Consolidated Statements of Operations - WES Operating - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Revenues and Other
Revenues and other		$ 685,054	$ 518,078	[1]	$ 1,356,937	$ 1,019,132	[1]
Equity income, net – affiliates		63,598	49,430	[1]	121,590	79,659	[1]
Operating expenses
Cost of product	[2]	122,877	95,656	[1]	236,940	189,974	[1]
Operation and maintenance	[2]	148,431	112,789	[1]	291,260	209,584	[1]
General and administrative	[2]	30,027	15,597	[1]	52,871	31,426	[1]
Property and other taxes		14,282	13,750	[1]	30,567	28,350	[1]
Depreciation and amortization		121,117	88,488	[1]	235,063	173,278	[1]
Impairments		797	127,184	[1]	1,187	127,384	[1]
Total operating expenses		437,531	453,464	[1]	847,888	759,996	[1]
Gain (loss) on divestiture and other, net		(1,061)	170	[1]	(1,651)	286	[1]
Operating income (loss)		310,060	114,214	[1]	628,988	339,081	[1]
Interest income – affiliates		4,225	4,225	[1]	8,450	8,450	[1]
Interest expense	[3]	(79,472)	(42,245)	[1]	(145,348)	(80,260)	[1]
Other income (expense), net		(58,477)	1,277	[1]	(93,683)	2,094	[1]
Income (loss) before income taxes		176,336	77,471	[1]	398,407	269,365	[1]
Income tax expense (benefit)		1,278	10,304	[1]	11,370	21,188	[1]
Net income (loss)		175,058	67,167	[1]	387,037	248,177	[1]
Net income (loss) attributable to noncontrolling interest		5,464	(33,017)	[1]	98,783	16,466	[1]
Net income (loss) attributable to Western Midstream Operating, LP		169,594	100,184	[1]	288,254	231,711	[1]
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		169,594	100,184	[1]	288,254	231,711	[1]
Pre-acquisition net (income) loss allocated to Anadarko		(163)	(32,604)	[1]	(29,279)	(63,126)	[1]
Limited partners' interest in net income (loss)		169,431	67,580	[1]	258,975	168,585	[1]
Affiliates [Member]
Revenues and Other
Revenues and other		385,184	289,544	[1]	763,621	574,720	[1]
Operating expenses
Cost of product		68,225	38,001		124,397	72,820
Operation and maintenance		32,318	26,826		71,459	49,827
General and administrative		26,892	12,262		45,786	24,950
Total operating expenses		127,435	77,089		241,642	147,597
Interest expense		(20)	(1,409)		(1,853)	(1,986)
Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		343,484	234,512	[1]	670,126	456,550	[1]
Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		634	538	[1]	1,986	1,169	[1]
Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		41,066	54,494	[1]	91,509	117,001	[1]
Third Parties [Member]
Revenues and Other
Revenues and other		299,870	228,534	[1]	593,316	444,412	[1]
Operating expenses
Interest expense		(79,452)	(40,836)		(143,495)	(78,274)
Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		250,060	197,349	[1]	503,392	369,084	[1]
Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		16,041	22,124	[1]	34,068	44,916	[1]
Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		33,403	8,821	[1]	55,093	29,939	[1]
Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		366	240	[1]	763	473	[1]
WES Operating [Member]
Revenues and Other
Revenues and other		685,054	518,078	[1]	1,356,937	1,019,132	[1]
Equity income, net – affiliates		63,598	49,430	[1]	121,590	79,659	[1]
Operating expenses
Cost of product	[4]	122,877	95,656	[1]	236,940	189,974	[1]
Operation and maintenance	[4]	148,431	112,789	[1]	291,260	209,584	[1]
General and administrative	[4]	28,101	14,901	[1]	48,661	29,898	[1]
Property and other taxes		14,282	13,750	[1]	30,567	28,350	[1]
Depreciation and amortization		121,117	88,488	[1]	235,063	173,278	[1]
Impairments		797	127,184	[1]	1,187	127,384	[1]
Total operating expenses		435,605	452,768	[1]	843,678	758,468	[1]
Gain (loss) on divestiture and other, net		(1,061)	170	[1]	(1,651)	286	[1]
