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