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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to HCA Healthcare, Inc. $ 1,653 $ 1,461 $ 3,263 $ 3,052
Weighted average common shares outstanding 239,173 261,156 243,033 262,795
Effect of dilutive incremental shares 2,738 2,915 2,621 3,249
Shares used for diluted earnings per share 241,911 264,071 245,654 266,044
Basic earnings $ 6.91 $ 5.6 $ 13.43 $ 11.61
Diluted earnings $ 6.83 $ 5.53 $ 13.28 $ 11.47