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Capitalised finance leases (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Capitalised Finance Leases [Abstract]

Summary of capitalised finance leases

					2018			2017
	Note			US$m			US$m
Present value of minimum lease payments
Total minimum lease payments					45			57
Effect of discounting					(1	)		(4	)
Total		22			44			53

Payments under capitalised finance leases
Due within 1 year					5			4
Between 1 and 3 years					10			14
Between 3 and 5 years					18			28
More than 5 years					12			11
Total					45			57