Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income attributable to HCA Healthcare, Inc.	$ 5,242	$ 5,643	$ 6,956
Weighted average common shares outstanding	272,404	290,348	323,315
Effect of dilutive incremental shares	4,008	4,318	5,437
Shares used for diluted earnings per share	276,412	294,666	328,752
Basic earnings per share	$ 19.25	$ 19.43	$ 21.52
Diluted earnings per share	$ 18.97	$ 19.15	$ 21.16