Basis of Presentation - Impact on Consolidated Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Investment banking fees	$ 7,550	$ 7,412	$ 6,572
Asset management, administration and commissions	17,118	16,287	15,364
Other income	5,343	3,646	3,799
Total net revenue	109,029	100,705	96,569
Noninterest expense
Compensation expense	33,117	31,208	30,203
Technology, communications and equipment expense	8,802	7,715	6,853
Professional and outside services	8,502	7,890	7,526
Other expense	5,731	6,079	5,555
Total noninterest expense	$ 63,394	59,515	56,672
Accounting Standards Update 2014-09 and Accounting Standards Update 2017-07
Revenue
Investment banking fees		7,412	6,572
Asset management, administration and commissions		16,287	15,364
Other income		3,646	3,799
Total net revenue		100,705	96,569
Noninterest expense
Compensation expense		31,208	30,203
Technology, communications and equipment expense		7,715	6,853
Professional and outside services		7,890	7,526
Other expense		6,079	5,555
Total noninterest expense		59,515	56,672
Reported
Revenue
Investment banking fees		7,248	6,448
Asset management, administration and commissions		15,377	14,591
Other income		3,639	3,795
Total net revenue		99,624	95,668
Noninterest expense
Compensation expense		31,009	29,979
Technology, communications and equipment expense		7,706	6,846
Professional and outside services		6,840	6,655
Other expense		6,256	5,756
Total noninterest expense		58,434	55,771
Revisions
Revenue
Investment banking fees		164	124
Asset management, administration and commissions		910	773
Other income		7	4
Total net revenue		1,081	901
Noninterest expense
Compensation expense		199	224
Technology, communications and equipment expense		9	7
Professional and outside services		1,050	871
Other expense		(177)	(201)
Total noninterest expense		$ 1,081	$ 901