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Significant accounting policies (Details 2) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 08, 2019 | Jan. 01, 2019
--- | --- | --- | --- | ---
Non-current assets [abstract] |  |  |  |
Property, plant and equipment | $ 12,263 | $ 12,069 |  |
Right-of-use assets | 1,676 | 1,677 |  | $ 1,554
Equity [abstract] |  |  |  |
Reserves | 55,738 | 54,618 |  |
Current liabilities [abstract] |  |  |  |
Current lease liabilities | $ 286 | $ 246 |  |
Increase (decrease) due to changes in accounting policy, IFRS 16 [member] |  |  |  |
Non-current assets [abstract] |  |  |  |
Property, plant and equipment |  |  |  | (101)
Equity [abstract] |  |  |  |
Reserves |  |  |  | 3
Current liabilities [abstract] |  |  |  |
Current lease liabilities |  |  |  | 268
Discontinued operations [member] |  |  |  |
Non-current assets [abstract] |  |  |  |
Property, plant and equipment |  |  | $ 2,858 |
Right-of-use assets |  |  | $ 269 | 276
Discontinued operations [member] | Previously stated [member] |  |  |  |
Non-current assets [abstract] |  |  |  |
Right-of-use assets |  |  |  | $ 75

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- Definition The amount of current lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- References No definition available. + Details
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- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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