Service Fees and Other Revenue and Other Expenses - Other Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Service Fees and Other Revenue and Other Expenses [Abstract]
Data processing and equipment	$ 2,888	$ 2,805	$ 2,606
Professional services	2,274	2,029	2,074
Gain on sale of Accertify	(531)	0	0
Other	1,733	1,973	1,801
Total Other expenses	$ 6,364	$ 6,807	$ 6,481