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 LNL)	$ 2,779	$ 1,381
Collateral Posted by LNL (Held by Counter-Party)	(292)	(190)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	615	441
Collateral Posted by LNL (Held by Counter-Party)	(31)	(22)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	1,407	549
Collateral Posted by LNL (Held by Counter-Party)	(261)	(168)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	43	36
Collateral Posted by LNL (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	714	355
Collateral Posted by LNL (Held by Counter-Party)