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Investments (Schedule Of Impaired Mortgage Loans) (Details) $ in Millions | Sep. 30, 2018 USD ($) item | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) item | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Information about impaired mortgage loans on real estate |  |  |  |  |  |
Number of impaired mortgage loans on real estate | item | 1 |  | 3 |  |  |
Principal balance of impaired mortgage loans on real estate | $ 4 |  | $ 11 |  |  |
Valuation allowance associated with impaired mortgage loans on real estate | (1) | $ (2) | (3) | $ (2) | $ (2) | $ (2)
Carrying value of impaired mortgage loans on real estate | $ 3 |  | $ 8 |  |  |

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- Definition Carrying value of impaired mortgage loans on real estate. + References No definition available. + Details
Name: | lnc_CarryingValueOfImpairedMortgageLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Principal balance of impaired mortgage loans on real estate as of the balance sheet date. + References No definition available. + Details
Name: | lnc_ImpairedMortgageLoansOnRealEstatePrincipalBalance
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Total number of impaired mortgage loans on real estate as of the balance sheet date. + References No definition available. + Details
Name: | lnc_NumberOfImpairedMortgageLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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Balance Type: | credit
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