Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Investments [Abstract]
Collateral payable for derivative investments	$ 1,935	$ 1,552
Securities pledged under securities lending agreements	(20)	(8)
Investments pledged for FHLBI	550	(210)
Total increase (decrease) in payables for collateral on investments	$ 2,465	$ 1,334

The net change during the reporting period in the amount of cash that is received related to securities pledged for Federal Home Loan Bank of Indianapolis.

No definition available.

Name:	lnc_IncreaseDecreaseInCashCollateralForSecuritiesPledgedForFHLBI
Namespace Prefix:	lnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration