Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 22, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	WEYERHAEUSER COMPANY
Trading Symbol	WY
Entity Central Index Key	0000106535
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		744,929,499
Entity Shell Company	false
Entity File Number	1-4825
Entity Tax Identification Number	910470860
Entity Address, Address Line One	220 Occidental Avenue South
Entity Address, City or Town	Seattle
Entity Address, State or Province	Washington
Entity Address, Postal Zip Code	98104-7800
City Area Code	(206)
Local Phone Number	539-3000