Consolidated Statements of Operations - WES Operating - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues and Other
Revenues and other		$ 2,746,174	$ 2,299,658	$ 2,429,614
Equity income, net – affiliates		237,518	195,469	115,141
Operating expenses
Cost of product	[1]	444,247	415,505	953,792
Operation and maintenance	[1]	641,219	480,861	345,617
General and administrative	[1]	114,591	67,195	53,949
Property and other taxes		61,352	51,848	53,147
Depreciation and amortization		483,255	389,164	318,771
Impairments		6,279	230,584	180,051
Total operating expenses		1,750,943	1,635,157	1,905,327
Gain (loss) on divestiture and other, net	[2],[3]	(1,406)	1,312	132,388
Proceeds from business interruption insurance claims		0	0	29,882
Operating income (loss)		1,231,343	861,282	801,698
Interest income – affiliates		16,900	16,900	16,900
Interest expense	[4]	(303,286)	(183,831)	(142,520)
Other income (expense), net	[5]	(123,785)	(4,763)	1,384
Income (loss) before income taxes		821,172	689,588	677,462
Income tax expense (benefit)		13,472	58,934	(59,923)
Net income (loss)		807,700	630,654	737,385
Net income (loss) attributable to noncontrolling interest		110,459	79,083	196,595
Net income (loss) attributable to Western Midstream Operating, LP		697,241	551,571	540,790
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		697,241	551,571	540,790
Pre-acquisition net (income) loss allocated to Anadarko		(29,279)	(182,142)	(164,183)
General partner interest in net (income) loss		(5,637)	0	0
Limited partners' interest in net income (loss)	[6]	(662,325)	(369,429)	(376,607)
Affiliates [Member]
Revenues and Other
Revenues and other		1,607,396	1,353,711	1,539,105
Operating expenses
Cost of product		254,771	168,535	74,560
Operation and maintenance		146,990	115,948	82,249
General and administrative		101,485	49,672	43,221
Total operating expenses		503,246	334,155	200,030
Interest expense		(1,970)	(6,746)	(224)
Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		1,441,875	1,070,066	769,305
Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		7,062	3,339	0
Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		158,459	280,306	753,724
Affiliates [Member] | Other [Member]
Revenues and Other
Revenues and other		0	0	16,076
Third Parties [Member]
Revenues and Other
Revenues and other		1,138,778	945,947	890,509
Operating expenses
Interest expense		(301,316)	(177,085)	(142,296)
Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		946,316	835,662	588,571
Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		63,065	85,446	0
Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		127,929	22,714	297,486
Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		1,468	2,125	4,452
WES Operating [Member]
Revenues and Other
Revenues and other		2,746,174	2,299,658	2,429,614
Equity income, net – affiliates		237,518	195,469	115,141
Operating expenses
Cost of product	[7]	444,247	415,505	953,792
Operation and maintenance	[7]	641,219	480,861	345,617
General and administrative	[7]	107,772	63,166	51,077
Property and other taxes		61,352	51,848	53,147
Depreciation and amortization		483,255	389,164	318,771
Impairments		6,279	230,584	180,051
Total operating expenses		1,744,124	1,631,128	1,902,455
Gain (loss) on divestiture and other, net	[8],[9]	(1,406)	1,312	132,388
Proceeds from business interruption insurance claims		0	0	29,882
Operating income (loss)		1,238,162	865,311	804,570
Interest income – affiliates		16,900	16,900	16,900
Interest expense	[10]	(303,041)	(181,796)	(140,291)
Other income (expense), net	[11]	(123,864)	(4,955)	1,299
Income (loss) before income taxes		828,157	695,460	682,478
Income tax expense (benefit)		13,472	58,934	(59,923)
Net income (loss)		814,685	636,526	742,401
Net income (loss) attributable to noncontrolling interest		7,095	8,609	10,735
Net income (loss) attributable to Western Midstream Operating, LP		807,590	627,917	731,666
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		807,590	627,917	731,666
Pre-acquisition net (income) loss allocated to Anadarko		(29,279)	(182,142)	(164,183)
General partner interest in net (income) loss	[12]	0	(346,538)	(303,835)
WES Operating [Member] | Series A Preferred Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)	[12]	0	0	(42,373)
WES Operating [Member] | Common Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)			$ (84,334)	$ (192,066)
Net income (loss) per common unit - basic and diluted	[12]		$ 0.55	$ 1.30
WES Operating [Member] | Common and Class C Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)	[12]	(778,311)	$ (99,237)	$ (221,275)
WES Operating [Member] | Affiliates [Member]
Revenues and Other
Revenues and other		1,607,396	1,353,711	1,539,105
Operating expenses
Cost of product		254,800	168,500	74,600
Operation and maintenance		147,000	115,900	82,200
General and administrative		99,613	48,819	42,411
Interest expense		(2,000)	(6,700)	(200)
WES Operating [Member] | Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		1,441,875	1,070,066	769,305
WES Operating [Member] | Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		7,062	3,339	0
WES Operating [Member] | Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		158,459	280,306	753,724
WES Operating [Member] | Affiliates [Member] | Other [Member]
Revenues and Other
Revenues and other		0	0	16,076
WES Operating [Member] | Third Parties [Member]
Revenues and Other
Revenues and other		1,138,778	945,947	890,509
WES Operating [Member] | Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		946,316	835,662	588,571
WES Operating [Member] | Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		63,065	85,446	0
WES Operating [Member] | Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		127,929	22,714	297,486
WES Operating [Member] | Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		$ 1,468	$ 2,125	$ 4,452

[1] Cost of product includes product purchases from affiliates (as defined in Note 1) of $254.8 million, $168.5 million, and $74.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. Operation and maintenance includes charges from affiliates of $147.0 million, $115.9 million, and $82.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. General and administrative includes charges from affiliates of $101.5 million, $49.7 million, and $43.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 6.

[2] Includes losses related to an incident at the DBM complex for the year ended December 31, 2017. See Note 1.

[3] Includes losses related to an incident at the DBM complex for the year ended December 31, 2017. See Note 1.

[4] Includes affiliate amounts of $(2.0) million, $(6.7) million, and $(0.2) million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 1 and Note 13.

[5] Includes losses associated with the interest-rate swap agreements for the years ended December 31, 2019 and 2018. See Note 13.

[6] See Note 1.

[7] Cost of product includes product purchases from affiliates (as defined in Note 1) of $254.8 million, $168.5 million, and $74.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. Operation and maintenance includes charges from affiliates of $147.0 million, $115.9 million, and $82.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. General and administrative includes charges from affiliates of $99.6 million, $48.8 million, and $42.4 million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 6.

[8] Includes losses related to an incident at the DBM complex for the year ended December 31, 2017. See Note 1.

[9] Includes losses related to an incident at the DBM complex for the year ended December 31, 2017. See Note 1.

[10] Includes affiliate amounts of $(2.0) million, $(6.7) million, and $(0.2) million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 1 and Note 13.

[11] Includes losses associated with the interest-rate swap agreements for the years ended December 31, 2019 and 2018. See Note 13.

[12] See Note 5 for the calculation of net income (loss) per common unit.