Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 203us-gaap_ProfitLoss	$ 217us-gaap_ProfitLoss	$ 346us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,187	783	726
Deferred income taxes	107	69	53
Government settlement and related costs	101us-gaap_LossContingencyAccrualProvision	102us-gaap_LossContingencyAccrualProvision
Stock-based compensation expense	54us-gaap_ShareBasedCompensation	38us-gaap_ShareBasedCompensation	41us-gaap_ShareBasedCompensation
Impairment of hospitals sold or held for sale	50	5
Impairment of long-lived assets	41us-gaap_AssetImpairmentCharges	12us-gaap_AssetImpairmentCharges	10us-gaap_AssetImpairmentCharges
Loss from early extinguishment of debt	73	1	115
Excess tax benefit relating to stock-based compensation		(7)	(4)
Other non-cash expenses, net	13us-gaap_OtherNoncashExpense	61us-gaap_OtherNoncashExpense	33us-gaap_OtherNoncashExpense
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Patient accounts receivable	(306)	(285)	(204)
Supplies, prepaid expenses and other current assets	28	(8)	(99)
Accounts payable, accrued liabilities and income taxes	147	76	246
Other	(83)	25	17
Net cash provided by operating activities	1,615	1,089	1,280
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(3,091)	(44)	(322)
Purchases of property and equipment	(853)	(614)	(769)
Proceeds from disposition of hospitals and other ancillary operations	88
Proceeds from sale of property and equipment	50	7	6
Purchases of available-for-sale securities	(263)
Proceeds from sales of available-for-sale securities	229
Increase in other investments	(511)	(340)	(298)
Net cash used in investing activities	(4,351)	(991)	(1,383)
Cash flows from financing activities:
Proceeds from exercise of stock options	65	110	20
Repurchase of restricted stock shares for payroll tax withholding requirements	(11)	(15)	(9)
Payment of special dividend to stockholders			(23)us-gaap_PaymentsOfCapitalDistribution
Stock buy-back	(9)	(27)
Deferred financing costs and other debt-related costs	(276)us-gaap_PaymentsOfFinancingCosts	(13)us-gaap_PaymentsOfFinancingCosts	(141)us-gaap_PaymentsOfFinancingCosts
Excess tax benefit relating to stock-based compensation		7	4
Proceeds from noncontrolling investors in joint ventures	10		1
Redemption of noncontrolling investments in joint ventures	(158)us-gaap_PaymentsToMinorityShareholders	(9)us-gaap_PaymentsToMinorityShareholders	(44)us-gaap_PaymentsToMinorityShareholders
Distributions to noncontrolling investors in joint ventures	(104)	(76)	(68)
Borrowings under credit agreements	9,131	1,194	3,976
Issuance of long-term debt	4,000		3,825
Proceeds from receivables facility	204	338	350
Repayments of long-term indebtedness	(9,980)us-gaap_RepaymentsOfLongTermDebt	(1,622)us-gaap_RepaymentsOfLongTermDebt	(7,530)us-gaap_RepaymentsOfLongTermDebt
Net cash provided by (used in) financing activities	2,872	(113)	361
Net change in cash and cash equivalents	136	(15)	258
Cash and cash equivalents at beginning of period	373	388	130
Cash and cash equivalents at end of period	509	373	388
Supplemental disclosure of cash flow information:
Interest payments	(831)us-gaap_InterestPaidNet	(583)us-gaap_InterestPaidNet	(594)us-gaap_InterestPaidNet
Income tax refunds (payments), net	$ 180us-gaap_IncomeTaxesPaidNet	$ (73)us-gaap_IncomeTaxesPaidNet	$ (56)us-gaap_IncomeTaxesPaidNet

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Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed.

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The cash outflow for loan and debt issuance costs.

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