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Debt - Debt Activity Table (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Changes in Debt Outstanding [Roll Forward] |  |
Beginning balance | $ 8,643,995 |
Commercial paper borrowings (repayments), net | 162,905 | $ 0
Ending balance | 9,053,081 |
WES Operating [Member] |  |
Changes in Debt Outstanding [Roll Forward] |  |
Commercial paper borrowings (repayments), net | 162,905 | $ 0
Other | (7,534) |
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member] |  |
Changes in Debt Outstanding [Roll Forward] |  |
RCF borrowings | 360,000 |
RCF repayment | (360,000) |
WES Operating [Member] | Commercial Paper Program | Commercial Paper Program |  |
Changes in Debt Outstanding [Roll Forward] |  |
Commercial paper borrowings (repayments), net | 162,905 |
WES Operating [Member] | 4.650% Senior Notes due 2026 [Member] | Senior Notes [Member] |  |
Changes in Debt Outstanding [Roll Forward] |  |
Repayments of senior notes | (440,505) |
WES Operating [Member] | 5.700% Senior Notes due 2036 [Member] | Senior Notes [Member] |  |
Changes in Debt Outstanding [Roll Forward] |  |
Proceeds from issuance senior notes | 700,000 |
WES Operating [Member] | Finance Lease Liability [Member] |  |
Changes in Debt Outstanding [Roll Forward] |  |
Finance lease liabilities | $ (5,780) |

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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