Investments (Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Commercial [Member]
Information about impaired mortgage loans on real estate
Average carrying value for impaired mortgage loans on real estate	$ 18	$ 21

Average carrying value for impaired loans on real estate.

No definition available.

Name:	lnc_AverageCarryingValueForImpairedLoansOnRealEstate
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration