Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Entity Information [Line Items]
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Common Stock, $1 par value
Entity Tax Identification Number	93-0609074
Trading Symbol	LPX
Entity Registrant Name	LOUISIANA-PACIFIC CORPORATION
Entity Address, Address Line One	414 Union Street
Entity Address, Address Line Two	Suite 2000
City Area Code	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37219
City Area Code	(615)
Local Phone Number	986 - 5600
Entity Central Index Key	0000060519
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Period End Date	Jun. 30, 2021
Entity File Number	1-7107
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		95,225,904
Security Exchange Name	NYSE
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes