Condensed Consolidated Statements of Comprehensive Income (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]
Change in fair value of available-for-sale securities, income tax	$ 0	$ 0	$ 0	$ 0
Available-for-sale securities, reclassification to earnings, income tax	0	0	0	0
Foreign currency translation adjustments, income tax	(1)	1	0	1
Foreign currency, reclassification to earnings, income tax	0	0	0	0
Change in derivative fair value, income tax	(7)	22	39	22
Derivative reclassification to earnings, income tax	(4)	0	(5)	(6)
Pension, amortization of net actuarial gain (loss), income tax	(2)	(3)	(4)	(8)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	0	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	$ 0	$ 0	$ 0	$ 0