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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Entity Information [Line Items]    
Entity Registrant Name LOUISIANA-PACIFIC CORP  
Entity Central Index Key 0000060519  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-K  
Document Period End Date Dec. 31, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus FY  
Amendment Flag false  
Entity Common Stock, Shares Outstanding 141,260,223dei_EntityCommonStockSharesOutstanding  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Public Float   $ 2,070,534,952dei_EntityPublicFloat