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Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Information about impaired mortgage loans on real estate |  |  |
Average carrying value for impaired mortgage loans on real estate | $ 6 | $ 7 | $ 17
Interest income recognized on impaired mortgage loans on real estate |  |  | 1
Interest income collected on impaired mortgage loans on real estate |  |  | $ 1

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

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- 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