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Intangible assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | $ 8,149 | $ 10,738 |
Expensed exploration expenditures previously capitalised |  | (171) | (2,506) | $ (777)
Intangibles ending | $ 8,149 | 6,452 | 8,149 | 10,738
Exploration And Production USA [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Net reversal of impairment loss |  | $ 2 |  |
Minimum [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangible assets with finite useful lives |  | 3 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 |  | $ 8,505 | 11,033 |
Additions through business combinations |  | 116 |  |
Additions |  | 262 | 492 |
Disposals at cost |  | (53) | (8) |
Transfers |  | (1,730) | (89) |
Expensed exploration expenditures previously capitalised |  | (171) | (2,506) |
Impairment of goodwill |  | (1) | (42) |
Assets reclassified to held for sale |  |  | (499) |
Effect of changes in foreign exchange |  | (111) | 123 |
Intangibles ending | 8,505 | 6,816 | 8,505 | 11,033
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | (356) | (295) |
Amortisation and impairments for the year |  | (24) | (35) |
Assets reclassified to held for sale |  |  | (17) |
Amortisation and impairment losses disposed intangible assets |  | 13 | (6) |
Effect of changes in foreign exchange |  | 3 | (3) |
Intangibles ending | (356) | (364) | (356) | (295)
Exploration expenses [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 2,261 |  |
Intangibles ending | 2,261 | 1,958 | 2,261 |
Impairments, intangible assets |  | 154 |  |
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] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 2,261 | 3,014 |
Additions through business combinations |  | 0 |  |
Additions |  | 191 | 401 |
Disposals at cost |  | (22) | (7) |
Transfers |  | (432) | (16) |
Expensed exploration expenditures previously capitalised |  | (19) | (1,169) |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  |  | 0 |
Effect of changes in foreign exchange |  | (21) | 38 |
Intangibles ending | 2,261 | 1,958 | 2,261 | 3,014
Acquisition costs related to oil and gas prospects [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 3,932 |  |
Intangibles ending | 3,932 | 2,670 | 3,932 |
Impairments, intangible assets |  | 152 |  |
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 |  | 3,932 | 5,599 |
Additions through business combinations |  | 0 |  |
Additions |  | 36 | 67 |
Disposals at cost |  | 1 | 0 |
Transfers |  | (1,137) | (73) |
Expensed exploration expenditures previously capitalised |  | (152) | (1,337) |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  |  | (339) |
Effect of changes in foreign exchange |  | (10) | 16 |
Intangibles ending | 3,932 | 2,670 | 3,932 | 5,599
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 1,481 |  |
Intangibles ending | 1,481 | 1,467 | 1,481 |
Goodwill [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 1,481 | 1,458 |
Additions through business combinations |  | 61 |  |
Additions |  | 0 | 0 |
Disposals at cost |  | (3) | 0 |
Transfers |  | 0 | 0 |
Expensed exploration expenditures previously capitalised |  | 0 | 0 |
Impairment of goodwill |  | (1) | (42) |
Assets reclassified to held for sale |  |  | 0 |
Effect of changes in foreign exchange |  | (70) | 64 |
Intangibles ending | 1,481 | 1,467 | 1,481 | 1,458
Goodwill [member] | Cost [member] | Exploration and Production Norway [Member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Goodwill related to business acquired in 2019 | 615 |  | 615 |
Goodwill [member] | Cost [member] | 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 | 435 |  | 435 |
Other intangible assets [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 475 |  |
Intangibles ending | 475 | 358 | 475 |
Other intangible assets [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | 831 | 962 |
Additions through business combinations |  | 55 |  |
Additions |  | 35 | 24 |
Disposals at cost |  | (29) | 0 |
Transfers |  | (161) | 0 |
Expensed exploration expenditures previously capitalised |  | 0 | 0 |
Impairment of goodwill |  | 0 | 0 |
Assets reclassified to held for sale |  |  | (160) |
Effect of changes in foreign exchange |  | (10) | 6 |
Intangibles ending | 831 | 722 | 831 | 962
Other intangible assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Intangibles beginning |  | (356) | (295) |
Amortisation and impairments for the year |  | (24) | 35 |
Assets reclassified to held for sale |  |  | (17) |
Amortisation and impairment losses disposed intangible assets |  | 13 | (6) |
Effect of changes in foreign exchange |  | 3 | (3) |
Intangibles ending | (356) | $ (364) | (356) | $ (295)
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 |
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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