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THE ACQUISITION - NARRATIVE (Details) - USD ($) |  | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 26, 2020 | Aug. 07, 2019 | Jul. 01, 2019 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  | $ 37,401,000,000 | $ 35,235,000,000 | $ 37,401,000,000 |  |  |  |
WES | Public Ownership | WES |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Limited partner interest |  |  |  | 44.60% | 44.60% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 3,000,000,000.0 |  |
Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of warrant (in dollars per share) |  |  |  |  |  | $ 59.624 |  |  |
Senior notes |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  | $ 7,000,000,000.0 |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 5,000,000,000.0 | $ 3,000,000,000.0
Anadarko Petroleum Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash of acquirer in exchange for acquiree (usd per share) | $ 59.00 |  |  |  |  |  |  |  |
Exchange ratio (per share of Anadarko common stock) | 0.2934 |  |  |  |  |  |  |  |
Closing price per share, common stock (usd per share) | $ 46.31 |  |  |  |  |  |  |  |
Debt instrument issued | $ 21,800,000,000 |  |  |  |  |  |  |  |
Shares issued (in shares) | 144,000,000 |  |  |  |  |  |  |  |
Amount from exercise of warrants | $ 10,000,000,000 |  |  |  |  |  |  |  |
Assumed debt | 13,240,000,000 |  |  |  |  |  |  |  |
Property, plant and equipment | 49,125,000,000 |  |  |  |  |  |  |  |
Revenues from date of merger |  |  | 4,200,000,000 |  |  |  |  |  |
Net loss attributable to common shareholders from date of merger |  |  | 1,700,000,000 |  |  |  |  |  |
Long-term debt | 11,900,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | WES |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revenues from date of merger |  |  | $ 1,100,000,000 |  |  |  |  |  |
Anadarko Petroleum Corporation | Proved gas and oil properties |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment | 19,100,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Unproved Properties |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment | 27,400,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Land, Mineral Interests And Corporate Properties |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 2,500,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Customer Relationships |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Amortization period | 30 years |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Level 2 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Assumed debt | $ 2,500,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | WES |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Assumed debt | 7,407,000,000 |  |  |  |  |  |  |  |
Property, plant and equipment | 10,160,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | WES | Level 2 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Assumed debt | 730,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, additional commitment | $ 2,000,000,000.0 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Series A Preferred Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 100,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Common Stock |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of securities called by warrant (in shares) | 80,000,000 |  |  |  |  |  |  |  |
Exercise price of warrant (in dollars per share) | $ 62.50 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Senior notes |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued | $ 13,000,000,000.0 |  |  |  |  |  |  |  |
Long-term debt | 11,900,000,000 |  |  |  |  |  |  |  |
Amount tendered and accepted in exchange offers, percentage |  | 97.00% |  |  |  |  |  |  |
Amount tendered and accepted in exchange offers, |  | $ 11,500,000,000 |  |  |  |  |  |  |
Portion not exchanged |  | $ 400,000,000 |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Secured Debt |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued | 8,800,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Line of Credit | Senior Unsecured Term Loan Facility, 364-Day |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued | 4,400,000,000 |  |  |  |  |  |  |  |
Anadarko Petroleum Corporation | Line of Credit | Term Loan Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument issued | $ 4,400,000,000 |  |  |  |  |  |  |  |
Debt instrument, term | 2 years |  |  |  |  |  |  |  |

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