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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions		Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018		$ (1,234)	$ 4	$ 8,510	$ (6,022)	$ (3,632)	$ (94)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		482			482
Other comprehensive (loss) income		(2)					(2)
Share repurchases		(749)		(10)		(739)
Equity-based awards activity, net		(32)		(32)
Issuance of common stock		5		5
Common stock dividends	[1]	(8)			(8)
Ending balance at Mar. 31, 2019		(1,538)	4	8,473	(5,548)	(4,371)	(96)
Beginning balance at Dec. 31, 2019		1,658	4	8,501	(1,616)	(5,039)	(192)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		121			121
Other comprehensive (loss) income		(15)					(15)
Repurchase of partners' equity interest in VIE		18		18
Share repurchases		(150)				(150)
Equity-based awards activity, net		(21)		(21)
Common stock dividends		(75)			(75)
Ending balance at Mar. 31, 2020		$ 1,536	$ 4	$ 8,498	$ (1,570)	$ (5,189)	$ (207)
[1] Dividends per common share was $0.30 for the quarter ended March 31, 2020 and $0.03 for the quarter ended March 31, 2019

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