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Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Investments [Abstract] |  |
Collateral payable for derivative investments | $ (2,210) | $ 2,462
Securities pledged under securities lending agreements | (2) | (3)
Securities pledged under repurchase agreements | 418 | 0
Investments pledged for FHLBI | 240 | 550
Total increase (decrease) in payables for collateral on investments | $ (1,554) | $ 3,009

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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 Increase (Decrease) In Cash Collateral For Reverse Repurchase Agreements + References No definition available. + Details
Name: | lnc_IncreaseDecreaseInCashCollateralForReverseRepurchaseAgreements
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

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- 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