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Fair Value , Carrying Amount, Estimated Fair Value and Level of Fair Value Hierarchy of Company's Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Estimate Fair Value [Member] |  |
Assets [Abstract] |  |
Other invested assets, primarily mortgage loans | $ 1,036 | $ 1,025
Liabilities [Abstract] |  |
Short term debt | 882 | 75
Long term debt | 9,141 | 11,510
Carrying Amount [Member] |  |
Assets [Abstract] |  |
Other invested assets, primarily mortgage loans | 1,021 | 994
Liabilities [Abstract] |  |
Short term debt | 2,459 | 75
Long term debt | 9,496 | 11,443
Level 2 [Member] | Estimate Fair Value [Member] |  |
Liabilities [Abstract] |  |
Short term debt | 844 | 9
Long term debt | 8,444 | 10,884
Level 3 [Member] | Estimate Fair Value [Member] |  |
Assets [Abstract] |  |
Other invested assets, primarily mortgage loans | 1,036 | 1,025
Liabilities [Abstract] |  |
Short term debt | 38 | 66
Long term debt | $ 697 | $ 626

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- Definition The fair value amount of other invested assets, primarily mortgage loans whether such amount is presented as a separate caption or as a parenthetical disclosure. + References No definition available. + Details
Name: | l_OtherInvestedAssetsPrimarilyMortgageLoansFairValueDisclosure
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_ShorttermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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Balance Type: |
Period Type: |