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Other Fees and Commissions and Other Expenses (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Non Interest Income [Line Items] |  |
Delinquency fees | $ 260 | $ 251
Foreign currency conversion fee revenue | 193 | 230
Loyalty coalition-related fees | 108 | 114
Travel commissions and fees | 60 | 108
Service fees and other | 99 | 100
Other fees and commissions [Member] |  |
Non Interest Income [Line Items] |  |
Total Other fees and commissions | $ 720 | $ 803

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- Definition Represents amounts to cardmembers 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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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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
Period Type: | duration

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- Definition Represents fees generated by the Loyalty Partner business. + References No definition available. + Details
Name: | axp_Loyaltypartner
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | axp_NonInterestRevenuesLineItems
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | axp_RevenuesAndFees
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | axp_ServiceFeesAndOther
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Commissions and fees earned by charging clients transaction or management fees for selling and arranging travel and travel management services. Client transaction fee revenue is recognized at the time the client books the travel arrangements. Travel management services revenue is recognized over the contractual term of the agreement. The Company's travel suppliers (for example, airlines, hotels, car rental companies) pay commissions and fees on tickets issued, sales and other services based on contractual agreements. Commissions and fees from travel suppliers are generally recognized at the time a ticket is purchased or over the term of the contract. Commissions and fees that are based on actual usage that is unknown at time of purchase (for example, hotel and car rentals), are recognized when cash is received. + References No definition available. + Details
Name: | axp_TravelCommissionsAndFees
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | axp_ProductOrServicesAxis=us-gaap_FinancialServiceOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |