Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	$ 2,976	$ 1,387
Collateral Posted by LNC (Held by Counter-Party)	(1,061)	(557)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	1,233	441
Collateral Posted by LNC (Held by Counter-Party)	(371)	(167)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	1,119	555
Collateral Posted by LNC (Held by Counter-Party)	(445)	(339)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	53	36
Collateral Posted by LNC (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	571	355
Collateral Posted by LNC (Held by Counter-Party)	$ (245)	$ (51)