Consolidated Income Statements (USD $) In Millions, except Share data in Thousands, unless otherwise specified	0 Months Ended		3 Months Ended									12 Months Ended
	Nov. 30, 2014	Apr. 30, 2014	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues before the provision for doubtful accounts												$ 40,087	$ 38,040	$ 36,783
Provision for doubtful accounts												3,169	3,858	3,770
Revenues			9,636	9,220	9,230	8,832	8,836	8,456	8,450	8,440		36,918	34,182	33,013
Salaries and benefits												16,641	15,646	15,089
Supplies												6,262	5,970	5,717
Other operating expenses												6,755	6,237	6,048
Electronic health record incentive income												(125)	(216)	(336)
Equity in earnings of affiliates												(43)	(29)	(36)
Depreciation and amortization												1,820	1,753	1,679
Interest expense												1,743	1,848	1,798
Losses (gains) on sales of facilities			(7)	(9)	(7)	(13)	(2)	1	(3)	11		(29)	10	(15)
Losses on retirement of debt	109	226	(68)		143	(49)				17		335	17
Legal claim costs						78				(11)	175	78		175
Total expenses including equity in earnings of affiliates												33,437	31,236	30,119
Income before income taxes												3,481	2,946	2,894
Provision for income taxes												1,108	950	888
Net income			676	611	632	454	554	467	537	438		2,373	1,996	2,006
Net income attributable to noncontrolling interests												498	440	401
Net income attributable to HCA Holdings, Inc.			$ 527	$ 518	$ 483	$ 347	$ 424	$ 365	$ 423	$ 344		$ 1,875	$ 1,556	$ 1,605
Per share data:
Basic earnings per share			$ 1.22	$ 1.20	$ 1.10	$ 0.78	$ 0.96	$ 0.82	$ 0.95	$ 0.77		$ 4.30	$ 3.50	$ 3.65
Diluted earnings per share			$ 1.19	$ 1.16	$ 1.07	$ 0.76	$ 0.92	$ 0.79	$ 0.91	$ 0.74		$ 4.16	$ 3.37	$ 3.49
Shares used in earnings per share calculations (in thousands):
Basic												435,668	445,066	440,178
Diluted												450,352	461,913	459,403