Related-Party Transactions - Summary of WES Related-Party Transactions Tables (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Consolidated statements of operations [Abstract]
Revenues and other	[1]	$ 776,013	$ 837,568	$ 2,248,268	$ 2,472,284
Equity income, net – related parties		35,494	41,317	116,839	139,388
Cost of product		27,590	106,833	123,795	328,237
Operation and maintenance		204,434	190,514	562,104	487,643
General and administrative		55,050	48,185	159,572	144,635
Total operating expenses	[2]	449,265	521,763	1,373,793	1,451,558
Consolidated balance sheets [Abstract]
Accounts receivable, net		614,836		614,836		$ 554,263
Other current assets		31,476		31,476		59,506
Equity investments		915,076		915,076		944,696
Other assets	[3]	217,163		217,163		167,049
Total assets	[4]	11,626,554		11,626,554		11,271,628
Accounts and imbalance payables		393,358		393,358		360,562
Accrued liabilities		189,983		189,983		254,640
Other liabilities		452,188		452,188		385,629
Total liabilities	[5]	8,671,462		8,671,462		8,163,513
Consolidated statements of cash flows [Abstract]
Distributions from equity-investment earnings – related parties				115,897	139,710
Contributions to equity investments – related parties				(1,153)	(8,899)
Distributions from equity investments in excess of cumulative earnings – related parties				31,715	41,058
Distributions to Partnership unitholders	[6]			(754,998)	(538,690)
Net contributions from (distributions to) related parties				0	1,161
Unit repurchases from Occidental	[6]			(134,602)	(447,075)
Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		695,547	666,555	2,004,920	1,954,105
Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		48,446	91,356	142,212	202,721
Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		31,652	79,430	100,336	314,755
Related Parties [Member]
Consolidated statements of operations [Abstract]
Revenues and other		463,623	476,513	1,353,991	1,362,003
Cost of product		(37,083)	(7,771)	(56,214)	(39,462)
Operation and maintenance		843	3,231	2,493	3,874
General and administrative		414	81	698	2,289
Total operating expenses		(35,826)	(4,459)	(53,023)	(33,299)
Consolidated balance sheets [Abstract]
Accounts receivable, net		340,927		340,927		313,937
Other current assets		461		461		1,578
Other assets		37,880		37,880		29,058
Total assets		1,294,344		1,294,344		1,289,269
Accounts and imbalance payables		34,307		34,307		32,150
Accrued liabilities		2,974		2,974		11,756
Other liabilities		323,562		323,562		268,399
Total liabilities		360,843		360,843		$ 312,305
Consolidated statements of cash flows [Abstract]
Distributions to Partnership unitholders				(382,438)	(272,797)
Unit repurchases from Occidental				(127,500)	(252,500)
Related Parties [Member] | WES Operating [Member]
Consolidated statements of cash flows [Abstract]
Distributions to Partnership unitholders				(18,260)	(20,177)
Related Parties [Member] | Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		454,039	431,944	1,300,870	1,275,474
Related Parties [Member] | Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		(234)	24,246	14,524	48,297
Related Parties [Member] | Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		$ 9,818	$ 20,323	$ 38,597	$ 38,232

[1] Total revenues and other includes related-party amounts of $463.6 million and $1.4 billion for the three and nine months ended September 30, 2023, respectively, and $476.5 million and $1.4 billion for the three and nine months ended September 30, 2022, respectively. See Note 6.

[2] Total operating expenses includes related-party amounts of $(35.8) million and $(53.0) million for the three and nine months ended September 30, 2023, respectively, and $(4.5) million and $(33.3) million for the three and nine months ended September 30, 2022, respectively, all primarily related to changes in imbalance positions. See Note 6.

[3] Other assets includes $6.5 million of NGLs line-fill inventory as of September 30, 2023, and December 31, 2022. Other assets also includes $92.4 million and $60.4 million of materials and supplies inventory as of September 30, 2023, and December 31, 2022, respectively.

[4] Total assets includes related-party amounts of $1.3 billion as of September 30, 2023, and December 31, 2022, which includes related-party Accounts receivable, net of $340.9 million and $313.9 million as of September 30, 2023, and December 31, 2022, respectively. See Note 6.

[5] Total liabilities includes related-party amounts of $360.8 million and $312.3 million as of September 30, 2023, and December 31, 2022, respectively. See Note 6.

[6] Includes related-party amounts. See Note 6.