Service Fees and Other Revenue and Other Expenses - Service Fees and Other Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Non Interest Revenues [Line Items]
Total non-interest revenues	$ 54,865	$ 50,406	$ 47,381
Service fees and other revenue
Non Interest Revenues [Line Items]
Network partnership revenue	1,773	1,636	1,705
Loyalty coalition, merchant and other service fees	1,711	1,609	1,518
Foreign currency-related revenue	1,697	1,527	1,428
Delinquency fees	966	941	963
Travel commissions and fees	625	596	637
Other fees and revenues	700	456	459
Total non-interest revenues	$ 7,471	$ 6,765	$ 6,710