Service Fees and Other Revenue and Other Expenses - Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Service Fees and Other Revenue and Other Expenses [Abstract]
Data processing and equipment	$ 2,986	$ 2,888	$ 2,805
Professional services	2,424	2,274	2,029
Gain on sale of Accertify	0	(531)	0
Other	1,577	1,733	1,973
Total Other expenses	$ 6,987	$ 6,364	$ 6,807