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Capitalised finance leases (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Capitalised Finance Leases [Abstract]

Summary of capitalised finance leases

					2017			2016
	Note			US$m			US$m
Present value of minimum lease payments
Total minimum lease payments					57			45
Effect of discounting					(4	)		-
		22			53			45

Payments under capitalised finance leases
Due within 1 year					4			21
Between 1 and 3 years					14			8
Between 3 and 5 years					28			6
More than 5 years					11			10
					57			45