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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances $ 136us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues $ 169us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
Sales (72)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales (30)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Maturities (87)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetMaturities (129)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetMaturities
Settlements 11us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements 3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Calls (8)lnc_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputInvestmentHoldingsMovementsCalls (42)lnc_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputInvestmentHoldingsMovementsCalls
Total (20)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls (29)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 63us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
145us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Sales (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Maturities   (58)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetMaturities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Settlements (26)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(16)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Calls (7)lnc_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputInvestmentHoldingsMovementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(42)lnc_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputInvestmentHoldingsMovementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Total 29lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
19lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CorporateBondSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
CMBS [Member] | Fixed Maturity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Settlements (2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Calls (1)lnc_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnobservableInputInvestmentHoldingsMovementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
 
Total (3)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(6)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
CLOs [Member] | Fixed Maturity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 47us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
12us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Settlements (2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
(5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Total 45lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
7lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CollateralizedLoanObligationsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Equity AFS Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Sales (24)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_EquitySecuritiesMember
 
Total (24)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_EquitySecuritiesMember
 
Trading Securities [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances   1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_TradingAccountAssetsMember
Settlements (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_TradingAccountAssetsMember
(2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= us-gaap_TradingAccountAssetsMember
Total (1)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_TradingAccountAssetsMember
(1)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_TradingAccountAssetsMember
Derivative Investments [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances 40us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
36us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Sales (47)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
(20)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Maturities (87)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetMaturities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
(71)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetMaturities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Total (94)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
(55)lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeFinancialInstrumentsAssetsMember
Indexed Annuity and IUL Contracts [Member] | Future contract benefits [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]    
Issuances (14)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember
(25)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember
Settlements 42us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember
32us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember
Total $ 28lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember
$ 7lnc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesMaturitiesSettlementsCalls
/ us-gaap_FinancialInstrumentAxis
= lnc_IndexedAnnuityContractsMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= lnc_FutureContractBenefitsMember