XML 41 R31.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | $ (96) | $ 22 | $ (166) | $ 657
Net loss related to the expected novation of a coinsurance agreement | 35 |  |  |
Loss on fixed maturity securities supporting the funds withheld liability | 59 |  |  |
Gain on embedded derivative | 24 |  |  |
Nonredeemable Preferred Stock |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | (2) | (2) | (109) | 15
Fixed maturity securities |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Gross gains | 23 | 50 | 94 | 159
Gross losses | (134) | (28) | (222) | (68)
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | (111) | 22 | (128) | 91
Equity securities |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | (2) | (2) | (111) | 17
Derivative instruments |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | 24 | 2 | 79 | 7
Short term investments and other |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 | (7) |  | (6) | (13)
Altium Packaging |  |  |  |
Investment Gains (Losses) [Abstract] |  |  |  |
Investment gains (losses) recognized due to the change in fair value of non-redeemable preferred stock held as of September 30, 2022 and 2021 |  |  |  | $ 555

X
- Definition Gain (Loss) On Fixed Maturity Securities Related To Funds Withheld Liability + References No definition available. + Details
Name: | l_GainLossOnFixedMaturitySecuritiesRelatedToFundsWithheldLiability
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment Gains, Gross + References No definition available. + Details
Name: | l_InvestmentGainsGross
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment Loss, Gross + References No definition available. + Details
Name: | l_InvestmentLossGross
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net Loss Related To Expected Novation Of Coinsurance Agreement + References No definition available. + Details
Name: | l_NetLossRelatedToExpectedNovationOfCoinsuranceAgreement
Namespace Prefix: | l_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Increase in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI https://asc.fasb.org/subtopic&trid=2229187 + Details
Name: | us-gaap_EmbeddedDerivativeGainOnEmbeddedDerivative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_NonredeemablePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_DerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=l_ShortTermInvestmentsAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=l_AltiumPackagingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |