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Provisions and other liabilities - Expected timing of cash outflows (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 22,380 | $ 19,163
KrasGeoNaC [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Contingent consideration | $ 145 |
Proportion of voting rights held in associate | 49.00% |
2021 - 2025 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 5,080 |
2026 - 2030 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,900 |
2031 - 2035 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 5,895 |
2036 - 2040 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 2,598 |
Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 6,908 |
Asset retirement obligations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 17,292 | $ 14,719
Asset retirement obligations [Member] | 2021 - 2025 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 883 |
Asset retirement obligations [Member] | 2026 - 2030 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,634 |
Asset retirement obligations [Member] | 2031 - 2035 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 5,716 |
Asset retirement obligations [Member] | 2036 - 2040 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 2,557 |
Asset retirement obligations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 6,502 |
Other provisions, including claims and litigations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 5,089 |
Other provisions, including claims and litigations [Member] | 2021 - 2025 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,197 |
Other provisions, including claims and litigations [Member] | 2026 - 2030 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 266 |
Other provisions, including claims and litigations [Member] | 2031 - 2035 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 178 |
Other provisions, including claims and litigations [Member] | 2036 - 2040 [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 41 |
Other provisions, including claims and litigations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 406 |
Onerous contracts, cancellation fees and other [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 166 |

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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B -URIDate 2019-03-27 + 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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- Definition The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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