Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 24,442	$ 21,745	$ 17,886
Other comprehensive income/(loss), after–tax
Unrealized gains/(losses) on investment securities	(2,144)	1,975	(4,070)
Translation adjustments, net of hedges	(15)	(11)	(41)
Cash flow hedges	51	44	(259)
Defined benefit pension and OPEB plans	111	(1,018)	1,467
Total other comprehensive income/(loss), after–tax	(1,997)	990	(2,903)
Comprehensive income	$ 22,445	$ 22,735	$ 14,983