Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	$ 6,903	$ 5,229
Collateral Posted by LNC (Held by Counter- Party)	(114)	(188)
AA-
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	3,403	2,378
Collateral Posted by LNC (Held by Counter- Party)	(71)	(63)
A+
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	2,929	2,496
Collateral Posted by LNC (Held by Counter- Party)	(43)	(125)
A
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	90	82
Collateral Posted by LNC (Held by Counter- Party)	0	0
A-
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	481	273
Collateral Posted by LNC (Held by Counter- Party)	$ 0	$ 0