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THE ACQUISITION - PRO FORMA INFORMATION (Details) - Anadarko Petroleum Corporation - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Revenues | $ 28,723 | $ 31,206
Net income (loss) attributable to common stockholders | $ (769) | $ 2,965
Net income (loss) attributable to common stockholders per share—basic (usd per share) | $ (0.95) | $ 3.26
Net income (loss) attributable to common stockholders per share—diluted (usd per share) | $ (0.95) | $ 3.25
Net income (loss) attributable to common stockholders excluding pro-forma results of WES | $ (1,100) | $ 2,800

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