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Federal Income Taxes (Significant Components Of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets    
Future contract benefits and other contract holder funds $ 1,167us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther $ 1,225us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Deferred gain on business sold through reinsurance 15us-gaap_DeferredTaxAssetsDeferredIncome 87us-gaap_DeferredTaxAssetsDeferredIncome
Reinsurance related embedded derivative asset 52lnc_DeferredTaxAssetsReinsuranceRelatedDerivative 36lnc_DeferredTaxAssetsReinsuranceRelatedDerivative
Investments 138us-gaap_DeferredTaxAssetsInvestments 85us-gaap_DeferredTaxAssetsInvestments
Compensation and benefit plans 321us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 319us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Net operating loss 17us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 27us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Deferred tax asssets tax credits   201us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred tax assets VIEs 1lnc_DeferredTaxAssetsVies 4lnc_DeferredTaxAssetsVies
Other 142us-gaap_DeferredTaxAssetsOther 79us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,853us-gaap_DeferredTaxAssetsGross 2,063us-gaap_DeferredTaxAssetsGross
Deferred Tax Liabilities    
DAC 1,605lnc_DeferredTaxLiabilitiesDeferredAcquisitionCosts 1,914lnc_DeferredTaxLiabilitiesDeferredAcquisitionCosts
VOBA 219lnc_DeferredTaxLiabilitiesValueOfBusinessAcquired 409lnc_DeferredTaxLiabilitiesValueOfBusinessAcquired
Net unrealized gain on AFS securities 2,684us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome 1,319us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome
Net unrealized gain on trading securities 105us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities 89us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Intangibles 151us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 146us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other 113us-gaap_DeferredTaxLiabilitiesOther 152us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 4,877us-gaap_DeferredTaxLiabilities 4,029us-gaap_DeferredTaxLiabilities
Net deferred tax asset (liability) $ (3,024)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (1,966)us-gaap_DeferredTaxAssetsLiabilitiesNet