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Other operating items - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Loss on impairment of long-lived assets | $ 152 | $ 1,230
Gain on disposal relating to the disputed West Mira BOP | 11 | $ 0
PT Duta Marina |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Fair value of consideration received | 7 |
West Mira BOP |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain on disposal relating to the disputed West Mira BOP | $ 4 |

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