XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments of Insurance Subsidiaries - Additional Information (Detail) | 6 Months Ended
--- | ---
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Available for sale securities expected maturity of debt securities | 3 years 10 months 24 days
Available for sale securities average scheduled maturity | 5 years 6 months

X
- Definition Available-for-sale securities average scheduled maturity period. + References No definition available. + Details
Name: | hca_AvailableForSaleSecuritiesAverageScheduledMaturityPeriod
Namespace Prefix: | hca_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Available for sale securities expected maturity of debt securities (in years). + References No definition available. + Details
Name: | hca_AvailableForSaleSecuritiesExpectedMaturityPeriodOfDebtSecurities
Namespace Prefix: | hca_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration