Consolidated Statements of Stockholders' (Deficit) Equity - USD ($) $ in Millions	Redeemable Noncontrolling Interests [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Noncontrolling Interest [Member]	Total
Equity, beginning balance at Dec. 31, 2015		$ 1	$ 1,963	$ (7)	$ (73)	$ 2,135	$ 86	$ 4,105
Redeemable Noncontrolling Interests, beginning balance at Dec. 31, 2015	$ 571
Shares, outstanding, beginning balance at Dec. 31, 2015		113,732,933		(975,549)
Comprehensive income (loss)					9	(1,721)	24	(1,688)
Comprehensive income (loss) attributable to redeemable noncontrolling interest	71
Distributions to noncontrolling interests							(23)	(23)
Distributions to redeemable noncontrolling interests	(69)
Purchase of subsidiary shares from noncontrolling interests	(14)		(9)				4	(5)
Disposition of less-than-wholly owned hospital	(3)
Noncontrolling interests in acquired entity							33	33
Adjustment to redemption value of redeemable noncontrolling interests			(6)					(6)
Adjustment to redemption value of redeemable noncontrolling interests	6
Distribution of Quorum Health Corporation	(8)				2	(713)	(11)	(722)
Cancellation of treasury stock			(7)	$ 7
Cancellation of treasury stock, shares		(975,549)		(975,549)
Cancellation of restricted stock for tax withholdings on vested shares			(6)					(6)
Cancellation of restricted stock for tax withholdings on vested shares, shares		(368,945)
Income tax payable increase from vesting of restricted shares			(6)					(6)
Share-based compensation			46					46
Stock-based compensation, shares		1,488,141
Equity, ending balance at Dec. 31, 2016		$ 1	1,975		(62)	(299)	113	1,728
Redeemable Noncontrolling Interests, ending balance at Dec. 31, 2016	554
Shares, outstanding, ending balance at Dec. 31, 2016		113,876,580
Comprehensive income (loss)					41	(2,459)	25	(2,393)
Comprehensive income (loss) attributable to redeemable noncontrolling interest	38
Contributions from noncontrolling interests							5	5
Distributions to noncontrolling interests							(29)	(29)
Distributions to redeemable noncontrolling interests	(71)
Purchase of subsidiary shares from noncontrolling interests	(4)		(2)					(2)
Disposition of less-than-wholly owned hospital							(10)	(10)
Disposition of less-than-wholly owned hospital	2
Noncontrolling interests in acquired entity	1
Other reclassifications of noncontrolling interests							(29)	(29)
Other reclassifications of redeemable noncontrolling interests	29
Adjustment to redemption value of redeemable noncontrolling interests			22					22
Adjustment to redemption value of redeemable noncontrolling interests	(22)
Distribution of Quorum Health Corporation						(3)		(3)
Cancellation of restricted stock for tax withholdings on vested shares			(5)					(5)
Cancellation of restricted stock for tax withholdings on vested shares, shares		(560,098)
Share-based compensation			24					24
Stock-based compensation, shares		1,334,522
Equity, ending balance at Dec. 31, 2017		$ 1	2,014		(21)	(2,761)	75	(692)
Redeemable Noncontrolling Interests, ending balance at Dec. 31, 2017	527							527
Shares, outstanding, ending balance at Dec. 31, 2017		114,651,004
Comprehensive income (loss)					17	(788)	30	(741)
Comprehensive income (loss) attributable to redeemable noncontrolling interest	54
Adoption of new accounting standards					(6)	6
Contributions from noncontrolling interests	3
Distributions to noncontrolling interests							(28)	(28)
Distributions to redeemable noncontrolling interests	(68)
Purchase of subsidiary shares from noncontrolling interests	(24)		(4)				(3)	(7)
Noncontrolling interests in acquired entity	6
Other reclassifications of noncontrolling interests							(2)	(2)
Other reclassifications of redeemable noncontrolling interests	1
Adjustment to redemption value of redeemable noncontrolling interests			(5)					(5)
Adjustment to redemption value of redeemable noncontrolling interests	5
Cancellation of restricted stock for tax withholdings on vested shares			(1)					(1)
Cancellation of restricted stock for tax withholdings on vested shares, shares		(293,735)
Income tax payable increase from vesting of restricted shares, shares		333
Share-based compensation			13					13
Stock-based compensation, shares		1,890,774
Equity, ending balance at Dec. 31, 2018		$ 1	$ 2,017		$ (10)	$ (3,543)	$ 72	(1,463)
Redeemable Noncontrolling Interests, ending balance at Dec. 31, 2018	$ 504							$ 504
Shares, outstanding, ending balance at Dec. 31, 2018		116,248,376