Debt and Interest Expense - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt	$ 0	$ 8,565,000	$ 5,403,000	$ 15,378,000
WES Operating [Member]
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt	0	$ 8,565,000	5,403,000	$ 15,378,000
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
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	0		0
Facility, available borrowing capacity	$ 2,000,000,000		$ 2,000,000,000
Facility, interest rate at period end	6.15%	6.62%	6.15%	6.62%
Facility, fee rate			0.20%	0.20%
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member] | Non-Extending Lenders [Member]
Debt Instrument [Line Items]
Facility, maximum borrowing capacity	$ 120,000,000		$ 120,000,000
WES Operating [Member] | Commercial Paper Program | Commercial Paper Program
Debt Instrument [Line Items]
Principal amount	0		0		$ 613,885,000
Facility, maximum borrowing capacity	$ 2,000,000,000		$ 2,000,000,000
WES Operating [Member] | Commercial Paper Program | Commercial Paper Program | Maximum [Member]
Debt Instrument [Line Items]
Commercial paper, term			397 days
WES Operating [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of senior notes			$ 150,000,000		276,700,000
Gain (loss) on early extinguishment of debt			$ 5,400,000
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%	3.29%	3.29%	3.29%
Principal amount	$ 663,831,000		$ 663,831,000		666,481,000
Repayments of senior notes			$ 2,650,000
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%	4.169%	4.169%	4.169%
Principal amount	$ 1,057,134,000		$ 1,057,134,000		1,104,593,000
Repayments of senior notes			$ 47,459,000
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%	5.363%	5.363%	5.363%
Principal amount	$ 1,000,000,000		$ 1,000,000,000		1,000,000,000
WES Operating [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2034 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	5.45%		5.45%
Principal amount	$ 800,000,000		$ 800,000,000
WES Operating [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Senior note, interest rate	3.95%		3.95%
Principal amount	$ 336,758,000		$ 336,758,000		349,163,000
Repayments of senior notes			$ 12,405,000
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		600,000,000
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		$ 750,000,000