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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 1,450	$ 1,079	$ 2,873	$ 1,660
Weighted average common shares outstanding	328,171	337,760	333,119	338,001
Effect of dilutive incremental shares	4,442	3,839	4,821	4,847
Shares used for diluted earnings per share	332,613	341,599	337,940	342,848
Basic earnings per share	$ 4.42	$ 3.20	$ 8.62	$ 4.91
Diluted earnings per share	$ 4.36	$ 3.16	$ 8.50	$ 4.84

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