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Quarterly Financial Data - Schedule of Quarterly Financial Information (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Continuing Operations [Member]  
Quarterly Financial Data [Line Items]  
Impairment of goodwill $ 16us-gaap_GoodwillImpairmentLossNetOfTax
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member]  
Quarterly Financial Data [Line Items]  
Impairment of natural gas and oil properties 52l_ImpairmentOfOilAndGasPropertiesNetOfTax
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Impairment of goodwill 382us-gaap_GoodwillImpairmentLossNetOfTax
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
CNA Financial [Member] | Continuing Operations [Member]  
Quarterly Financial Data [Line Items]  
Deferred gain $ 111l_DeferredRetroactiveReinsuranceGain
/ us-gaap_StatementBusinessSegmentsAxis
= l_CnaFinancialMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember