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Asset Securitizations (Details Textuals) (American Express Travel Related Services Company Inc [Member], USD $) In Billions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
American Express Travel Related Services Company Inc [Member]
Securitized Trusts [Line Items]
Subordinated securities owned	$ 1.2axp_SubordinatedSecuritiesOwned / dei_LegalEntityAxis = axp_AmericanExpressTravelRelatedServicesCompanyIncMember	$ 1.2axp_SubordinatedSecuritiesOwned / dei_LegalEntityAxis = axp_AmericanExpressTravelRelatedServicesCompanyIncMember

X

- 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