Service Fees and Other Revenue and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Service Fees and Other Revenue and Other Expenses [Abstract]
Data processing and equipment	$ 623	$ 577	$ 1,223	$ 1,159
Professional services	501	458	973	861
Net unrealized and realized losses (gains) on Amex Ventures investments	10	(248)	21	(632)
Other	317	220	632	489
Total Other expenses	$ 1,451	$ 1,007	$ 2,849	$ 1,877