Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2012	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenues before provision for doubtful accounts	$ 10,932	$ 9,958			$ 21,254	$ 19,641
Provision for doubtful accounts	1,035	728			1,681	1,579
Revenues	9,897	9,230			19,573	18,062
Salaries and benefits	4,492	4,098			8,890	8,148
Supplies	1,670	1,532			3,308	3,064
Other operating expenses	1,755	1,644			3,472	3,289
Electronic health record incentive income	(18)	(35)			(37)	(65)
Equity in earnings of affiliates	(10)	(9)			(29)	(18)
Depreciation and amortization	469	454			942	901
Interest expense	425	427			844	887
Losses (gains) on sales of facilities	5	(11)			(4)	(32)
Losses on retirement of debt	125	226			125	226
Legal claim costs			$ 78	$ 175		78
Total expenses including equity in earnings of affiliates	8,913	8,326			17,511	16,478
Income before income taxes	984	904			2,062	1,584
Provision for income taxes	319	272			677	498
Net income	665	632			1,385	1,086
Net income attributable to noncontrolling interests	158	149			287	256
Net income attributable to HCA Holdings, Inc.	$ 507	$ 483			$ 1,098	$ 830
Per share data:
Basic earnings per share	$ 1.22	$ 1.10			$ 2.63	$ 1.88
Diluted earnings per share	$ 1.18	$ 1.07			$ 2.54	$ 1.82
Shares used in earnings per share calculations (in millions):
Basic	416,407	438,833			418,267	440,482
Diluted	429,369	453,009			432,329	455,220