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DIVESTITURES AND ACQUISITIONS - Other (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Purchase price | $ 518 |  |
Other upstream acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  | $ 6 | $ 39
ARO liabilities assumed |  |  | $ 1

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