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Income taxes - Reconciliation of statutory tax rate to effective tax rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Income/(loss) before tax | $ 9,292 | $ 18,874 | $ 13,420 |
Calculated income tax at statutory rate | (2,284) | (5,197) | (3,827) |
Calculated Norwegian Petroleum tax | (5,499) | (8,189) | (5,945) |
Tax effect uplift | 632 | 736 | 784 |
Tax effect of permanent differences regarding divestments | 380 | 400 | (85) |
Tax effect of permanent differences caused by functional currency different from tax currency | 8 | 116 | (229) |
Tax effect of other permanent differences | 395 | 337 | 291 |
Tax effect of dispute with Angolan Ministry of Finance | 0 | 0 | 496 |
Recognition of previously unrecognised deferred tax assets | 0 | 923 | 0 |
Change in unrecognised deferred tax assets | (974) | 72 | (169) |
Change in tax regulations | (6) | (28) | (14) |
Prior period adjustments | 47 | (148) | (224) |
Other items including currency effects | (139) | (357) | 100 |
Income tax expense | $ (7,441) | $ (11,335) | $ (8,822) |
Effective tax rate | 80.10% | 60.10% | 65.70% |
Statutory tax rate | 24.60% | 27.50% | 28.50% |
Unrecognised uplift credits | $ 1,678 | $ 1,780 |  |
Uplift rate, for investments subject to transitional rules | 7.50% |  |  |
Uplift rate | 5.20% | 5.30% | 5.40% | 5.50%
Norway [member] |  |  |  |
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Statutory tax rate | 22.00% | 23.00% | 24.00% |
Petroleum tax rate | 56.00% | 55.00% | 54.00% |
Development and Production International [Member] |  |  |  |
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Recognition of previously unrecognised deferred tax assets |  | $ 923 |  |

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- Definition Additional tax-free allowance rate or uplift rate for those invesments that are subject to transitional rules. . + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to additional tax free allowance. + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to unrecognised differed tax assets. + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to permanent differences. + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to prior period adjustments. + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to differences in foreign exchange between functional and tax currency. + References No definition available. + Details
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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_b_viii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 23 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_23_h&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_79&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 82 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_d&doctype=Standard -URIDate 2019-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_g&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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