Other Financial Data (Other Income (Expense)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest expense, net:
Interest expense	$ (147)	$ (132)	$ (108)
Interest income	21	19	42
Interest expense, net:	(126)	(113)	(66)
Other:
Loss from the extinguishment of long-term debt	(37)	0	(6)
Investment impairments	0	(3)	(4)
Foreign currency loss	(7)	(9)	(1)
Gains on equity method investments	16	10	3
Other	(6)	11	9
Total Other	$ (34)	$ 9	$ 1