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Contingencies and commitments (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Commitments And Contingent Liabilities [Abstract]

		2018		2017
	US$m		US$m
Capital commitments excluding the Group's share of joint venture capital commitments
Within 1 year		1,742		2,052
Between 1 and 3 years		439		531
Between 3 and 5 years		66		58
After 5 years		36		-
Total		2,283		2,641

Group's share of joint venture capital commitments
Within 1 year		115		29
Between 1 and 3 years		1		-
Total		116		29

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

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

		2018		2017
	US$m		US$m
Within 1 year		475		397
Between 1 and 3 years		587		542
Between 3 and 5 years		270		313
After 5 years		385		593
Total		1,717		1,845

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

			Adjusted ^(a)
	2018		2017
	US$m		US$m
Within 1 year		2,804		2,874
Between 1 and 2 years		1,565		1,712
Between 2 and 3 years		1,344		1,401
Between 3 and 4 years		1,097		1,282
Between 4 and 5 years		882		1,026
After 5 years		9,358		11,185
Total		17,050		19,480

(a)The 2017 comparative has been amended to correctly reflect certain purchase obligations at 31 December 2017. The impact is a reduction in future payment commitments of US$309 million.

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)}