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Reporting Entity - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Entity Information [Line Items]  
Percentage of premiums and services revenues derived from contracts with Federal Government 73.00%hum_PercentageOfPremiumsAndServicesRevenuesDerivedFromContractsWithFederalGovernment
FLORIDA  
Entity Information [Line Items]  
Percentage of premiums and services revenue related to contracts with CMS for Medicare Advantage members in Florida 15.00%hum_PercentageOfPremiumsAndServicesRevenueRelatedToContractsForMedicareAdvantage
/ us-gaap_StatementGeographicalAxis
= stpr_FL