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Property, plant and equipment Property, plant and equipment - Summary of owned and leased assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Property, plant and equipment [abstract] |  |  |  |
Property, Plant and Equipment, Owned | $ 56,307 |  | $ 56,330 |
Property, plant and equipment – owned | 56,307 |  | 56,361 | $ 62,093
Right of use assets – leased | 1,065 | $ 1,022 | 0 |
Finance leases under IAS 17 | 0 |  | 31 |
Net book value | $ 57,372 |  |  |
Net book value |  |  | $ 56,361 |

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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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Balance Type: | debit
Period Type: | instant

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- 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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- Definition Finance Leases + References No definition available. + Details
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- Definition Property, Plant and Equipment And Right Of Use Assets, Lease + References No definition available. + Details
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- Definition Property, Plant and Equipment, Net + References No definition available. + Details
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- Definition Property, Plant and Equipment, Owned + References No definition available. + Details
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