Consolidated Statements of Operations - WES Operating - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Revenues and Other
Revenues and other		$ 666,027	$ 587,900	[1]	$ 2,022,964	$ 1,607,032	[1]
Equity income, net – affiliates		53,893	54,215	[1]	175,483	133,874	[1]
Operating expenses
Cost of product	[2]	97,800	101,035	[1]	334,740	291,009	[1]
Operation and maintenance	[2]	176,572	129,042	[1]	467,832	338,626	[1]
General and administrative	[2]	30,769	16,022	[1]	83,640	47,448	[1]
Property and other taxes		15,281	13,146	[1]	45,848	41,496	[1]
Depreciation and amortization		127,914	97,479	[1]	362,977	270,757	[1]
Impairments		3,107	27,902	[1]	4,294	155,286	[1]
Total operating expenses		451,443	384,626	[1]	1,299,331	1,144,622	[1]
Gain (loss) on divestiture and other, net		248	65	[1]	(1,403)	351	[1]
Operating income (loss)		268,725	257,554	[1]	897,713	596,635	[1]
Interest income – affiliates		4,225	4,225	[1]	12,675	12,675	[1]
Interest expense	[3]	(78,524)	(48,869)	[1]	(223,872)	(129,129)	[1]
Other income (expense), net		(67,894)	655	[1]	(161,577)	2,749	[1]
Income (loss) before income taxes		126,532	213,565	[1]	524,939	482,930	[1]
Income tax expense (benefit)		1,309	15,005	[1]	12,679	36,193	[1]
Net income (loss)		125,223	198,560	[1]	512,260	446,737	[1]
Net income (loss) attributable to noncontrolling interest		4,006	47,203	[1]	102,789	63,669	[1]
Net income (loss) attributable to Western Midstream Operating, LP		121,217	151,357	[1]	409,471	383,068	[1]
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		121,217	151,357	[1]	409,471	383,068	[1]
Pre-acquisition net (income) loss allocated to Anadarko		0	(43,883)	[1]	(29,279)	(107,009)	[1]
Limited partners' interest in net income (loss)		121,217	107,474	[1]	380,192	276,059	[1]
Affiliates [Member]
Revenues and Other
Revenues and other		398,753	350,291	[1]	1,162,374	925,011	[1]
Operating expenses
Cost of product		61,066	39,702		185,463	112,522
Operation and maintenance		39,459	29,794		110,918	79,621
General and administrative		27,724	12,645		73,510	37,595
Total operating expenses		128,249	82,141		369,891	229,738
Interest expense		(59)	(2,035)		(1,912)	(4,021)
Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		360,011	277,923	[1]	1,030,137	734,473	[1]
Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		84	881	[1]	2,070	2,050	[1]
Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		38,658	71,487	[1]	130,167	188,488	[1]
Third Parties [Member]
Revenues and Other
Revenues and other		267,274	237,609	[1]	860,590	682,021	[1]
Operating expenses
Interest expense		(78,465)	(46,834)		(221,960)	(125,108)
Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		227,954	208,406	[1]	731,346	577,490	[1]
Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		9,392	22,455	[1]	43,460	67,371	[1]
Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		29,590	5,512	[1]	84,683	35,451	[1]
Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		338	1,236	[1]	1,101	1,709	[1]
WES Operating [Member]
Revenues and Other
Revenues and other		666,027	587,900	[1]	2,022,964	1,607,032	[1]
Equity income, net – affiliates		53,893	54,215	[1]	175,483	133,874	[1]
Operating expenses
Cost of product	[4]	97,800	101,035	[1]	334,740	291,009	[1]
Operation and maintenance	[4]	176,572	129,042	[1]	467,832	338,626	[1]
General and administrative	[4]	29,072	15,331	[1]	77,733	45,229	[1]
Property and other taxes		15,281	13,146	[1]	45,848	41,496	[1]
Depreciation and amortization		127,914	97,479	[1]	362,977	270,757	[1]
Impairments		3,107	27,902	[1]	4,294	155,286	[1]
Total operating expenses		449,746	383,935	[1]	1,293,424	1,142,403	[1]
Gain (loss) on divestiture and other, net		248	65	[1]	(1,403)	351	[1]
Operating income (loss)		270,422	258,245	[1]	903,620	598,854	[1]
Interest income – affiliates		4,225	4,225	[1]	12,675	12,675	[1]
Interest expense	[5]	(78,524)	(48,544)	[1]	(223,627)	(127,433)	[1]
Other income (expense), net		(67,902)	598	[1]	(161,648)	2,609	[1]
Income (loss) before income taxes		128,221	214,524	[1]	531,020	486,705	[1]
Income tax expense (benefit)		1,309	15,005	[1]	12,679	36,193	[1]
Net income (loss)		126,912	199,519	[1]	518,341	450,512	[1]
Net income (loss) attributable to noncontrolling interest		1,497	990	[1]	5,318	6,786	[1]
Net income (loss) attributable to Western Midstream Operating, LP		125,415	198,529	[1]	513,023	443,726	[1]
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		125,415	198,529	[1]	513,023	443,726	[1]
Pre-acquisition net (income) loss allocated to Anadarko		0	(43,883)	[1]	(29,279)	(107,009)	[1]
General partner interest in net (income) loss	[6]	0	(88,551)	[1]	0	(256,166)	[1]
WES Operating [Member] | Common Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)			$ 59,732			$ 69,638
Net income (loss) per common unit - basic and diluted	[1],[6]		$ 0.39			$ 0.46
WES Operating [Member] | Common and Class C Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)	[6]	125,415	$ 66,095	[1]	483,744	$ 80,551	[1]
WES Operating [Member] | Affiliates [Member]
Revenues and Other
Revenues and other		398,753	350,291	[1]	1,162,374	925,011	[1]
Operating expenses
Cost of product		61,100	39,700		185,500	112,500
Operation and maintenance		39,500	29,800		110,900	79,600
General and administrative		26,915	12,443		71,793	36,966
Interest expense		(60)	(2,000)		(1,900)	(4,000)
WES Operating [Member] | Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		360,011	277,923	[1]	1,030,137	734,473	[1]
WES Operating [Member] | Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		84	881	[1]	2,070	2,050	[1]
WES Operating [Member] | Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		38,658	71,487	[1]	130,167	188,488	[1]
WES Operating [Member] | Third Parties [Member]
Revenues and Other
Revenues and other		267,274	237,609	[1]	860,590	682,021	[1]
WES Operating [Member] | Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		227,954	208,406	[1]	731,346	577,490	[1]
WES Operating [Member] | Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		9,392	22,455	[1]	43,460	67,371	[1]
WES Operating [Member] | Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		29,590	5,512	[1]	84,683	35,451	[1]
WES Operating [Member] | Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		$ 338	$ 1,236	[1]	$ 1,101	$ 1,709	[1]

