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Asset Securitizations (Details Textuals) - USD ($) $ in Billions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
American Express Lending Trust [Member] |  |
Securitized Trusts [Line Items] |  |
Subordinated securities owned | $ 1.2 | $ 1.2

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

X
- Definition Represents subordinated interests in the securitized cardmember loans, including rated and unrated investments in tranches of the securitization (subordinated securities). + References No definition available. + Details
Name: | axp_SubordinatedSecuritiesOwned
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=axp_AmericanExpressLendingTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |