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Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Information about impaired mortgage loans on real estate |  |  |  |
Average carrying value for impaired mortgage loans on real estate | $ 5 | $ 5 | $ 6 | $ 5
Interest income recognized on impaired mortgage loans on real estate |  |  |  |
Interest income collected on impaired 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