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Contingencies and commitments - Summary of aggregate amount of minimum lease payments under non-cancellable operating leases (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Aggregate amount of minimum lease payments under non-cancellable operating leases | $ 1,717 | $ 1,845
Due within 1 year [member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Aggregate amount of minimum lease payments under non-cancellable operating leases | 475 | 397
Between 1 and 3 years [member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Aggregate amount of minimum lease payments under non-cancellable operating leases | 587 | 542
Between 3 and 5 years [member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Aggregate amount of minimum lease payments under non-cancellable operating leases | 270 | 313
More than 5 years [member] |  |
Disclosure of finance lease and operating lease by lessee [Line Items] |  |
Aggregate amount of minimum lease payments under non-cancellable operating leases | $ 385 | $ 593

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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 future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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