Partnership Distributions - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Distribution Made to Limited Partner [Line Items]
Partnership agreement day requirement of distribution of available cash	55 days
Common units outstanding	443,971,409	443,971,409
WES Operating [Member] | Anadarko [Member] | Common Units [Member]
Distribution Made to Limited Partner [Line Items]
Common units outstanding			6,400,000
WES [Member] | Occidental [Member]
Distribution Made to Limited Partner [Line Items]
Distribution sharing percentage	2.00%
Common units outstanding	242,136,976
WES [Member] | Occidental [Member] | Common Units [Member]
Distribution Made to Limited Partner [Line Items]
Common units outstanding		9,060,641