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

X

- 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

X

- Details

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