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Derivative Instruments (Collateral Support Agreements) (Details) - Credit Default Swap, Seller [Member] - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019
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Credit risk related contingent features collateral |  |
Maximum potential payout | $ 394 | $ 55
Maximum collateral potentially required to post | $ 394 | $ 55

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- Definition Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative, net of any counterparty thresholds + References No definition available. + Details
Name: | lnc_CreditDerivativeMaximumExposureNetOfCounterpartyThresholds
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
Name: | us-gaap_CreditDerivativeMaximumExposureUndiscounted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditDerivativesByContractTypeAxis=us-gaap_CreditDefaultSwapSellingProtectionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |