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v3.20.1

Subsequent Event (Details) $ in Billions | Mar. 31, 2020 USD ($)
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Diamond Offshore [Member] |
Subsequent Event [Abstract] |
Carrying value | $ 1.0

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- Definition The carrying value of a less than wholly owned subsidiary of the Company. + References No definition available. + Details
Name: | l_ConsolidationLessThanWhollyOwnedSubsidiaryCarryingValue
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | srt_ConsolidatedEntitiesAxis=l_DiamondOffshoreDrillingIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |