Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 29,131	$ 36,431	$ 32,474
Other comprehensive income/(loss), after–tax
Unrealized gains/(losses) on investment securities	4,123	2,855	(1,858)
Translation adjustments, net of hedges	234	20	20
Fair value hedges	19	30	(107)
Cash flow hedges	2,320	172	(201)
Defined benefit pension and OPEB plans	212	964	(373)
DVA on fair value option elected liabilities	(491)	(965)	1,043
Total other comprehensive income/(loss), after–tax	6,417	3,076	(1,476)
Comprehensive income	$ 35,548	$ 39,507	$ 30,998