[1] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.

[2] Cost of product includes product purchases from affiliates (as defined in Note 1) of $61.1 million and $185.5 million for the three and nine months ended September 30, 2019, respectively, and $39.7 million and $112.5 million for the three and nine months ended September 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $39.5 million and $110.9 million for the three and nine months ended September 30, 2019, respectively, and $29.8 million and $79.6 million for the three and nine months ended September 30, 2018, respectively. General and administrative includes charges from affiliates of $27.7 million and $73.5 million for the three and nine months ended September 30, 2019, respectively, and $12.6 million and $37.6 million for the three and nine months ended September 30, 2018, respectively. See Note 6.

[3] Includes affiliate amounts of $0.06 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and $2.0 million and $4.0 million for the three and nine months ended September 30, 2018, respectively. See Note 1 and Note 10.

[4] Cost of product includes product purchases from affiliates (as defined in Note 1) of $61.1 million and $185.5 million for the three and nine months ended September 30, 2019, respectively, and $39.7 million and $112.5 million for the three and nine months ended September 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $39.5 million and $110.9 million for the three and nine months ended September 30, 2019, respectively, and $29.8 million and $79.6 million for the three and nine months ended September 30, 2018, respectively. General and administrative includes charges from affiliates of $26.9 million and $71.8 million for the three and nine months ended September 30, 2019, respectively, and $12.4 million and $37.0 million for the three and nine months ended September 30, 2018, respectively. See Note 6.

[5] Includes affiliate amounts of $0.06 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and $2.0 million and $4.0 million for the three and nine months ended September 30, 2018, respectively. See Note 1 and Note 10.

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