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Investments (Changes In The Valuation Allowance Of Impaired Mortgage Loans On Real Estate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for Losses |  |  |
Balance as of beginning-of-year |  | $ 3 | $ 2
Additions |  |  | 1
Charge-offs, net of recoveries |  | $ (3) |
Balance as of end-of-year | $ 2 |  | $ 3

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- Definition Additions to the valuation allowance relating to 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 N/A + References No definition available. + Details
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Namespace Prefix: | lnc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Charge offs, net of recoveries, of impaired mortgage loans on real estate. + References No definition available. + Details
Name: | lnc_ChargeOffsNetOfRecoveriesOfImpairedMortgageLoansOnRealEstate
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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=118959141&loc=d3e21338-158488 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant