| Cover | Feb. 25, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2021 |
| Pre-commencement Tender Offer | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-7107 |
| Entity Tax Identification Number | 93-0609074 |
| Entity Address, Address Line One | 414 Union Street, |
| Entity Address, Address Line Two | Suite 2000 |
| Entity Address, City or Town | Nashville |
| Entity Address, State or Province | TN |
| Entity Address, Postal Zip Code | 37219 |
| City Area Code | 615 |
| Local Phone Number | 986 - 5600 |
| Written Communications | false |
| Soliciting Material | false |
| Entity Registrant Name | LOUISIANA-PACIFIC CORPORATION |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, $1 par value |
| Trading Symbol | LPX |
| Security Exchange Name | NYSE |
| Amendment Flag | false |
| Entity Central Index Key | 0000060519 |
