Supplemental Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Comprehensive Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jun. 30, 2013
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts	$ 9,958	$ 9,473			$ 19,641	$ 18,667
Provision for doubtful accounts	728	1,023			1,579	1,777
Revenues	9,230	8,450			18,062	16,890
Salaries and benefits	4,098	3,848			8,148	7,765
Supplies	1,532	1,470			3,064	2,949
Other operating expenses	1,644	1,507			3,289	3,030
Electronic health record incentive income	(35)	(52)			(65)	(91)
Equity in earnings of affiliates	(9)	(12)			(18)	(20)
Depreciation and amortization	454	425			901	849
Interest expense	427	462			887	934
Gains on sales of facilities	(11)	(4)			(32)	12
Losses on retirement of debt	226		17		226	17
Legal claim costs				175	78
Management fees
Total expenses including equity in earnings of affiliates	8,326	7,644			16,478	15,445
Income (loss) before income taxes	904	806			1,584	1,445
Provision (benefit) for income taxes	272	269			498	470
Net income (loss)	632	537			1,086	975
Net income attributable to noncontrolling interests	149	114			256	208
Net income (loss) attributable to HCA Holdings, Inc.	483	423			830	767
Comprehensive income (loss) attributable to HCA Holdings, Inc.	516	472			888	798
HCA Holdings, Inc. Issuer [Member]
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts
Provision for doubtful accounts
Revenues
Salaries and benefits
Supplies
Other operating expenses	5	1			10	2
Electronic health record incentive income
Equity in earnings of affiliates	(549)	(504)			(952)	(860)
Depreciation and amortization
Interest expense	46	51			92	97
Gains on sales of facilities
Losses on retirement of debt
Legal claim costs
Management fees
Total expenses including equity in earnings of affiliates	(498)	(452)			(850)	(761)
Income (loss) before income taxes	498	452			850	761
Provision (benefit) for income taxes	(18)	(20)			(38)	(37)
Net income (loss)	516	472			888	798
Net income attributable to noncontrolling interests
Net income (loss) attributable to HCA Holdings, Inc.	516	472			888	798
Comprehensive income (loss) attributable to HCA Holdings, Inc.	516	472			888	798
HCA Inc. Issuer [Member]
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts
Provision for doubtful accounts
Revenues
Salaries and benefits
Supplies
Other operating expenses
Electronic health record incentive income
Equity in earnings of affiliates
Depreciation and amortization
Interest expense	536	544			1,093	1,102
Gains on sales of facilities
Losses on retirement of debt	226				226	17
Legal claim costs					78
Management fees
Total expenses including equity in earnings of affiliates	762	544			1,397	1,119
Income (loss) before income taxes	(762)	(544)			(1,397)	(1,119)
Provision (benefit) for income taxes	(277)	(213)			(524)	(425)
Net income (loss)	(485)	(331)			(873)	(694)
Net income attributable to noncontrolling interests
Net income (loss) attributable to HCA Holdings, Inc.	(485)	(331)			(873)	(694)
Comprehensive income (loss) attributable to HCA Holdings, Inc.	(477)	(283)			(851)	(630)
Subsidiary Guarantors [Member]
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts	5,079	5,012			10,109	9,884
Provision for doubtful accounts	394	608			931	1,051
Revenues	4,685	4,404			9,178	8,833
Salaries and benefits	2,118	2,058			4,217	4,185
Supplies	805	776			1,619	1,567
Other operating expenses	789	757			1,562	1,489
Electronic health record incentive income	(24)	(33)			(46)	(62)
Equity in earnings of affiliates	(1)	(1)			(2)	(2)
Depreciation and amortization	224	211			442	420
Interest expense	(112)	(109)			(234)	(215)
Gains on sales of facilities	(11)	3			(32)	19
Losses on retirement of debt
Legal claim costs
Management fees	(176)	(181)			(350)	(364)
Total expenses including equity in earnings of affiliates	3,612	3,481			7,176	7,037
Income (loss) before income taxes	1,073	923			2,002	1,796
Provision (benefit) for income taxes	381	354			733	671
Net income (loss)	692	569			1,269	1,125
Net income attributable to noncontrolling interests	18	16			47	29
Net income (loss) attributable to HCA Holdings, Inc.	674	553			1,222	1,096
Comprehensive income (loss) attributable to HCA Holdings, Inc.	677	558			1,227	1,105
Subsidiary Non-Guarantors [Member]
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts	4,879	4,461			9,532	8,783
Provision for doubtful accounts	334	415			648	726
Revenues	4,545	4,046			8,884	8,057
Salaries and benefits	1,980	1,790			3,931	3,580
Supplies	727	694			1,445	1,382
Other operating expenses	850	749			1,717	1,539
Electronic health record incentive income	(11)	(19)			(19)	(29)
Equity in earnings of affiliates	(8)	(11)			(16)	(18)
Depreciation and amortization	230	214			459	429
Interest expense	(43)	(24)			(64)	(50)
Gains on sales of facilities		(7)				(7)
Losses on retirement of debt
Legal claim costs
Management fees	176	181			350	364
Total expenses including equity in earnings of affiliates	3,901	3,567			7,803	7,190
Income (loss) before income taxes	644	479			1,081	867
Provision (benefit) for income taxes	186	148			327	261
Net income (loss)	458	331			754	606
Net income attributable to noncontrolling interests	131	98			209	179
Net income (loss) attributable to HCA Holdings, Inc.	327	233			545	427
Comprehensive income (loss) attributable to HCA Holdings, Inc.	349	229			576	385
Eliminations [Member]
Supplemental Condensed Consolidating Financial Information [Line Items]
Revenues before provision for doubtful accounts
Provision for doubtful accounts
Revenues
Salaries and benefits
Supplies
Other operating expenses
Electronic health record incentive income
Equity in earnings of affiliates	549	504			952	860
Depreciation and amortization
Interest expense
Gains on sales of facilities
Losses on retirement of debt
Legal claim costs
Management fees
Total expenses including equity in earnings of affiliates	549	504			952	860
Income (loss) before income taxes	(549)	(504)			(952)	(860)
Provision (benefit) for income taxes
Net income (loss)	(549)	(504)			(952)	(860)
Net income attributable to noncontrolling interests
Net income (loss) attributable to HCA Holdings, Inc.	(549)	(504)			(952)	(860)
Comprehensive income (loss) attributable to HCA Holdings, Inc.	$ (549)	$ (504)			$ (952)	$ (860)