Service Fees and Other Revenue and Other Expenses - Service Fees and Other Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Non Interest Income [Line Items]
Total Service fees and other revenue	$ 14,988	$ 13,669	$ 29,203	$ 26,467
Service fees and other revenue
Non Interest Income [Line Items]
Foreign currency-related revenue	486	435	966	817
Network partnership revenue	480	438	929	846
Loyalty coalition, merchant and other service fees	448	407	912	843
Delinquency fees	249	238	504	475
Travel commissions and fees	176	148	326	284
Other fees and revenues	124	162	277	285
Total Service fees and other revenue	$ 1,963	$ 1,828	$ 3,914	$ 3,550

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