Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	$ 3,172	$ 1,381
Collateral Posted by LNL (Held by Counter-Party)	(99)	(190)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	818	441
Collateral Posted by LNL (Held by Counter-Party)	(1)	(22)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	1,648	549
Collateral Posted by LNL (Held by Counter-Party)	(98)	(168)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	45	36
Collateral Posted by LNL (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	661	355
Collateral Posted by LNL (Held by Counter-Party)