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Income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |  |  |  |
Income/(loss) before tax | $ (720) | $ 81 | $ 3,520 | $ (640) | $ 8,401 | $ 9,292 |
Income tax | $ 469 | $ (786) | $ (2,045) | $ (316) | $ (5,213) | $ (7,441) | [1]
Effective tax rate | 65.20% |  | 58.10% | (49.50%) | 62.10% | 80.10% |
Minimum [member] |  |  |  |  |  |  |
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |  |  |  |
Effective tax rate |  | 100.00% |  |  |  |  |
[1] | Audited

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