Investments (Schedule Of Increase (Decrease) In Payables For Collateral On Investments) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Increase (decrease) in payables for collateral on investments
Collateral payable for derivative investments	$ 1,973	$ 1,786
Securities pledged under securities lending agreements	184	17
Investments pledged for FHLBI		(450)
Total increase (decrease) in payables for collateral on investments	$ 2,157	$ 1,353

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