Service Fees and Other Revenue and Other Expenses - Service Fees and Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Non Interest Income [Line Items]
Total Service fees and other revenue	$ 12,630	$ 11,939	$ 37,265	$ 35,186
Service fees and other revenue
Non Interest Income [Line Items]
Service fees	370	375	1,197	1,114
Foreign currency-related revenue	401	374	1,140	1,071
Delinquency fees	236	245	705	717
Travel commissions and fees	157	183	481	476
Other fees and revenues	103	84	316	333
Total Service fees and other revenue	$ 1,267	$ 1,261	$ 3,839	$ 3,711

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.

No definition available.

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