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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)

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