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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 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]        
Net income attributable to HCA Healthcare, Inc.   $ 5,643 $ 6,956 $ 3,754
Weighted average common shares outstanding   290,348 323,315 338,274
Effect of dilutive incremental shares   4,318 5,437 5,331
Shares used for diluted earnings per share   294,666 328,752 343,605
Basic earnings per share $ 11.1 $ 19.43 $ 21.52 $ 11.1
Diluted earnings per share   $ 19.15 $ 21.16 $ 10.93