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Principal Components of Net Deferred Tax Balances (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Future policy benefits payable $ 320hum_DeferredTaxAssetsFuturePolicyBenefitsPayable $ 303hum_DeferredTaxAssetsFuturePolicyBenefitsPayable
Compensation and other accrued expenses 176us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 185us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Benefits payable 138us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 111us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Net operating loss carryforward 52us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 51us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred acquisition costs 57hum_DeferredTaxAssetsDeferredPolicyAcquisitionCost 46hum_DeferredTaxAssetsDeferredPolicyAcquisitionCost
Unearned premiums 21us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve 10us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve
Other 18us-gaap_DeferredTaxAssetsOther 10us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 782us-gaap_DeferredTaxAssetsGross 716us-gaap_DeferredTaxAssetsGross
Valuation allowance (48)us-gaap_DeferredTaxAssetsValuationAllowance (28)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income tax assets, net of valuation allowance 734us-gaap_DeferredTaxAssetsNet 688us-gaap_DeferredTaxAssetsNet
Depreciable property and intangible assets (410)hum_DeferredTaxLiabilitiesDepreciablePropertyAndIntangibleAssets (453)hum_DeferredTaxLiabilitiesDepreciablePropertyAndIntangibleAssets
Investment securities (168)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome (78)us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Prepaid expenses (55)us-gaap_DeferredTaxLiabilitiesOther (83)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities (633)us-gaap_DeferredTaxLiabilities (614)us-gaap_DeferredTaxLiabilities
Total net deferred income tax assets (liabilities) 101us-gaap_DeferredTaxAssetsLiabilitiesNet 74us-gaap_DeferredTaxAssetsLiabilitiesNet
Other current assets 87us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 60us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other long-term assets 14us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 14us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Trade accounts payable and accrued expenses 0us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Total net deferred income tax assets (liabilities) $ 101us-gaap_DeferredTaxAssetsLiabilitiesNet $ 74us-gaap_DeferredTaxAssetsLiabilitiesNet