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Derivative Instruments (Balance Sheet Offsetting) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Assets    
Derivative Fair Value Of Derivative Asset $ 2,587us-gaap_DerivativeFairValueOfDerivativeAsset $ 3,102us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Instruments, Gross amount of recognized assets 2,537lnc_DerivativeInstrumentsGrossAmountsOfRecognizedAssets 1,805lnc_DerivativeInstrumentsGrossAmountsOfRecognizedAssets
Derivative Instruments, Gross amounts offset (677)us-gaap_DerivativeAssetFairValueGrossLiability (924)us-gaap_DerivativeAssetFairValueGrossLiability
Derivative Instruments, Net amount of assets 1,860us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 881us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative Instruments, Cash collateral (1,534)us-gaap_DerivativeCollateralObligationToReturnCash (623)us-gaap_DerivativeCollateralObligationToReturnCash
Derivative Instruments, Net amount 326us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 258us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Embedded Derivative Instruments, Gross amount of recognized assets    1,244us-gaap_SecuritiesBorrowedGross
Embedded Derivative Instruments, Gross amounts offset     
Embedded Derivative Instruments, Net amount of assets    1,244us-gaap_SecuritiesBorrowed
Embedded Derivative Instruments, Cash collateral     
Embedded Derivative Instruments, Net amount    1,244us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral
Total, Gross amount of recognized assets 2,537us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross 3,049us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Total, Gross amounts offset (677)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability (924)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Total, Net amount of assets 1,860us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed 2,125us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
Total, Cash collateral (1,534)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash (623)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
Total, Net amount 326us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral 1,502us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
Financial Liabilities    
Derivative Fair Value Of Derivative Liability 2,301us-gaap_DerivativeFairValueOfDerivativeLiability 2,322us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative Instruments, Gross amount of recognized liabilities 130lnc_DerivativeInstrumentsGrossAmountOfRecognizedLiabilities 242lnc_DerivativeInstrumentsGrossAmountOfRecognizedLiabilities
Derivative Instruments, Gross amounts offset (50)us-gaap_DerivativeLiabilityFairValueGrossAsset (55)us-gaap_DerivativeLiabilityFairValueGrossAsset
Derivative Instruments, Net amount of liabilities 80us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 187us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Derivative Instruments, Cash collateral (85)us-gaap_DerivativeCollateralRightToReclaimSecurities  
Derivative Instruments, Net amount (5)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral 187us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Embedded Derivative Instruments, Gross amount of recognized liabilities 1,494us-gaap_SecuritiesLoanedGross 1,156us-gaap_SecuritiesLoanedGross
Embedded Derivative Instruments, Gross amounts offset     
Embedded Derivative Instruments, Net amount of liabilities 1,494us-gaap_SecuritiesLoaned 1,156us-gaap_SecuritiesLoaned
Embedded Derivative Instruments, Cash collateral     
Embedded Derivative Instruments, Net amount 1,494us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral 1,156us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral
Total, Gross amount of recognized liabilities 1,624us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross 1,398us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Total, Gross amounts offset (50)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset (55)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Total, Net amount of liabilities 1,574us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned 1,343us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
Total, Cash collateral (85)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities  
Total, Net amount $ 1,489us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral $ 1,343us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral