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Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions | 9 Months Ended
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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

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- Definition The net change during the reporting period in the amount of cash that is received related to collateral payable held for derivative instruments. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCashCollateralForDerivativeInvestments
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The net change during the reporting period in the amount of cash that is received related to securities pledged under securities lending agreements. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCashCollateralForSecuritiesLendingAgreements
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCashCollateralForSecuritiesPledgedForFHLBI
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the amount that is received as security when loaning securities. + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCollateralForLoanedSecurities
Namespace Prefix: | lnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration