Related-Party Transactions - Summary of WES Related-Party Transactions Tables (Details) - USD ($)			3 Months Ended		6 Months Ended
		Jul. 03, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Consolidated statements of operations [Abstract]
Revenues and other	[1]		$ 671,755,000	$ 685,054,000	$ 1,446,068,000	$ 1,356,937,000
Equity income, net – related parties			54,415,000	63,598,000	115,762,000	121,590,000
Cost of product			18,602,000	122,877,000	121,872,000	236,940,000
Operation and maintenance			145,186,000	148,431,000	304,377,000	291,260,000
General and administrative			36,423,000	30,027,000	76,888,000	52,871,000
Operating expenses	[2]		349,561,000	437,531,000	1,400,084,000	847,888,000
Interest income – Anadarko note receivable			4,225,000	4,225,000	8,450,000	8,450,000
Interest expense			(94,654,000)	(79,472,000)	(183,240,000)	(145,348,000)
Consolidated balance sheets [Abstract]
Accounts receivable, net			460,318,000		460,318,000		$ 260,512,000
Other current assets			39,107,000		39,107,000		41,938,000
Equity investments			1,280,047,000		1,280,047,000		1,285,717,000
Other assets	[3]		142,496,000		142,496,000		78,202,000
Total assets	[4]		11,953,243,000		11,953,243,000		12,346,453,000
Accounts and imbalance payables			181,563,000		181,563,000		293,128,000
Accrued liabilities			217,225,000		217,225,000		149,793,000
Other liabilities			234,615,000		234,615,000		208,346,000
Total liabilities	[5]		9,017,726,000		9,017,726,000		9,001,160,000
(Increase) decrease in accounts receivable, net					(200,136,000)	2,668,000
Consolidated statements of cash flows [Abstract]
Distributions from equity-investment earnings – related parties					124,156,000	115,483,000
Contributions to equity investments - related parties					(16,064,000)	(77,333,000)
Distributions from equity investments in excess of cumulative earnings – related parties					13,340,000	17,052,000
Distributions to Partnership unitholders	[6]				(422,679,000)	(408,234,000)
Net contributions from (distributions to) related parties					21,832,000	456,938,000
Above-market component of swap agreements with Anadarko	[6]				0	7,407,000
Finance lease payments	[7]				(10,262,000)	0
Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other			642,628,000	593,544,000	1,344,024,000	1,173,518,000
Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other			7,000,000	16,675,000	22,921,000	36,054,000
Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other			21,736,000	74,469,000	78,385,000	146,602,000
Related Parties [Member]
Consolidated statements of operations [Abstract]
Revenues and other			473,442,000	385,184,000	955,827,000	763,621,000
Cost of product			5,967,000	68,225,000	83,870,000	124,397,000
Operation and maintenance			1,516,000	32,318,000	34,357,000	71,459,000
General and administrative			10,994,000	26,892,000	32,849,000	45,786,000
Operating expenses			18,477,000	127,435,000	151,076,000	241,642,000
Interest expense			0	(20,000)	(43,000)	(1,853,000)
Consolidated balance sheets [Abstract]
Accounts receivable, net			325,349,000		325,349,000		113,345,000
Other current assets			13,019,000		13,019,000		4,982,000
Anadarko note receivable			259,481,000		259,481,000		260,000,000
Other assets			59,302,000		59,302,000		60,221,000
Total assets			1,937,198,000		1,937,198,000		1,724,265,000
Accounts and imbalance payables			655,000		655,000		0
Short-term debt			0		0		7,873,000
Accrued liabilities			2,513,000		2,513,000		3,087,000
Other liabilities			119,132,000		119,132,000		97,800,000
Total liabilities			122,300,000		122,300,000		$ 108,760,000
Consolidated statements of cash flows [Abstract]
Acquisitions from related parties					0	(2,007,501,000)
APCWH Note Payable borrowings					0	11,000,000
Repayment of APCWH Note Payable					0	(439,595,000)
Distributions to Partnership unitholders					(225,914,000)	(255,885,000)
Finance lease payments					(6,382,000)	0
Related Parties [Member] | Subsequent Event [Member]
Consolidated balance sheets [Abstract]
(Increase) decrease in accounts receivable, net		$ 141,800,000
Related Parties [Member] | WES Operating [Member]
Consolidated statements of cash flows [Abstract]
Distributions to Partnership unitholders					(8,676,000)	(8,210,000)
Related Parties [Member] | Service Revenues - Fee Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other			460,138,000	343,484,000	907,921,000	670,126,000
Related Parties [Member] | Service Revenues - Product Based [Member]
Consolidated statements of operations [Abstract]
Revenues and other			1,168,000	634,000	4,146,000	1,986,000
Related Parties [Member] | Product Sales [Member]
Consolidated statements of operations [Abstract]
Revenues and other			$ 12,136,000	$ 41,066,000	$ 43,760,000	$ 91,509,000

[1] Total revenues and other includes related-party amounts of $473.4 million and $955.8 million for the three and six months ended June 30, 2020, respectively, and $385.2 million and $763.6 million for the three and six months ended June 30, 2019, respectively. See Note 6.

[2] Total operating expenses includes related-party amounts of $18.5 million and $151.1 million for the three and six months ended June 30, 2020, respectively, and $127.4 million and $241.6 million for the three and six months ended June 30, 2019, respectively. See Note 6.

[3] Other assets includes $3.2 million and $4.5 million of NGLs line-fill inventory as of June 30, 2020, and December 31, 2019, respectively. Other assets also includes $62.6 million of materials and supplies inventory as of June 30, 2020. See Note 1.

[4] Total assets includes related-party amounts of $1.9 billion and $1.7 billion as of June 30, 2020, and December 31, 2019, respectively, which includes related-party Accounts receivable, net of $325.3 million and $113.3 million as of June 30, 2020, and December 31, 2019, respectively. See Note 6.

[5] Total liabilities includes related-party amounts of $122.3 million and $108.8 million as of June 30, 2020, and December 31, 2019, respectively. See Note 6.

[6] See Note 6.

[7] For the six months ended June 30, 2020, includes related-party payments of $6.4 million.