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Investments - Investment Commitments (Details) - Investments in Assets Requiring Future Purchase, Sale or Funding Commitments $ in Millions	Jun. 30, 2023 USD ($)
Investment Commitments [Abstract]
Commitments to purchase or fund investments	$ 1,500
Commitments to sell investments	$ 60

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherCommitmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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: