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Investments - Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments $ in Millions | Sep. 30, 2024 USD ($)
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Other Commitments [Line Items] |
Commitments to purchase or fund investments | $ 1,600
Commitments to sell investments | $ 90

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- Definition Minimum amount of other commitment in which the entity has agreed to sell investments related to various third-party limited partnerships, signed and accepted mortgage loan applications and obligations related to privately placed debt securities. + References No definition available. + Details
Name: | l_CommitmentsToSellInvestments
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=l_InvestmentsInAssetsRequiringFuturePurchaseSaleOrFundingCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |