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Variable Interest Entities (Consolidated Variable Interest Entity Asset and Liability Information) (Details) - Total Return Swap [Member] - Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member] $ in Millions | Sep. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items] |  |
Number of Instruments, Assets | security | 1 | 1
Notional Amounts, Assets | $ | $ 608 | $ 613

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- Definition The number of derivative instruments of a particular derivative asset or group of derivative assets held by the consolidated variable interest entity. + References No definition available. + Details
Name: | lnc_DerivativeAssetNumberOfInstrumentsHeldByConsolidatedVies
Namespace Prefix: | lnc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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 assets held by the consolidated variable interest entity. + References No definition available. + Details
Name: | lnc_ViesDerivativeAssetNotionalAmount
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |