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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to HCA Healthcare, Inc. $ 1,643 $ 1,270 $ 4,906 $ 4,322
Weighted average common shares outstanding 232,891 256,763 239,615 260,770
Effect of dilutive incremental shares 3,290 3,154 2,844 3,217
Shares used for diluted earnings per share 236,181 259,917 242,459 263,987
Basic earnings $ 7.05 $ 4.94 $ 20.47 $ 16.57
Diluted earnings $ 6.96 $ 4.88 $ 20.23 $ 16.37