CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net unrealized derivative instrument (losses) gains arising during the periods, tax	$ 0	$ 30	$ 29	$ 66
Reclassification adjustment for net derivative gains included in net income, tax	(4)	(3)	(14)	(5)
Net unrealized securities available for sale (losses) gains arising during the periods, tax	(17)	37	114	25
Other-than-temporary impairment not recognized in earnings on securities, tax	2	(4)	(11)	(15)
Reclassification of net securities losses (gains) to net income, tax	1	0	(1)	(5)
Amortization of actuarial loss, tax	$ 2	$ 0	$ 5	$ 3