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Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 783	$ 820	$ 1,822	$ 1,964
Weighted average common shares outstanding	342,170	348,615	342,513	349,726
Effect of dilutive incremental shares	6,203	6,424	6,821	7,662
Shares used for diluted earnings per share	348,373	355,039	349,334	357,388
Basic earnings per share	$ 2.29	$ 2.35	$ 5.32	$ 5.62
Diluted earnings per share	$ 2.25	$ 2.31	$ 5.22	$ 5.50

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