Service Fees and Other Revenue and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Service Fees and Other Revenue and Other Expenses [Abstract]
Data processing and equipment	$ 600	$ 582
Professional services	472	403
Net unrealized and realized losses (gains) on Amex Ventures equity investments	11	(384)
Other	315	269
Total Other expenses	$ 1,398	$ 870