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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 1,079	$ 783	$ 1,660	$ 1,822
Weighted average common shares outstanding	337,760	342,170	338,001	342,513
Effect of dilutive incremental shares	3,839	6,203	4,847	6,821
Shares used for diluted earnings per share	341,599	348,373	342,848	349,334
Basic earnings	$ 3.20	$ 2.29	$ 4.91	$ 5.32
Diluted earnings	$ 3.16	$ 2.25	$ 4.84	$ 5.22

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