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The Merger - Pro Forma Information (Details) - Anadarko - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 7,335 | $ 8,913 | $ 22,419 | $ 23,095
Net income (loss) attributable to common stockholders | $ (427) | $ 2,060 | $ 475 | $ 3,405
Net income (loss) attributable to common stockholders per share—basic (in usd per share) | $ (0.50) | $ 2.27 | $ 0.51 | $ 3.74
Net income (loss) attributable to common stockholders per share—diluted (in usd per share) | $ (0.50) | $ 2.26 | $ 0.50 | $ 3.73

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