Other Financial Data (Other Income (Expense)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest expense, net:
Interest expense	$ (225)	$ (186)	$ (147)
Interest income	20	13	21
Interest expense, net:	(205)	(173)	(126)
Other:
Loss from the extinguishment of long-term debt	(2)	0	(37)
Investment impairments	(4)	(6)	0
Foreign currency gain (loss)	46	(23)	(3)
Gain (loss) on derivative instruments	(56)	7	(4)
Gains on equity method investments	5	6	16
Realized foreign currency loss on acquisition	(10)	0	0
Other	9	5	(6)
Total other	$ (12)	$ (11)	$ (34)