Related-Party Transactions - Summary of WES Related-Party Transactions Tables (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated statements of operations [Abstract]
Revenues and other	[1]	$ 2,877,155	$ 2,772,592	$ 2,746,174
Equity income, net – related parties		204,645	226,750	237,518
Cost of product		322,285	188,088	444,247
Operation and maintenance		581,300	580,874	641,219
General and administrative		195,549	155,769	114,591
Operating expenses	[2]	1,745,573	2,129,063	1,750,943
Gain (loss) on divestiture and other, net		44	8,634	(1,406)
Interest income – Anadarko note receivable		0	11,736	16,900
Interest expense		(376,512)	(380,058)	(303,286)
Consolidated balance sheets [Abstract]
Accounts receivable, net		436,513	452,880
Other current assets		46,252	45,262
Equity investments		1,167,187	1,224,813	1,285,717
Other assets	[3]	158,696	171,013
Total assets	[4]	11,273,079	11,830,027
Accounts and imbalance payables		326,061	210,691
Accrued liabilities		263,249	269,947
Other liabilities		325,806	275,570
Total liabilities	[5]	8,177,319	8,934,815
Consolidated statements of cash flows [Abstract]
Distributions from equity-investment earnings – related parties		213,516	246,637	234,572
Capital expenditures	[6]	(313,674)	(423,602)	(1,189,254)
Contributions to equity investments – related parties		(4,435)	(19,388)	(128,393)
Distributions from equity investments in excess of cumulative earnings – related parties		41,385	32,160	30,256
Distributions to Partnership unitholders	[7]	(533,758)	(695,834)	(969,073)
Net contributions from (distributions to) related parties		8,533	24,466	458,819
Above-market component of swap agreements with Anadarko	[7]	0	0	7,407
Finance lease payments	[8]	(6,513)	(14,207)	(508)
Unit repurchases	[9]	(217,465)	(32,535)	0
Occidental [Member]
Consolidated statements of cash flows [Abstract]
Unit repurchases		$ (50,200)
Unit repurchases, number of units		2,500,000
Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		$ 2,462,835	2,584,323	2,388,191
Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		122,584	48,369	70,127
Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		290,947	138,559	286,388
Related Parties [Member]
Consolidated statements of operations [Abstract]
Revenues and other		1,632,358	1,820,612	1,607,396
Cost of product		42,805	92,884	254,771
Operation and maintenance		27,805	49,533	146,990
General and administrative		15,613	40,295	101,485
Operating expenses		86,223	182,712	503,246
Gain (loss) on divestiture and other, net		420	(2,870)	0
Interest expense		0	(6)	(1,970)
Consolidated balance sheets [Abstract]
Accounts receivable, net		180,205	291,253
Other current assets		12,490	5,493
Other assets		45,494	50,967
Total assets		1,405,376	1,572,526
Accounts and imbalance payables		49,242	6,664
Accrued liabilities		13,914	19,195
Other liabilities		207,365	138,796
Total liabilities		270,521	164,655
Consolidated statements of cash flows [Abstract]
Capital expenditures		(2,000)	0	(425)
Acquisitions from related parties		0	0	(2,007,501)
APCWH Note Payable borrowings		0	0	11,000
Repayment of APCWH Note Payable		0	0	(439,595)
Distributions to Partnership unitholders		(260,703)	(367,861)	(566,868)
Finance lease payments		0	(6,382)	(508)
Unit repurchases		(50,225)	0	0
Related Parties [Member] | WES Operating [Member]
Consolidated statements of cash flows [Abstract]
Distributions to Partnership unitholders		(14,984)	(15,434)	(19,768)
Related Parties [Member] | Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		1,589,367	1,740,999	1,441,875
Related Parties [Member] | Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other		11,888	8,509	7,062
Related Parties [Member] | Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other		$ 31,103	$ 71,104	$ 158,459

[1] Total revenues and other includes related-party amounts of $1.6 billion, $1.8 billion, and $1.6 billion for the years ended December 31, 2021, 2020, and 2019, respectively. See Note 6.

[2] Total operating expenses includes related-party amounts of $86.2 million, $182.7 million, and $503.2 million for the years ended December 31, 2021, 2020, and 2019, respectively. See Note 6.

[3] Other assets includes $9.8 million and $4.2 million of NGLs line-fill inventory as of December 31, 2021 and 2020, respectively. Other assets also includes $56.2 million and $71.9 million of materials and supplies inventory as of December 31, 2021 and 2020, respectively.

[4] Total assets includes related-party amounts of $1.4 billion and $1.6 billion as of December 31, 2021 and 2020, respectively, which includes related-party Accounts receivable, net of $180.2 million and $291.3 million as of December 31, 2021 and 2020, respectively. See Note 6.

[5] Total liabilities includes related-party amounts of $270.5 million and $164.7 million as of December 31, 2021 and 2020, respectively. See Note 6.

[6] Includes purchases from related parties of $2.0 million and $0.4 million for the years ended December 31, 2021 and 2019, respectively. See Note 6.

[7] See Note 6.

[8] For the year ended December 31, 2020, includes related-party payments of $6.4 million.

[9] Includes unit repurchases from Occidental of $50.2 million for the year ended December 31, 2021. See Note 5.