CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified		Total	Common Stock		Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2013		$ 1,828	$ 1		$ 2,054	$ (37)	$ (209)	$ 19	[1]
Balance (in shares) at Dec. 31, 2013			93	[2]			5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		154				154
Foreign currency translation adjustments		(3)						(3)	[1]
Stock compensation expense, net					31
Exercise of common stock options					2
4 percent Convertible Senior Notes (in shares)	[2],[3]		5
4 percent Convertible Senior Notes	[3]				32
Shares repurchased and retired					(19)
Repurchase of common stock (in shares)			(2)	[2]			2
Repurchase of common stock							(228)
Balance at Jun. 30, 2014		$ 1,797	$ 1		$ 2,100	$ 117	$ (437)	$ 16	[1]
Balance (in shares) at Jun. 30, 2014			96	[2]			7

[1] The Accumulated Other Comprehensive Income (Loss) balance primarily reflects foreign currency translation adjustments.

[2] An aggregate of less than 1 million net shares were issued during the year ended December 31, 2013.

[3] Reflects amortization of the original issue discount on the 4 percent Convertible Senior Notes (an amount equal to the unamortized portion of the original issue discount is reflected as “temporary equity” in our consolidated balance sheet) and the conversion of a portion of the 4 percent Convertible Senior Notes during the six months ended June 30, 2014, net of cash received from the option counterparties to our convertible note hedges upon the conversion. See note 8 to our condensed consolidated financial statements for additional detail.