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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Credit Derivatives [Line Items] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 16 |  |
Cash flow hedge, reclassified to earnings, net | 0 | $ 0 |
Non-performance Risk Adjustment | 0 |  |
Exposure Associated With Collateralization Events | $ 0 |  | $ 0
Indexed Annuity [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative term | 6 years |  |

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- Definition Cash flow hedge, reclassified to earnings, net + 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 Amount of exposure associated with collateral support agreements in certain transactions that require the posting of collateral when net exposures exceed predetermined thresholds. + References No definition available. + Details
Name: | lnc_ExposureAssociatedWithCollateralizationEvents
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Credit, or nonperformance, risk adjustment associated with credit loss in the event of nonperformance by our counterparties on various derivative contracts. + References No definition available. + Details
Name: | lnc_NonPerformanceRiskAdjustment
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeTermOfContract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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