Document and Entity Information	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Nov. 05, 2013
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-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus		2013
Document Fiscal Period Focus		Q3
Amendment Flag		false
Entity Common Stock, Shares Outstanding			141,121,253