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Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | $ 9,672 |  |
Expensed exploration expenditures previously capitalised | (777) | $ (357) | $ 8
Intangibles ending | $ 10,738 | 9,672 |
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 | $ 9,901 | 8,836 |
Additions through business combinations | 1,080 | 773 |
Additions | 1,571 | 1,302 |
Disposals at cost | (367) | (364) |
Increase (decrease) through transfers, intangible assets and goodwill | (213) | (161) |
Assets reclassified to held for sale | 0 | 0 |
Expensed exploration expenditures previously capitalised | (777) | (357) |
Impairment of goodwill | (164) |  |
Effect of changes in foreign exchange | 3 | (128) |
Intangibles ending | 11,033 | 9,901 | 8,836
Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | (229) | (215) |
Amortisation and impairments for the year | (60) | (13) |
Amortisation and impairment losses disposed intangible assets | (6) | (2) |
Effect of changes in foreign exchange | 1 | 1 |
Intangibles ending | (295) | (229) | (215)
Exploration expenses [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 2,685 |  |
Intangibles ending | 3,014 | 2,685 |
Impairments, intangible assets | 49 | 52 |
Exploration expenses [Member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 2,685 | 2,715 |
Additions through business combinations | 0 | 0 |
Additions | 515 | 392 |
Disposals at cost | (7) | (272) |
Increase (decrease) through transfers, intangible assets and goodwill | (71) | (13) |
Assets reclassified to held for sale | 0 | 0 |
Expensed exploration expenditures previously capitalised | (120) | (68) |
Impairment of goodwill | 0 |  |
Effect of changes in foreign exchange | 11 | (70) |
Intangibles ending | 3,014 | 2,685 | 2,715
Acquisition costs related to oil and gas prospects [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 5,854 |  |
Intangibles ending | 5,599 | 5,854 |
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 | 5,854 | 5,363 |
Additions through business combinations | 0 | 116 |
Additions | 900 | 917 |
Disposals at cost | (361) | (89) |
Increase (decrease) through transfers, intangible assets and goodwill | (143) | (148) |
Assets reclassified to held for sale | 0 | 0 |
Expensed exploration expenditures previously capitalised | (657) | (289) |
Impairment of goodwill | 0 |  |
Effect of changes in foreign exchange | 5 | (17) |
Intangibles ending | 5,599 | 5,854 | 5,363
Goodwill [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 565 |  |
Intangibles ending | 1,458 | 565 |
Goodwill [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 565 | 339 |
Additions through business combinations | 1,070 | 265 |
Additions | 0 | 0 |
Disposals at cost | 0 | 0 |
Increase (decrease) through transfers, intangible assets and goodwill | 0 | 0 |
Assets reclassified to held for sale | 0 | 0 |
Expensed exploration expenditures previously capitalised | 0 | 0 |
Impairment of goodwill | (164) |  |
Effect of changes in foreign exchange | (12) | (39) |
Intangibles ending | 1,458 | 565 | 339
Goodwill [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 0 | 0 |
Amortisation and impairments for the year | 0 | 0 |
Amortisation and impairment losses disposed intangible assets | 0 | 0 |
Effect of changes in foreign exchange | 0 | 0 |
Intangibles ending | 0 | 0 | 0
Other intangible assets [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 568 |  |
Intangibles ending | 667 | 568 |
Impairments, intangible assets | 41 |  |
Other intangible assets [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | 797 | 419 |
Additions through business combinations | 10 | 392 |
Additions | 155 | (7) |
Disposals at cost | 0 | (4) |
Increase (decrease) through transfers, intangible assets and goodwill | 0 | 0 |
Assets reclassified to held for sale | 0 | 0 |
Expensed exploration expenditures previously capitalised | 0 | 0 |
Impairment of goodwill | 0 |  |
Effect of changes in foreign exchange | (1) | (2) |
Intangibles ending | 962 | 797 | 419
Other intangible assets [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangibles beginning | (229) | (215) |
Amortisation and impairments for the year | (60) | (13) |
Amortisation and impairment losses disposed intangible assets | (6) | (2) |
Effect of changes in foreign exchange | 1 | 1 |
Intangibles ending | (295) | (229) | $ (215)
Signature bonuses and acquisition costs [Member] | North America [member] | Unconventional assets [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairments, intangible assets | $ 608 | $ 237 |

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