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Business Events (Details Textuals) $ in Billions | Mar. 31, 2018 USD ($)
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Business Events (Line Items) |
Value of outstanding principal and interest of purchased loans at acquisition of the acquired Hilton portfolio | $ 1

X
- Definition Business Events for the period + References No definition available. + Details
Name: | axp_BusinessEventsLineItems
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | axp_ValueOfOutstandingPrincipalAndInterestOfPurchasedLoansAtAcquisition
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant