Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	$ 1,387	$ 636
Collateral Posted by LNC (Held by Counter-Party)	(557)	(155)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	441	33
Collateral Posted by LNC (Held by Counter-Party)	(167)	(3)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	555	296
Collateral Posted by LNC (Held by Counter-Party)	(339)	(96)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	36	106
Collateral Posted by LNC (Held by Counter-Party)		(56)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	355	4
Collateral Posted by LNC (Held by Counter-Party)	(51)
BBB+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)		197
Collateral Posted by LNC (Held by Counter-Party)