Other Fees and Commissions and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Fees and Commissions and Other Expenses [Abstract]
Data processing and equipment	$ 582	$ 549
Professional services	403	439
Net unrealized gains on Amex Ventures equity investments	(377)	(15)
Other	262	316
Total Other expenses	$ 870	$ 1,289