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Contingencies and commitments (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Commitments And Contingent Liabilities [Abstract] |
Summary of capital commitments |
| 2019 US$m |  | 2018 US$m |
Capital commitments excluding the Group's share of joint venture capital commitments |  |
Within 1 year | 3,069 |  | 1,742 |
Between 1 and 3 years | 851 |  | 439 |
Between 3 and 5 years | 133 |  | 66 |
After 5 years | — |  | 36 |
Total | 4,053 |  | 2,283 |
Group's share of joint venture capital commitments |  |
Within 1 year | 92 |  | 115 |
Between 1 and 3 years | 1 |  | 1 |
Total | 93 |  | 116 |
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 at 31 December 2018, prepared and reported under IAS 17 “Leases”, were as follows:
| 2018 US$m |
Within 1 year | 475 |
Between 1 and 3 years | 587 |
Between 3 and 5 years | 270 |
After 5 years | 385 |
Total(a) | 1,717 |
(a) Operating leases included leases of dry bulk vessels and offices as well as other property, plant and equipment. Leases for dry bulk vessels included costs for crewing services.
Summary of aggregate amount of future payment commitments under purchase obligations outstanding | The aggregate amount of future payment commitments under purchase obligations outstanding at 31 December was:
| 2019 US$m |  | 2018 US$m |
Within 1 year | 2,920 |  | 2,804 |
Between 1 and 2 years | 1,705 |  | 1,565 |
Between 2 and 3 years | 1,431 |  | 1,344 |
Between 3 and 4 years | 1,084 |  | 1,097 |
Between 4 and 5 years | 1,082 |  | 882 |
After 5 years | 8,697 |  | 9,358 |
Total | 16,919 |  | 17,050 |
Summary of indemnities and other performance guarantees |
| 2019 US$m |  | 2018 US$m |
Indemnities and other performance guarantees(a)(b) | 204 |  | 317 |
(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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