Cover Page - shares	9 Months Ended
	Sep. 30, 2025	Nov. 03, 2025
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	1610 West End Avenue
Entity Address, Address Line Two	Suite 200
City Area Code	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37203
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/A
Document Period End Date	Sep. 30, 2025
Entity File Number	1-7107
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Amendment Flag	true
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		69,643,461
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
Amendment Description	This Amendment No. 1 on Form 10-Q/A (this “Amendment”) amends the Quarterly Report on Form 10-Q for the quarter ended September 30, 2025 originally filed by Louisiana-Pacific Corporation, a Delaware corporation (“we,” “our,” “us” or the “Company”), with the Securities and Exchange Commission (“SEC”) on November 5, 2025 (the “Original Filing”). We are filing this Amendment solely to (a) amend Item 5 of Part II of the Original Filing to include information concerning a Rule 10b5-1 trading arrangement adopted by our Chief Executive Officer on August 27, 2025 that was inadvertently omitted from the Original Filing and (b) amend Item 6 of Part II of the Original Filing to include (i) new certifications of our Chief Executive Officer and Chief Financial Officer, as Exhibits 31.1 and 31.2, pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. We are not furnishing new certifications under Section 906 of the Sarbanes-Oxley Act of 2002 because no financial statements are being filed with this Amendment. The complete text of Item 5 of Part II has been set forth in its entirety in accordance with Rule 12b-15 under the Exchange Act.Other than as expressly set forth herein, this Amendment does not, and does not purport to, amend, update or restate the information in Original Filing or reflect any events that have occurred after the Original Filing was made. Information not affected by this Amendment remains unchanged and reflects the disclosures made at the time as of which the Original Filing was made. No changes have been made to the financial statements of the Company as contained in the Original Filing. Accordingly, this Amendment should be read together with the Original Filing and the Company’s other filings with the SEC.