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ACQUISITIONS, DIVESTITURES AND OTHER TRANSACTIONS - PRO FORMA INFORMATION (Details) - Anadarko Petroleum Corporation $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenues | $ 28,723
Net loss attributable to common stockholders | $ (769)
Net loss attributable to common stockholders per share—basic (in dollars per share) | $ / shares | $ (0.95)
Net loss attributable to common stockholders per share—diluted (in dollars per share) | $ / shares | $ (0.95)
Net loss attributable to common stockholders excluding pro-forma results of WES | $ (1,100)

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