Other Fees and Commissions and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Fees and Commissions and Other Expenses [Abstract]
Data processing and equipment	$ 577	$ 564	$ 1,159	$ 1,113
Professional services	458	406	861	845
Net unrealized gains on Amex Ventures equity investments	(248)	(7)	(625)	(22)
Other	220	267	482	583
Total Other expenses	$ 1,007	$ 1,230	$ 1,877	$ 2,519