Business Segment Information - Business Segment Reconciliations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segments’ total revenue, net of interest expense (FTE basis)
Total revenue, net of interest expense (FTE basis)	$ 22,911	$ 23,157
Total revenue, net of interest expense	22,767	23,004
Net income	4,010	7,311
Operating Segments
Segments’ total revenue, net of interest expense (FTE basis)
Total revenue, net of interest expense (FTE basis)	23,890	23,788
Total revenue, net of interest expense	22,767	23,004
Net income	4,502	7,347
ALM activities
Segments’ total revenue, net of interest expense (FTE basis)
Total revenue, net of interest expense	(85)	12
Net income	(77)	18
Liquidating businesses, eliminations and other
Segments’ total revenue, net of interest expense (FTE basis)
Total revenue, net of interest expense	894	643
Net income	(415)	(54)
Segment Reconciling Items, Fully Taxable Equivalent Basis Adjustment
Segments’ total revenue, net of interest expense (FTE basis)
Total revenue, net of interest expense	$ (144)	$ (153)