Document and Entity Information	12 Months Ended
	Dec. 31, 2018
Document And Entity Information [Abstract]
Trading Symbol	WES
Entity Registrant Name	Western Midstream Partners, LP
Entity Central Index Key	0001423902
Document Type	8-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Emerging Growth Company	false