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Capitalised finance leases - Summary of capitalised finance leases (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]
Total minimum lease payments undiscounted	$ 45	$ 57
Effect of discounting	(1)	(4)
Total	44	53
Due within 1 year [member]
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]
Present value of minimum lease payments	5	4
Between 1 and 3 years [member]
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]
Present value of minimum lease payments	10	14
Between 3 and 5 years [member]
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]
Present value of minimum lease payments	18	28
More than 5 years [member]
Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]
Present value of minimum lease payments	$ 12	$ 11

X

- Definition

The amount of the discounted unguaranteed residual value of assets subject to finance leases. Unguaranteed residual value is the portion of the residual value of the underlying asset, the realisation of which by a lessor is not assured or is guaranteed solely by a party related to the lessor. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2017-01-01
-Paragraph 94
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_94&doctype=Standard
-URIDate 2017-03-09

+ Details

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X

- Definition

The amount of contractual undiscounted cash flows in relation to finance lease obligations before deducting finance charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Expiry date 2019-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph B11D
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_B11D_a&doctype=Appendix&seq=2&book=B
-URIDate 2017-03-09

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X

- Definition

The amount of payments over the finance 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 any amounts guaranteed by the lessee or by a party related to the lessee.

+ 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 31
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_b&doctype=Standard&book=B
-URIDate 2017-03-09

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X

- Definition

The present value of minimum finance lease payments payable. [Refer: Minimum finance lease payments payable]

+ 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 31
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_b&doctype=Standard&book=B
-URIDate 2017-03-09

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- Definition

Disclosure Of Maturity Analysis Of Finance Lease Payments Payable [Line Items]

+ References

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