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v3.19.3.a.u2

Variable Interest Entities (Consolidated Variable Interest Entity Asset and Liability Information) (Details) $ in Millions | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
--- | --- | ---
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items] |  |
Number of Instruments | item | 1 | 1
Notional Amounts | $ | $ 613 | $ 600
Total Return Swap [Member] |  |
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items] |  |
Number of Instruments | item | 1 | 1
Notional Amounts | $ | $ 613 | $ 600

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

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- Definition Aggregate notional amount of derivative instruments held by the consolidated variable interest entity. + References No definition available. + Details
Name: | lnc_NotionalAmountOfDerivativeInstrumentsHeldByConsolidatedVies
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of derivative instruments held by the consolidated variable interest entity as of the reporting date. + References No definition available. + Details
Name: | lnc_NumberOfDerivativeInstrumentsHeldByConsolidatedVies
Namespace Prefix: | lnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_TotalReturnSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |