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Contingencies and commitments (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Commitments And Contingent Liabilities [Abstract]

		2017		2016
	US$m		US$m
Capital commitments excluding the Group's share of joint venture capital commitments
Within 1 year		2,052		1,588
Between 1 and 3 years		531		433
Between 3 and 5 years		58		194
After 5 years		-		15
Total		2,641		2,230

Group's share of joint venture capital commitments
Within 1 year		29		113
Total		29		113

Summary of aggregate amount of minimum lease payments under non-cancellable operating leases

The aggregate amount of minimum lease payments under non-cancellable operating leases are as follows:

			Adjusted ^(a)
		2017		2016
	US$m		US$m
Within 1 year		397		331
Between 1 and 3 years		542		463
Between 3 and 5 years		313		314
After 5 years		593		612
		1,845		1,720

Summary of aggregate amount of future payment commitments under purchase obligations outstanding

The aggregate amount of future payment commitments under purchase obligations outstanding at 31 December was:

			Adjusted ^(a)
		2017		2016
	US$m		US$m
Within 1 year		2,818		2,677
Between 1 and 2 years		1,664		1,711
Between 2 and 3 years		1,433		1,327
Between 3 and 4 years		1,318		1,207
Between 4 and 5 years		1,062		1,040
After 5 years		11,494		11,356
		19,789		19,318

Summary of subsidiaries and joint operations contingent liabilities

(a)

Indemnities and other performance guarantees represent the potential outflow of funds from the Group for the satisfaction of obligations including those under contractual arrangements (for example undertakings related to supplier agreements) not provided for in the balance sheet, where the likelihood of the guarantees or indemnities being called is assessed as possible rather than probable or remote.

(b)	There were no material contingent liabilities arising in relation to the Group’s joint ventures and associates.

Contingent liabilities (subsidiaries and joint operations)

Indemnities and other performance guarantees^{(a) (b)}