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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Valuation Allowance [Line Items]          
Gross deferred federal, state and local tax expense (benefit) $ 7.3 $ 81.0 $ 52.8 $ 35.0  
Increase (decrease) in valuation allowance 6.7 $ 71.8 50.7 26.5  
Deferred federal, state and local tax benefit       69.3  
Valuation allowance $ 418.7   $ 418.7   $ 368.0
Current Operating Loss          
Valuation Allowance [Line Items]          
Increase (decrease) in valuation allowance       68.6  
HCA Healthcare, Inc. | Health Care Services | Securities Purchase Agreement          
Valuation Allowance [Line Items]          
Gross deferred federal, state and local tax expense (benefit)       104.3  
Increase (decrease) in valuation allowance       $ 95.2