Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	$ 2,779	$ 1,387
Collateral Posted by LNC (Held by Counter-Party)	(1,588)	(557)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	615	441
Collateral Posted by LNC (Held by Counter-Party)	(567)	(167)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	1,407	555
Collateral Posted by LNC (Held by Counter-Party)	(653)	(339)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	43	36
Collateral Posted by LNC (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	714	355
Collateral Posted by LNC (Held by Counter-Party)	$ (368)	$ (51)