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v3.19.1

Shares and Stockholders' Equity (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Shares and Stockholders' Equity [Abstract] |
Deferred compensation plan mark to market adjustment | $ 2

X
- 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

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