Equity and Partners' Capital - WES Operating Interests Table (Details) - WES Operating [Member] - shares			3 Months Ended
		Feb. 28, 2019	Mar. 31, 2019
Change In Units [Roll Forward]
Balance			169,565,018
Units issued			308,723
Conversion of Class C units	[1]		0
IDR and General partner unit conversion	[1]		103,041,636
Balance			318,675,578
Anadarko Midstream Assets [Member]
Change In Units [Roll Forward]
Units issued	[1]		45,760,201
Common Units [Member]
Change In Units [Roll Forward]
Balance			152,609,285
Conversion of Class C units		105,624,704	14,681,388	[1]
IDR and General partner unit conversion	[1]		105,624,704
Balance			318,675,578
Common Units [Member] | Anadarko Midstream Assets [Member]
Change In Units [Roll Forward]
Units issued		45,760,201	45,760,201	[1]
Class C Units [Member]
Change In Units [Roll Forward]
Balance			14,372,665
Units issued			308,723
Conversion of Class C units	[1]		(14,681,388)
Balance			0
General Partner [Member]
Change In Units [Roll Forward]
Balance			2,583,068
IDR and General partner unit conversion	[1]		(2,583,068)
Balance			0

[1] See Note 1 for further details on the units issued and converted in connection with the closing of the Merger.