CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive loss to net income (net of $1, $10, $4 and $23 tax expense, respectively)	$ 1	$ 10	$ 4	$ 23
Net unrealized gains on securities still held (net of $19, $12, $45 and $19 tax expense, respectively)	19	12	45	19
Reclassification from accumulated other comprehensive loss to net income (net of $1, $3, $11 and $4 tax benefit, respectively)	(1)	(3)	(11)	(4)
Defined benefit pension and other benefits plans (net of $6 and $4 tax expense and $4 tax benefit, respectively)	6	0	4	(4)
Net unrealized gains on foreign currency translation (net of less than $1 tax expense for all periods)	1	1	1	1
Other comprehensive loss related to equity method investee (net of less than $1, $1 and $3 tax benefit, respectively)	$ (1)	$ (1)	$ 0	$ (3)