XML 72 R61.htm IDEA: XBRL DOCUMENT v3.23.2

Claim and Claim Adjustment Expense Reserves - Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	$ 18	$ 27	$ 31	$ 15
Medical professional liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development		1	9	9
Other professional liability and management liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(1)	13	(1)	13
Surety
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(7)	(19)	(7)	(28)
Commercial auto
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	11	21	11	21
General liability
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	70	41	70	41
Workers’ compensation
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	(96)	(82)	(98)	(84)
Property and other
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	6	(12)	12	(21)
Other insurance operations
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	35	64	35	64
Other insurance operations | CNA Financial
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	35	64	35	64
Commercial Property and Casualty Operations | CNA Financial
Net Prior Year Development [Abstract]
Total pretax (favorable) unfavorable development	$ (17)	$ (37)	$ (4)	$ (49)

X

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceLossReservesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-3

+ Details

Name:	us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=l_MedicalProfessionalLiabilityInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=l_OtherProfessionalLiabilityAndManagementLiabilityInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_SuretySegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_GeneralLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_WorkersCompensationInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=l_PropertyAndOtherInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=l_OtherInsuranceOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=l_CnaFinancialCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=l_CommercialPropertyAndCasualtyOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: