaap_OccupancyNet
Card-related fraud losses |  | 369,000,000 axp_CardRelatedFraudLosses | 278,000,000 axp_CardRelatedFraudLosses | 278,000,000 axp_CardRelatedFraudLosses
Communications |  | 383,000,000 us-gaap_CommunicationsAndInformationTechnology | 379,000,000 us-gaap_CommunicationsAndInformationTechnology | 383,000,000 us-gaap_CommunicationsAndInformationTechnology
Gain on business travel joint venture transaction | (626,000,000)axp_DeconsolidationGainOrLossAmountBeforeTax | (630,000,000)axp_DeconsolidationGainOrLossAmountBeforeTax |  |
Other |  | 1,152,000,000 axp_OtherNetExpenses | 1,133,000,000 axp_OtherNetExpenses | 1,404,000,000 axp_OtherNetExpenses
Total Other, net |  | $ 6,089,000,000 us-gaap_OtherNoninterestExpense | $ 6,796,000,000 us-gaap_OtherNoninterestExpense | $ 6,851,000,000 us-gaap_OtherNoninterestExpense

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- Definition This represents expenses incurred with respect to card-related fraud losses + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Gain on business travel joint venture, before tax + References No definition available. + Details
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- Details
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- Definition Represents other, net expenses from miscellaneous items within other revenues not previously classified. + References No definition available. + Details
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Balance Type: | debit
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- Definition The aggregate amount of professional service fees and other processing expenses. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense in the period for communications and data processing expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(b)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Other noninterest expenses that are not separately presented in any other noninterest expense category. + 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 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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