Other Fees and Commissions and Other Expenses (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Fees and Commissions and Other Expenses [Abstract]
Occupancy and equipment	$ 577	$ 544	$ 1,690	$ 1,569
Professional services	421	491	1,266	1,497
Other	231	317	792	1,285
Total Other expenses	$ 1,229	$ 1,352	$ 3,748	$ 4,351