Other Financial Data (Other Income (Expense)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest expense, net:
Interest expense	$ (186)	$ (147)	$ (132)
Interest income	13	21	19
Interest expense, net:	(173)	(126)	(113)
Other:
Loss from the extinguishment of long-term debt	0	(37)	0
Investment impairments	(6)	0	(3)
Foreign currency loss	(23)	(3)	(17)
Gain (loss) on derivative instruments	7	(4)	8
Gains on equity method investments	6	16	10
Other	5	(6)	11
Total Other	$ (11)	$ (34)	$ 9