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Nature of Operations, Basis of Presentation and Summary of Significant Accounting Policies - Summary of Amortization Basis and Expected Amortization Period by Reportable Segment (Details) | 12 Months Ended
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Dec. 31, 2024
Life Insurance |
Product Information [Line Items] |
Traditional contract acquisition cost amortization period | 60 years
Group Protection |
Product Information [Line Items] |
Traditional contract acquisition cost amortization period | 4 years
Retirement Plan Services |
Product Information [Line Items] |
Traditional contract acquisition cost amortization period | 40 years

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- Definition The amortization period range for acquisition costs associated with all traditional contracts, including traditional life insurance contracts + References No definition available. + Details
Name: | lnc_TraditionalContractAcquisitionCostAmortizationPeriod
Namespace Prefix: | lnc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=lnc_LifeSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=lnc_GroupProtectionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=lnc_RetirementPlanServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |