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Shares and Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Shares and Stockholders' Equity [Abstract] |  |  |  |
Deferred compensation plan mark to market adjustment | $ 8 | $ (1) | $ 10 | $ (1)

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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