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Provisions and other liabilities - Expected timing of cash outflows (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 19,163 | $ 16,175
2020 - 2024 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,529 |
2025-2029 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,904 |
2030 - 2034 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,686 |
2035 - 2039 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,875 |
Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 5,168 |
Asset retirement obligations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 14,719 | $ 12,609
Asset retirement obligations [Member] | 2020 - 2024 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,410 |
Asset retirement obligations [Member] | 2025-2029 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,247 |
Asset retirement obligations [Member] | 2030 - 2034 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,605 |
Asset retirement obligations [Member] | 2035 - 2039 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,719 |
Asset retirement obligations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,738 |
Other provisions, including claims and litigations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,443 |
Other provisions, including claims and litigations [Member] | 2020 - 2024 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,119 |
Other provisions, including claims and litigations [Member] | 2025-2029 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 657 |
Other provisions, including claims and litigations [Member] | 2030 - 2034 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 81 |
Other provisions, including claims and litigations [Member] | 2035 - 2039 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 156 |
Other provisions, including claims and litigations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 430 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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