Condensed Consolidated Statements of Equity - USD ($) $ in Millions		Total		Additional Paid-in Capital	Accumulated Deficit		Accumulated Other Comprehensive Loss	Equity Attributable to Common Stock		Equity Attributable to Noncontrolling Interests
Beginning balance at Dec. 31, 2018		$ (247)		$ 4,987	$ (5,342)		$ (6)	$ (361)		$ 114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		37			39			39		(2)
Contributions from noncontrolling interest holders, net		49								49
Distributions to noncontrolling interest holders		(61)								(61)
Other comprehensive income		1					1	1
Warrant		2		2				2
Share-based compensation, net		11		11				11
Ending balance at Sep. 30, 2019		(208)		5,000	(5,303)		(5)	(308)		100
Beginning balance at Jun. 30, 2019		(279)		4,994	(5,397)		(5)	(408)		129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		97			94			94		3
Distributions to noncontrolling interest holders		(32)								(32)
Warrant		2		2				2
Share-based compensation, net		4		4				4
Ending balance at Sep. 30, 2019		(208)		5,000	(5,303)		(5)	(308)		100
Beginning balance at Dec. 31, 2019	[1]	(296)		5,004	(5,370)		(23)	(389)		93
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(2,084)	[1]		(2,096)	[1]		(2,096)	[1]	12
Contributions from noncontrolling interest holders, net										0
Distributions to noncontrolling interest holders	[1]	(37)								(37)
Share-based compensation, net		6		6				6
Return from noncontrolling interest holders		138		138				138
Ending balance at Sep. 30, 2020	[1]	(2,273)		5,148	(7,466)		(23)	(2,341)		68
Beginning balance at Jun. 30, 2020	[1]	(2,376)		5,008	(7,437)		(23)	(2,452)		76
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(32)	[1]		(29)	[1]		(29)	[1]	(3)
Distributions to noncontrolling interest holders	[1]	(5)								(5)
Share-based compensation, net	[1]	2		2				2
Return from noncontrolling interest holders		138		138				138
Ending balance at Sep. 30, 2020	[1]	$ (2,273)		$ 5,148	$ (7,466)		$ (23)	$ (2,341)		$ 68

[1] The above tables exclude amounts related to redeemable noncontrolling interests reported in mezzanine equity. See Note 7 Joint Ventures for more information about our noncontrolling interests and a settlement agreement entered into with one of our noncontrolling interest holders in the third quarter of 2020 where the modification of terms was treated as a return from noncontrolling interest holders.