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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | $ 759 | $ 426 | $ 2,723 | $ 1,742
Net cash provided by operating activities |  |  |  | 3,692
HCA Healthcare, Inc. Issuer [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | 759 | 426 | 2,723 | 1,742
Net cash provided by operating activities |  |  |  | 74
HCA Inc. Issuer [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | (708) | (524) | (2,016) | (1,463)
Net cash provided by operating activities |  |  |  | (1,694)
Subsidiary Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | 1,253 | 904 | 4,079 | 2,769
Net cash provided by operating activities |  |  |  | 3,766
Subsidiary Non-Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | 183 | 56 | 607 | 396
Net cash provided by operating activities |  |  |  | 1,546
Eliminations [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. | $ (728) | (436) | $ (2,670) | (1,702)
As Previously Reported [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | 426 |  | 1,742
Net cash provided by operating activities |  |  |  | 3,692
As Previously Reported [Member] | HCA Healthcare, Inc. Issuer [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | 426 |  | 1,742
Net cash provided by operating activities |  |  |  | 74
As Previously Reported [Member] | HCA Inc. Issuer [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | (524) |  | (1,463)
Net cash provided by operating activities |  |  |  | (1,694)
As Previously Reported [Member] | Subsidiary Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | 787 |  | 2,467
Net cash provided by operating activities |  |  |  | 3,342
As Previously Reported [Member] | Subsidiary Non-Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | 173 |  | 698
Net cash provided by operating activities |  |  |  | 1,970
As Previously Reported [Member] | Eliminations [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | (436) |  | (1,702)
Adjustment [Member] | Subsidiary Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | 117 |  | 302
Net cash provided by operating activities |  |  |  | 424
Adjustment [Member] | Subsidiary Non-Guarantors [Member] |  |  |  |
Adjustments or Reclassifications [Line Items] |  |  |  |
Net income attributable to HCA Healthcare, Inc. |  | $ (117) |  | (302)
Net cash provided by operating activities |  |  |  | $ (424)

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