Equity and Partners' Capital - WES Operating Interests Table (Details) - WES Operating [Member] - shares		12 Months Ended
	Feb. 28, 2019	Dec. 31, 2019	Dec. 31, 2018
Change In Units [Roll Forward]
Balance		169,565,018	168,429,056
Units issued		308,723	1,128,782
Vesting of Long-Term Incentive Plan Awards			7,180
Conversion of Class C units		0
IDR and General partner unit conversion		103,041,636
Balance		318,675,578	169,565,018
Anadarko Midstream Assets [Member]
Change In Units [Roll Forward]
Units issued		45,760,201
Common Units [Member]
Change In Units [Roll Forward]
Balance		152,609,285	152,602,105
Vesting of Long-Term Incentive Plan Awards			7,180
Conversion of Class C units	105,624,704	14,681,388
IDR and General partner unit conversion		105,624,704
Balance		318,675,578	152,609,285
Common Units [Member] | Anadarko Midstream Assets [Member]
Change In Units [Roll Forward]
Units issued	45,760,201	45,760,201
Class C Units [Member]
Change In Units [Roll Forward]
Balance		14,372,665	13,243,883
Units issued		308,723	1,128,782
Conversion of Class C units		(14,681,388)
Balance		0	14,372,665
General Partner [Member]
Change In Units [Roll Forward]
Balance		2,583,068	2,583,068
IDR and General partner unit conversion		(2,583,068)
Balance		0	2,583,068