Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2012	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues before provision for doubtful accounts	$ 11,014	$ 9,978			$ 32,268	$ 29,619
Provision for doubtful accounts	1,158	758			2,839	2,337
Revenues	9,856	9,220			29,429	27,282
Salaries and benefits	4,619	4,211			13,509	12,359
Supplies	1,644	1,539			4,952	4,603
Other operating expenses	1,796	1,688			5,268	4,977
Electronic health record incentive income	(9)	(32)			(46)	(97)
Equity in earnings of affiliates	(9)	(14)			(38)	(32)
Depreciation and amortization	482	460			1,424	1,361
Interest expense	411	427			1,255	1,314
Losses (gains) on sales of facilities	2	12			(2)	(20)
Losses on retirement of debt					125	226
Legal claim costs	77		$ 78	$ 175	77	78
Total expenses including equity in earnings of affiliates	9,013	8,291			26,524	24,769
Income before income taxes	843	929			2,905	2,513
Provision for income taxes	270	318			947	816
Net income	573	611			1,958	1,697
Net income attributable to noncontrolling interests	124	93			411	349
Net income attributable to HCA Holdings, Inc.	$ 449	$ 518			$ 1,547	$ 1,348
Per share data:
Basic earnings per share	$ 1.08	$ 1.20			$ 3.71	$ 3.08
Diluted earnings per share	$ 1.05	$ 1.16			$ 3.60	$ 2.98
Shares used in earnings per share calculations (in millions):
Basic	414,939	432,617			417,146	437,832
Diluted	426,441	447,260			430,354	452,538