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Contingencies and commitments (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Of Commitments And Contingent Liabilities [Abstract]  
Summary of capital commitments

2020
US$m
2019
US$m
Capital commitments excluding the Group's share of joint venture capital commitments
Within 1 year
3,021 3,069 
Between 1 and 3 years
97 851 
Between 3 and 5 years
— 133 
After 5 years
34 — 
Total3,152 4,053 

Group's share of joint venture capital commitments
Within 1 year
9 92 
Between 1 and 3 years
— 1 
Total
9 93 
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:

2020
US$m
2019
US$m
Within 1 year
3,100 2,920 
Between 1 and 2 years
1,715 1,705 
Between 2 and 3 years
1,291 1,431 
Between 3 and 4 years
1,242 1,084 
Between 4 and 5 years
848 1,082 
After 5 years
8,437 8,697 
Total
16,633 16,919 
Summary of indemnities and other performance guarantees
2020
US$m
2019
US$m
Indemnities and other performance guarantees(a)(b)
146 204 
(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.