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Derivative Instruments (Balance Sheet Offsetting) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financial Assets    
Derivative Instruments, Gross amount of recognized assets $ 2,966lnc_DerivativeInstrumentsGrossAmountsOfRecognizedAssets $ 2,537lnc_DerivativeInstrumentsGrossAmountsOfRecognizedAssets
Derivative Instruments, Gross amounts offset (871)us-gaap_DerivativeAssetFairValueGrossLiability (677)us-gaap_DerivativeAssetFairValueGrossLiability
Derivative Instruments, Net amount of assets 2,095us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 1,860us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative Instruments, Cash collateral (2,051)us-gaap_DerivativeCollateralObligationToReturnCash (1,534)us-gaap_DerivativeCollateralObligationToReturnCash
Derivative Instruments, Net amount 44us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 326us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Embedded Derivative Instruments, Gross amount of recognized assets     
Embedded Derivative Instruments, Gross amounts offset     
Embedded Derivative Instruments, Net amount of assets     
Embedded Derivative Instruments, Cash collateral     
Embedded Derivative Instruments, Net amount     
Total, Gross amount of recognized assets 2,966us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross 2,537us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Total, Gross amounts offset (871)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability (677)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Total, Net amount of assets 2,095us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed 1,860us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
Total, Cash collateral (2,051)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash (1,534)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
Total, Net amount 44us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral 326us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
Financial Liabilities    
Derivative Instruments, Gross amount of recognized liabilities 182lnc_DerivativeInstrumentsGrossAmountOfRecognizedLiabilities 130lnc_DerivativeInstrumentsGrossAmountOfRecognizedLiabilities
Derivative Instruments, Gross amounts offset (87)us-gaap_DerivativeLiabilityFairValueGrossAsset (50)us-gaap_DerivativeLiabilityFairValueGrossAsset
Derivative Instruments, Net amount of liabilities 95us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 80us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Derivative Instruments, Cash collateral (173)us-gaap_DerivativeCollateralRightToReclaimSecurities (85)us-gaap_DerivativeCollateralRightToReclaimSecurities
Derivative Instruments, Net amount (78)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral (5)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Embedded Derivative Instruments, Gross amount of recognized liabilities 1,897us-gaap_SecuritiesLoanedGross 1,494us-gaap_SecuritiesLoanedGross
Embedded Derivative Instruments, Gross amounts offset     
Embedded Derivative Instruments, Net amount of liabilities 1,897us-gaap_SecuritiesLoaned 1,494us-gaap_SecuritiesLoaned
Embedded Derivative Instruments, Cash collateral     
Embedded Derivative Instruments, Net amount 1,897us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral 1,494us-gaap_SecuritiesLoanedAmountOffsetAgainstCollateral
Total, Gross amount of recognized liabilities 2,079us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross 1,624us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Total, Gross amounts offset (87)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset (50)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Total, Net amount of liabilities 1,992us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned 1,574us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
Total, Cash collateral (173)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities (85)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Total, Net amount $ 1,819us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral $ 1,489us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral