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Right-of-use assets and Lease liabilities - Components of Right-of-Use Assets (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | $ 266 | $ 279 | $ 79
Property, plant & equipment | 2,887 |  | 2,800
Right-of-use assets, revaluation surplus |  | 3 |
Lease liability in excess of capital |  | 10 |
Previously stated [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Property, plant & equipment |  |  | $ 79
Land [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 21 | 20 |
Buildings [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 217 | 226 |
Machinery & equipment and other assets [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | $ 28 | $ 33 |

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- Definition Lease Liability In Excess Of Capital Asset + References No definition available. + Details
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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 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + 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 -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_j&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of the revaluation surplus that relates to right-of-use assets. [Refer: Revaluation surplus; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 57 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_57&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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- Details
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