Consolidated Balance Sheets - WES Operating (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Materials and supplies inventory		$ 56,200	$ 71,900
Total assets	[1]	11,273,079	11,830,027
Accounts receivable, net		436,513	452,880
Total liabilities	[2]	8,177,319	8,934,815
Related Parties [Member]
Total assets		1,405,376	1,572,526
Accounts receivable, net		180,205	291,253
Total liabilities		270,521	164,655
Natural-Gas Liquids [Member]
NGLs line-fill inventory		9,800	4,200
WES Operating [Member]
Materials and supplies inventory		56,200	71,900
Total assets	[3]	11,264,847	11,756,293
Accounts receivable, net		436,513	407,549
Total liabilities	[4]	8,172,181	8,895,542
WES Operating [Member] | Related Parties [Member]
Total assets		1,400,000	1,500,000
Accounts receivable, net		180,205	246,083
Total liabilities		318,700	164,300
WES Operating [Member] | Natural-Gas Liquids [Member]
NGLs line-fill inventory		$ 9,800	$ 4,200

[1] 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.

[2] 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.

[3] Total assets includes related-party amounts of $1.4 billion and $1.5 billion as of December 31, 2021 and 2020, respectively, which includes related-party Accounts receivable, net of $180.2 million and $246.1 million as of December 31, 2021 and 2020, respectively. See Note 6.

[4] Total liabilities includes related-party amounts of $318.7 million and $164.3 million as of December 31, 2021 and 2020, respectively. See Note 6.