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Lease liability and Right-of-use assets (Details 2) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | $ 1,676 | $ 1,677 | $ 1,554
Depreciation charge | (330) | (305) |
Land [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 528 | 537 |
Depreciation charge | (11) | (14) |
Buildings [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 963 | 990 |
Depreciation charge | (207) | (194) |
Vehicles [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 155 | 129 |
Depreciation charge | (100) | (87) |
Machinery & equipment and other assets |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 30 | 21 |
Depreciation charge | $ (12) | $ (10) |

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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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 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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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |