Other Fees and Commissions and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Fees and Commissions and Other Expenses [Abstract]
Data processing and equipment	$ 613	$ 577	$ 1,772	$ 1,690
Professional services	490	421	1,351	1,266
Net unrealized and realized gains on Amex Ventures equity investments	(142)	(66)	(773)	(116)
Other	257	297	745	908
Total Other expenses	$ 1,218	$ 1,229	$ 3,095	$ 3,748