Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Net income attributable to HCA Holdings, Inc	$ 424	$ 365	$ 423	$ 344	$ 314	$ 360	$ 391	$ 540	$ 1,556	$ 1,605	$ 2,465
Weighted average common shares outstanding									445,066	440,178	476,609
Effect of dilutive incremental shares									16,847	19,225	19,334
Shares used for diluted earnings per share									461,913	459,403	495,943
Basic earnings per share	$ 0.96	$ 0.82	$ 0.95	$ 0.77	$ 0.71	$ 0.82	$ 0.89	$ 1.23	$ 3.50	$ 3.65	$ 5.17
Diluted earnings per share	$ 0.92	$ 0.79	$ 0.91	$ 0.74	$ 0.68	$ 0.78	$ 0.85	$ 1.18	$ 3.37	$ 3.49	$ 4.97