Operating income (loss)		311,986	114,910	[1]	633,198	340,609	[1]
Interest income – affiliates		4,225	4,225	[1]	8,450	8,450	[1]
Interest expense	[5]	(79,472)	(41,937)	[1]	(145,103)	(78,889)	[1]
Other income (expense), net		(58,482)	1,229	[1]	(93,746)	2,011	[1]
Income (loss) before income taxes		178,257	78,427	[1]	402,799	272,181	[1]
Income tax expense (benefit)		1,278	10,304	[1]	11,370	21,188	[1]
Net income (loss)		176,979	68,123	[1]	391,429	250,993	[1]
Net income (loss) attributable to noncontrolling interest		1,967	2,811	[1]	3,821	5,796	[1]
Net income (loss) attributable to Western Midstream Operating, LP		175,012	65,312	[1]	387,608	245,197	[1]
Limited partners' interest in net income (loss):
Net income (loss) attributable to Western Midstream Operating, LP		175,012	65,312	[1]	387,608	245,197	[1]
Pre-acquisition net (income) loss allocated to Anadarko		(163)	(32,604)	[1]	(29,279)	(63,126)	[1]
General partner interest in net (income) loss	[6]	0	(84,176)	[1]	0	(167,615)	[1]
WES Operating [Member] | Common Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)			$ (48,417)			$ 9,906
Net income (loss) per common unit - basic and diluted	[1],[6]		$ (0.32)			$ 0.06
WES Operating [Member] | Common and Class C Units [Member]
Limited partners' interest in net income (loss):
Limited partners' interest in net income (loss)	[6]	174,849	$ (51,468)	[1]	358,329	$ 14,456	[1]
WES Operating [Member] | Affiliates [Member]
Revenues and Other
Revenues and other		385,184	289,544	[1]	763,621	574,720	[1]
Operating expenses
Cost of product		68,200	38,000		124,400	72,800
Operation and maintenance		32,300	26,800		71,500	49,800
General and administrative		26,380	12,044		44,878	24,523
Interest expense		(20)	(1,400)		(1,900)	(2,000)
WES Operating [Member] | Affiliates [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		343,484	234,512	[1]	670,126	456,550	[1]
WES Operating [Member] | Affiliates [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		634	538	[1]	1,986	1,169	[1]
WES Operating [Member] | Affiliates [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		41,066	54,494	[1]	91,509	117,001	[1]
WES Operating [Member] | Third Parties [Member]
Revenues and Other
Revenues and other		299,870	228,534	[1]	593,316	444,412	[1]
WES Operating [Member] | Third Parties [Member] | Service Revenues - Fee Based [Member]
Revenues and Other
Revenues and other		250,060	197,349	[1]	503,392	369,084	[1]
WES Operating [Member] | Third Parties [Member] | Service Revenues - Product Based [Member]
Revenues and Other
Revenues and other		16,041	22,124	[1]	34,068	44,916	[1]
WES Operating [Member] | Third Parties [Member] | Product Sales [Member]
Revenues and Other
Revenues and other		33,403	8,821	[1]	55,093	29,939	[1]
WES Operating [Member] | Third Parties [Member] | Other [Member]
Revenues and Other
Revenues and other		$ 366	$ 240	[1]	$ 763	$ 473	[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 $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.9 million and $45.8 million for the three and six months ended June 30, 2019, respectively, and $12.3 million and $25.0 million for the three and six months ended June 30, 2018, respectively. See Note 6.

[3] Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.

[4] Cost of product includes product purchases from affiliates (as defined in Note 1) of $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.4 million and $44.9 million for the three and six months ended June 30, 2019, respectively, and $12.0 million and $24.5 million for the three and six months ended June 30, 2018, respectively. See Note 6.

[5] Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.

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