Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Information
Consolidated segment Adjusted OIBDA	$ 93	$ 111	$ 260	$ 281
Stock-based compensation	(27)	(24)	(77)	(68)
Depreciation And amortization	(50)	(56)	(161)	(166)
Operating Income (Loss)	16	31	22	47
Interest expense	(6)	(5)	(18)	(20)
Realized and Unrealized Gain (Loss) on financial instruments, net	(9)	(1)	10	5
Gain (loss) on dispositions, net			(18)
Other, net	$ (1)		2	(1)
Total		$ 25	$ (2)	$ 31