Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	$ 3,942	$ 1,381
Collateral Posted by LNL (Held by Counter-Party)	(46)	(190)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	521	441
Collateral Posted by LNL (Held by Counter-Party)		(22)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	2,674	549
Collateral Posted by LNL (Held by Counter-Party)	(46)	(168)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	35	36
Collateral Posted by LNL (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	712	355
Collateral Posted by LNL (Held by Counter-Party)
BBB+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)
Collateral Posted by LNL (Held by Counter-Party)