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Provisions and other liabilities - Expected timing of cash outflows (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 21,603 | $ 25,216
2022 - 2026 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,194 |
2027 - 2031 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,896 |
2032 - 2036 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,563 |
2037 - 2041 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 6,207 |
Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,742 |
Asset retirement obligations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 17,417 | 20,128
Asset retirement obligations [Member] | 2022 - 2026 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,180 |
Asset retirement obligations [Member] | 2027 - 2031 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 1,597 |
Asset retirement obligations [Member] | 2032 - 2036 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,315 |
Asset retirement obligations [Member] | 2037 - 2041 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 6,152 |
Asset retirement obligations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,173 |
Other provisions, including claims and litigations [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 4,186 |
Other provisions, including claims and litigations [Member] | 2022 - 2026 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 3,014 |
Other provisions, including claims and litigations [Member] | 2027 - 2031 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 299 |
Other provisions, including claims and litigations [Member] | 2032 - 2036 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 248 |
Other provisions, including claims and litigations [Member] | 2037 - 2041 [member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | 55 |
Other provisions, including claims and litigations [Member] | Thereafter [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision | $ 569 |
Onerous contracts, cancellation fees and other [Member] |  |
Disclosure of other provisions and other liabilities [line items] |  |
Total provision |  | $ 166

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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 2021-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_d&doctype=Standard -URIDate 2021-03-24 + Details
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