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Intangible assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | $ 10,738 |  |
Expensed exploration expenditures previously capitalised |  | (2,506) | $ (777) | $ (357)
Intangibles ending | $ 8,148 | 8,148 | 10,738 |
Exploration and Production Norway [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill related to business acquired in 2019 | 678 | 678 |  |
Marketing, Midstream and Processing (MMP) [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill related to business acquired in 2019 | 472 | $ 472 |  |
Minimum [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangible assets with finite useful lives |  | 10 years |  |
Maximum [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangible assets with finite useful lives |  | 20 years |  |
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | $ 11,033 | 9,901 |
Additions through business combinations |  | 0 | 1,080 |
Additions |  | 491 | 1,571 |
Disposals at cost |  | (8) | (367) |
Transfers |  | (89) | (213) |
Expensed exploration expenditures previously capitalised |  | (2,506) | (777) |
Impairment of goodwill |  | (42) | (164) |
Assets reclassified to held for sale |  | (499) | 0 |
Effect of changes in foreign exchange |  | 123 | 3 |
Intangibles ending | 8,504 | 8,504 | 11,033 | 9,901
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | (295) | (229) |
Amortisation and impairments for the year |  | (35) | (60) |
Assets reclassified to held for sale |  | 17 |  |
Amortisation and impairment losses disposed intangible assets |  | (6) | (6) |
Effect of changes in foreign exchange |  | (3) | 1 |
Intangibles ending | (356) | (356) | (295) | (229)
Exploration expenses [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 3,014 |  |
Intangibles ending | 2,260 | 2,260 | 3,014 |
Exploration expenses [Member] | Dry wells and uncommercial discoveries and unconventional onshore assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairments, intangible assets |  | 657 |  |
Exploration expenses [Member] | Europe and Asia and Sub Sahara areas [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairments, intangible assets |  |  | 49 |
Exploration expenses [Member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 3,014 | 2,685 |
Additions through business combinations |  | 0 | 0 |
Additions |  | 400 | 515 |
Disposals at cost |  | (7) | (7) |
Transfers |  | (16) | (71) |
Expensed exploration expenditures previously capitalised |  | (1,169) | (120) |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  | 0 | 0 |
Effect of changes in foreign exchange |  | 38 | 11 |
Intangibles ending | 2,260 | 2,260 | 3,014 | 2,685
Acquisition costs related to oil and gas prospects [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 5,599 |  |
Intangibles ending | 3,932 | 3,932 | 5,599 |
Acquisition costs related to oil and gas prospects [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 5,599 | 5,854 |
Additions through business combinations |  | 0 | 0 |
Additions |  | 67 | 900 |
Disposals at cost |  | 0 | (361) |
Transfers |  | (73) | (143) |
Expensed exploration expenditures previously capitalised |  | (1,337) | (657) |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  | (339) | 0 |
Effect of changes in foreign exchange |  | 16 | 5 |
Intangibles ending | 3,932 | 3,932 | 5,599 | 5,854
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 1,458 |  |
Intangibles ending | 1,481 | 1,481 | 1,458 |
Goodwill [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 1,458 | 565 |
Additions through business combinations |  | 0 | 1,070 |
Additions |  | 0 | 0 |
Disposals at cost |  | 0 | 0 |
Transfers |  | 0 | 0 |
Expensed exploration expenditures previously capitalised |  | 0 | 0 |
Impairment of goodwill |  | (42) | (164) |
Assets reclassified to held for sale |  | 0 | 0 |
Effect of changes in foreign exchange |  | 64 | (12) |
Intangibles ending | 1,481 | 1,481 | 1,458 | 565
Other intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 667 |  |
Intangibles ending | 475 | 475 | 667 |
Impairments, intangible assets |  |  | 41 |
Other intangible assets [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 962 | 797 |
Additions through business combinations |  | 0 | 10 |
Additions |  | 24 | 155 |
Disposals at cost |  | 0 | 0 |
Transfers |  | 0 | 0 |
Expensed exploration expenditures previously capitalised |  | 0 | 0 |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  | (160) | 0 |
Effect of changes in foreign exchange |  | 6 | (1) |
Intangibles ending | 831 | 831 | 962 | 797
Other intangible assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | (295) | (229) |
Amortisation and impairments for the year |  | (35) | 60 |
Assets reclassified to held for sale |  | 17 |  |
Amortisation and impairment losses disposed intangible assets |  | (6) | (6) |
Effect of changes in foreign exchange |  | (3) | 1 |
Intangibles ending | (356) | (356) | (295) | $ (229)
Signature bonuses and acquisition costs [Member] | Unconventional assets [Member] | Exploration And Production USA [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairments, intangible assets |  | $ 680 | $ 608 |
Capitalised well costs [member] | Tanzania [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Impairments, intangible assets | $ 982 |  |  |

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