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Income Taxes - Deferred Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets [Abstract]    
Employee and retiree benefit plans $ 594us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits $ 422us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other insurance and contractholder liabilities 415us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities 407us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities
Policy acquisition expenses 141ci_DeferredTaxAssetsDeferredPolicyAcquisitionCost 142ci_DeferredTaxAssetsDeferredPolicyAcquisitionCost
Other accrued liabilities 204us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 157us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Other 98us-gaap_DeferredTaxAssetsOther 128us-gaap_DeferredTaxAssetsOther
Deferred tax assets before valuation allowance 1,452us-gaap_DeferredTaxAssetsGross 1,256us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (49)us-gaap_DeferredTaxAssetsValuationAllowance (49)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance 1,403us-gaap_DeferredTaxAssetsNet 1,207us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities [Abstract]    
Depreciation and amortization 688us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 700us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Foreign operations, net 120ci_DeferredTaxLiabilitiesForeignOperationsNet 162ci_DeferredTaxLiabilitiesForeignOperationsNet
Unrealized appreciation (depreciation) on investments and foreign currency translation 302ci_DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentsAndUnrealizedCurrencyTransactionGains 253ci_DeferredTaxLiabilitiesUnrealizedGainsOnInvestmentsAndUnrealizedCurrencyTransactionGains
Total deferred tax liabilities 1,110us-gaap_DeferredTaxLiabilities 1,115us-gaap_DeferredTaxLiabilities
Net deferred income tax assets 293us-gaap_DeferredTaxAssetsLiabilitiesNet 92us-gaap_DeferredTaxAssetsLiabilitiesNet
Net operating loss related tax benefits $ 71us-gaap_DeferredTaxAssetsOperatingLossCarryforwards