Debt - Debt Outstanding Table (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total short-term debt, principal	$ 168,499	$ 449,125
Total short-term debt, carrying value	168,104	448,825
Total long-term debt, carrying value	8,884,977	8,195,170
Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	168,104	449,543
Long-Term Debt Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt, principal	8,946,395	8,248,754
Total long-term debt, carrying value	8,884,977	8,195,170
Long-Term Debt Obligations [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	8,663,672	8,022,665
WES Operating [Member]
Debt Instrument [Line Items]
Total short-term debt, carrying value	168,104	448,825
Total long-term debt, carrying value	8,884,977	8,195,170
WES Operating [Member] \| Finance Lease Liability, Short Term [Member]
Debt Instrument [Line Items]
Finance leases - short-term debt	5,199	8,620
WES Operating [Member] \| Finance Lease Liability, Long Term [Member]
Debt Instrument [Line Items]
Finance leases - long-term debt	10,066	12,425
WES Operating [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member] \| Finance Lease Liability, Short Term [Member]
Debt Instrument [Line Items]
Finance leases - short-term debt	5,199	8,620
WES Operating [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member] \| Finance Lease Liability, Long Term [Member]
Debt Instrument [Line Items]
Finance leases - long-term debt	10,066	12,425
WES Operating [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Principal	8,936,329	8,236,329
Long-term debt, carrying value	8,874,911	8,182,745
WES Operating [Member] \| Senior Notes [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	8,653,606	8,010,240
WES Operating [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Principal	0	440,505
Short-term debt, carrying value	0	440,205
WES Operating [Member] \| Senior Notes [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	0	440,923
WES Operating [Member] \| Commercial Paper Program \| Commercial Paper Program
Debt Instrument [Line Items]
Principal	163,300	0
Commercial paper, carrying value	162,905	0
WES Operating [Member] \| Commercial Paper Program \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member] \| Commercial Paper Program
Debt Instrument [Line Items]
Short-term debt, fair value	$ 162,905	$ 0

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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