Stockholders' Equity (Schedule of Stockholders' Equity) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Equity, beginning balance	$ 4,105
Redeemable Noncontrolling Interests, beginning balance	571
Comprehensive income including portion attributable to nonredeemable noncontrolling interests	(1,427)
Distributions to noncontrolling interests, net of contributions	(10)
Purchase of subsidiary shares from noncontrolling interests	(6)
Noncontrolling interests in acquired entity	32
Adjustment to redemption value of redeemable noncontrolling interests	7
Distribution of Quorum Health Corporation	(703)
Cancellation of restricted stock for tax withholdings on vested shares	(5)
Income tax payable increase from vesting of restricted shares	(17)
Share-based compensation	26
Equity, ending balance	2,002
Redeemable Noncontrolling Interests, ending balance	546
Redeemable Noncontrolling Interests (Non- Equity) [Member]
Redeemable Noncontrolling Interests, beginning balance	571
Comprehensive income attributable to redeemable noncontrolling interest	37
Distributions to redeemable noncontrolling interests, net of contributions	(37)
Purchase of subsidiary shares from noncontrolling interests	(10)
Adjustment to redemption value of redeemable noncontrolling interests	(7)
Distribution of Quorum Health Corporation	(8)
Redeemable Noncontrolling Interests, ending balance	546
Common Stock [Member]
Equity, beginning balance	1
Equity, ending balance	1
Additional Paid-in Capital [Member]
Equity, beginning balance	1,963
Purchase of subsidiary shares from noncontrolling interests	(2)
Adjustment to redemption value of redeemable noncontrolling interests	7
Cancellation of treasury stock	(7)
Cancellation of restricted stock for tax withholdings on vested shares	(5)
Income tax payable increase from vesting of restricted shares	(17)
Share-based compensation	26
Equity, ending balance	1,965
Treasury Stock [Member]
Equity, beginning balance	(7)
Cancellation of treasury stock	7
Equity, ending balance
Accumulated Other Comprehensive Income (Loss) [Member]
Equity, beginning balance	(73)
Comprehensive income including portion attributable to nonredeemable noncontrolling interests	(19)
Distribution of Quorum Health Corporation	2
Equity, ending balance	(90)
Retained Earnings [Member]
Equity, beginning balance	2,135
Comprehensive income including portion attributable to nonredeemable noncontrolling interests	(1,421)
Distribution of Quorum Health Corporation	(695)
Equity, ending balance	19
Noncontrolling Interests [Member]
Equity, beginning balance	86
Comprehensive income including portion attributable to nonredeemable noncontrolling interests	13
Distributions to noncontrolling interests, net of contributions	(10)
Purchase of subsidiary shares from noncontrolling interests	(4)
Noncontrolling interests in acquired entity	32
Distribution of Quorum Health Corporation	(10)
Equity, ending balance	$ 107