Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	$ 1,133	$ 616
Collateral Posted by LNL (Held by Counter-Party)	(168)	(66)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	306	33
Collateral Posted by LNL (Held by Counter-Party)	(67)	(4)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	460	296
Collateral Posted by LNL (Held by Counter-Party)	(71)	(26)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	12	106
Collateral Posted by LNL (Held by Counter-Party)	(30)	(36)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	18	4
Collateral Posted by LNL (Held by Counter-Party)
BBB+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNL)	337	177
Collateral Posted by LNL (Held by Counter-Party)