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Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - Commercial [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Information about impaired mortgage loans on real estate |  |
Average carrying value for impaired commercial mortgage loans on real estate |  | $ 8
Interest income recognized on impaired commercial mortgage loans on real estate |  |
Interest income collected on impaired commercial mortgage loans on real estate |  |

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- Definition Average carrying value for impaired loans on real estate. + References No definition available. + Details
Name: | lnc_AverageCarryingValueForImpairedLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | lnc_InformationAboutImpairedMortgageLoansAbstract
Namespace Prefix: | lnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest income collected on impaired mortgage loans on real estate. + References No definition available. + Details
Name: | lnc_InterestIncomeCollectedOnImpairedMortgageLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest income recognized on impaired mortgage loans on real estate. + References No definition available. + Details
Name: | lnc_InterestIncomeRecognizedOnImpairedMortgageLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |