Debt and Interest Expense - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt	$ 8,565,000	$ 0	$ 15,378,000	$ 91,000
WES Operating [Member]
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt	8,565,000	$ 0	15,378,000	$ 91,000
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount	0		0		$ 375,000,000
Facility, maximum borrowing capacity	2,000,000,000		2,000,000,000
Facility, expandable maximum borrowing capacity	2,500,000,000		2,500,000,000
Facility, outstanding borrowings	0		0
Facility, outstanding letters of credit	5,100,000		5,100,000
Facility, available borrowing capacity	$ 2,000,000,000		$ 2,000,000,000
Facility, interest rate at period end	6.62%	4.65%	6.62%	4.65%
Facility, fee rate			0.20%	0.25%
WES Operating [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of senior notes			$ 276,700,000
Gain (loss) on early extinguishment of debt	$ 8,600,000		$ 15,400,000
WES Operating [Member] | Senior Notes [Member] | 3.100% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	3.10%		3.10%
Senior note, effective interest rate	3.29%	3.79%	3.29%	3.79%
Principal amount	$ 666,481,000		$ 666,481,000		730,706,000
Repayments of senior notes			$ 64,225,000	$ 1,400,000
WES Operating [Member] | Senior Notes [Member] | 4.050% Senior Notes due 2030 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	4.05%		4.05%
Senior note, effective interest rate	4.169%	4.671%	4.169%	4.671%
Principal amount	$ 1,104,593,000		$ 1,104,593,000		1,200,000,000
Repayments of senior notes			$ 95,407,000
WES Operating [Member] | Senior Notes [Member] | 5.250% Senior Notes due 2050 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	5.25%		5.25%
Senior note, effective interest rate	5.363%	5.869%	5.363%	5.869%
Principal amount	$ 1,000,000,000		$ 1,000,000,000		1,000,000,000
WES Operating [Member] | Senior Notes [Member] | 6.350% Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	6.35%		6.35%
Principal amount	$ 600,000,000		$ 600,000,000		0
WES Operating [Member] | Senior Notes [Member] | 6.150% Senior Notes due 2033 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	6.15%		6.15%
Principal amount	$ 750,000,000		$ 750,000,000		$ 0
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Senior note, interest rate		4.00%		4.00%