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Supplemental Condensed Consolidating Financial Information and Other Collateral-Related Information - Summary of Restatement Adjustments to Financial Statements (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. $ 1,144 $ 659
Net cash provided by operating activities 1,300 1,280
HCA Healthcare, Inc. Issuer [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. 1,144 659
Net cash provided by operating activities 306 347
HCA Inc. Issuer [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. (642) (463)
Net cash provided by operating activities (733) (750)
Subsidiary Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. 1,542 899
Net cash provided by operating activities 1,211 1,108
Subsidiary Non-Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. 190 172
Net cash provided by operating activities 516 575
Eliminations [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc. $ (1,090) (608)
As Previously Reported [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   659
Net cash provided by operating activities   1,280
As Previously Reported [Member] | HCA Healthcare, Inc. Issuer [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   659
Net cash provided by operating activities   347
As Previously Reported [Member] | HCA Inc. Issuer [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   (463)
Net cash provided by operating activities   (750)
As Previously Reported [Member] | Subsidiary Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   818
Net cash provided by operating activities   983
As Previously Reported [Member] | Subsidiary Non-Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   253
Net cash provided by operating activities   700
As Previously Reported [Member] | Eliminations [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   (608)
Adjustment [Member] | Subsidiary Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   81
Net cash provided by operating activities   125
Adjustment [Member] | Subsidiary Non-Guarantors [Member]    
Adjustments or Reclassifications [Line Items]    
Net income attributable to HCA Healthcare, Inc.   (81)
Net cash provided by operating activities   $ (125)