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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 612	$ 759	$ 2,434	$ 2,723
Weighted average common shares outstanding	340,789	345,823	341,932	348,411
Effect of dilutive incremental shares	6,698	7,816	6,780	7,713
Shares used for diluted earnings per share	347,487	353,639	348,712	356,124
Basic earnings per share	$ 1.80	$ 2.20	$ 7.12	$ 7.82
Diluted earnings per share	$ 1.76	$ 2.15	$ 6.98	$ 7.65

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