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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income attributable to HCA Healthcare, Inc. $ 1,144 $ 659
Weighted average common shares outstanding 350,850 370,289
Effect of dilutive incremental shares 8,899 9,691
Shares used for diluted earnings per share 359,749 379,980
Basic earnings per share $ 3.26 $ 1.78
Diluted earnings per share $ 3.18 $ 1.74