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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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 1,039	$ 1,144
Weighted average common shares outstanding	342,876	350,850
Effect of dilutive incremental shares	7,440	8,899
Shares used for diluted earnings per share	350,316	359,749
Basic earnings per share	$ 3.03	$ 3.26
Diluted earnings per share	$ 2.97	$ 3.18

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