Related-Party Transactions - Summary of WES Related-Party Transactions Tables (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Consolidated statements of operations [Abstract]
Revenues and other	[1]	$ 837,568	$ 763,840	$ 2,472,284	$ 2,157,945
Equity income, net – related parties		41,317	48,506	139,388	159,337
Cost of product		106,833	83,232	328,237	250,245
Operation and maintenance		190,514	140,838	487,643	434,198
General and administrative		48,185	50,409	144,635	139,973
Operating expenses	[2]	521,763	428,716	1,451,558	1,307,010
Consolidated balance sheets [Abstract]
Accounts receivable, net		650,922		650,922		$ 436,513
Other current assets		86,285		86,285		46,252
Equity investments		1,142,103		1,142,103		1,167,187
Other assets	[3]	168,721		168,721		158,696
Total assets	[4]	11,472,582		11,472,582		11,273,079
Accounts and imbalance payables		492,776		492,776		326,061
Accrued liabilities		189,625		189,625		263,249
Other liabilities		368,930		368,930		325,806
Total liabilities	[5]	8,466,896		8,466,896		8,177,319
Consolidated statements of cash flows [Abstract]
Distributions from equity-investment earnings – related parties				139,710	164,772
Capital expenditures	[6]			(341,505)	(219,757)
Contributions to equity investments – related parties				(8,899)	(3,683)
Distributions from equity investments in excess of cumulative earnings – related parties				41,058	30,075
Distributions to Partnership unitholders	[7]			(538,690)	(398,896)
Net contributions from (distributions to) related parties				1,161	6,673
Unit repurchases from Occidental	[7]			(447,075)	(104,366)
Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		666,555	650,482	1,954,105	1,841,742
Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		91,356	28,812	202,721	88,267
Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		79,430	84,298	314,755	227,359
Related Parties [Member]
Consolidated statements of operations [Abstract]
Revenues and other		476,513	431,681	1,362,003	1,225,375
Cost of product		(7,771)	17,384	(39,462)	53,968
Operation and maintenance		3,231	3,497	3,874	24,534
General and administrative		81	1,808	2,289	13,003
Operating expenses		(4,459)	22,689	(33,299)	91,505
Consolidated balance sheets [Abstract]
Accounts receivable, net		327,285		327,285		180,205
Other current assets		18,486		18,486		12,490
Other assets		45,544		45,544		45,494
Total assets		1,533,418		1,533,418		1,405,376
Accounts and imbalance payables		65,484		65,484		49,242
Accrued liabilities		7,439		7,439		13,914
Other liabilities		253,912		253,912		207,365
Total liabilities		326,835		326,835		$ 270,521
Consolidated statements of cash flows [Abstract]
Capital expenditures				0	(2,000)
Distributions to Partnership unitholders				(260,774)	(195,205)
Unit repurchases from Occidental				(252,500)	0
Related Parties [Member] | WES Operating [Member]
Consolidated statements of cash flows [Abstract]
Distributions to Partnership unitholders				(20,177)	(9,934)
Related Parties [Member] | Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		431,944	418,520	1,275,474	1,188,679
Related Parties [Member] | Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		24,246	1,499	48,297	9,662
Related Parties [Member] | Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		$ 20,323	$ 11,662	$ 38,232	$ 27,034

[1] Total revenues and other includes related-party amounts of $476.5 million and $1.4 billion for the three and nine months ended September 30, 2022, respectively, and $431.7 million and $1.2 billion for the three and nine months ended September 30, 2021, respectively. See Note 6.

[2] Total operating expenses includes related-party amounts of $(4.5) million and $(33.3) million for the three and nine months ended September 30, 2022, respectively, and $22.7 million and $91.5 million for the three and nine months ended September 30, 2021, respectively. See Note 6.

[3] Other assets includes $9.3 million and $9.8 million of NGLs line-fill inventory as of September 30, 2022, and December 31, 2021, respectively. Other assets also includes $61.3 million and $56.2 million of materials and supplies inventory as of September 30, 2022, and December 31, 2021, respectively.

[4] Total assets includes related-party amounts of $1.5 billion and $1.4 billion as of September 30, 2022, and December 31, 2021, respectively, which includes related-party Accounts receivable, net of $327.3 million and $180.2 million as of September 30, 2022, and December 31, 2021, respectively. See Note 6.

[5] Total liabilities includes related-party amounts of $326.8 million and $270.5 million as of September 30, 2022, and December 31, 2021, respectively. See Note 6.

[6] Includes purchases from related parties of $2.0 million for the nine months ended September 30, 2021. See Note 6.

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