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Contingencies and commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Commitments And Contingent Liabilities [Abstract] |
Summary of capital commitments |
|  | 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 |
|  | 2017 |  |  | 2016 |
| US$m |  | US$m |
Contingent liabilities (subsidiaries and joint operations) |  |  |  |  |  |
Indemnities and other performance guarantees (a) (b) |  | 552 |  |  | 473 |
(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.

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- Definition The disclosure of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2016-01-13 -Paragraph 86 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2016-03-30&anchor=para_86&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The disclosure of a maturity analysis of operating lease payments. Operating lease is a lease that does not transfer 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 2016-01-13 -Paragraph 97 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2016-03-30&anchor=para_97&doctype=Standard -URIDate 2016-03-31 + Details
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