Derivative Instruments (Schedule Of Collateral Amounts With Rights To Reclaim Or Obligation To Return Cash) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	$ 4,391	$ 2,976
Collateral Posted by LNC (Held by Counter-Party)	(747)	(1,061)
AA- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	1,881	1,233
Collateral Posted by LNC (Held by Counter-Party)	(274)	(371)
A+ [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	1,996	1,119
Collateral Posted by LNC (Held by Counter-Party)	(298)	(445)
A [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	69	53
Collateral Posted by LNC (Held by Counter-Party)
A- [Member]
Credit Derivatives [Line Items]
Collateral Posted by Counter-Party (Held by LNC)	445	571
Collateral Posted by LNC (Held by Counter-Party)	$ (175)	$ (245)