Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	$ 7,156	$ 5,229
Collateral Posted by LNC (Held by Counter- Party)	(8)	(188)
AA-
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	2,604	2,378
Collateral Posted by LNC (Held by Counter- Party)	(7)	(63)
A+
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	3,791	2,496
Collateral Posted by LNC (Held by Counter- Party)	(1)	(125)
A
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	70	82
Collateral Posted by LNC (Held by Counter- Party)	0	0
A-
Credit Derivatives [Line Items]
Collateral Posted by Counter- Party (Held by LNC)	691	273
Collateral Posted by LNC (Held by Counter- Party)	$ 0	$ 0