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Investments, Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments [Member] $ in Millions | Mar. 31, 2021 USD ($)
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Investment Commitments [Abstract] |
Commitments to purchase or fund investments | $ 1,400
Commitments to sell investments | $ 100

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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 Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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