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Shares and Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020
Shares and Stockholders' Equity [Abstract] |  |  |
Deferred compensation plan mark to market adjustment | $ 5 | $ 3 | $ 16

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- Definition Mark to market adjustments of the entity's stock associated with non-employee directors' deferred compensation plans. + References No definition available. + Details
Name: | lnc_DeferredCompensationPlanMarkToMarketAdjustment
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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