CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,036	$ 942	$ 1,846	$ 1,955
After Tax
Net unrealized gains (losses) on securities available for sale	149	136	185	323
Net changes in securities held to maturity	23	25	46	46
Net unrealized gains (losses) on cash flow hedges	45	143	(21)	520
Foreign currency translation adjustments	31	(30)	48	(29)
Other	3	8	8	(3)
Other comprehensive income (loss), net of tax	251	282	266	857
Comprehensive income	$ 1,287	$ 1,224	$ 2,112	$ 2,812