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Commitments and Contingencies - Additional Information (Detail) - CNA Financial [Member] $ in Millions	Mar. 31, 2019 USD ($)
Commitments [Line Items]
Aggregate amount related to indemnification agreements	$ 252
Aggregate amount related to quantifiable guarantees	375
Potential amount of future payments under guarantees	$ 1,700

X

- Definition

Aggregate amount of quantifiable guarantee agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	l_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Aggregate amount of quantifiable indemnification agreements.

+ References

No definition available.

+ Details

Name:	l_AggregateAmountOfQuantifiableIndemnificationAgreements
Namespace Prefix:	l_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments [Line Items]

+ References

No definition available.

+ Details

Name:	l_CommitmentsLineItems
Namespace Prefix:	l_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=l_CnaFinancialCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: