Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Class A Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning Balance at Dec. 31, 2012	$ 857	$ 1	$ 139	$ (642)	$ 1,369	$ (10)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Class A common stock	(63)			(63)
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	23		(11)	34
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(8)			(8)
Additional tax benefit resulting from exercise of options	2		2
Equity based compensation	13		13
Net (loss) income	134				134
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	0
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	0
Foreign currency translation adjustment	1					1
Ending Balance at Dec. 31, 2013	959	1	143	(679)	1,503	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	28		(22)	50
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(5)			(5)
Additional tax benefit resulting from exercise of options	6		6
Equity based compensation	20		20
Net (loss) income	32				32
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	7					7
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	(8)					(8)
Foreign currency translation adjustment	1					1
Ending Balance at Dec. 31, 2014	1,040	1	147	(634)	1,535	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards net of cancellations	17		1	16
Repurchase share in exchange for the payment of taxes related to the net share settlements of equity awards	(13)			(13)
Additional tax benefit resulting from exercise of options	11		11
Equity based compensation	31		31
Net (loss) income	(137)				(137)
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	(6)					(6)
Unrealized loss on forward interest rate swaps hedging transactions (net of income taxes)	(7)					(7)
Foreign currency translation adjustment	(27)					(27)
Issuance of warrants exercisable for 250,000 shares, exercise price $89.34, expiration April 5, 2017	4		4
Ending Balance at Dec. 31, 2015	$ 913	$ 1	$ 194	$ (631)	$ 1,398	$ (49)