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Share of profit after tax of equity accounted units
 12 Months Ended
Dec. 31, 2020
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]  
Share of profit after tax of equity accounted units
7 Share of profit after tax of equity accounted units
2020
US$m
2019
US$m
2018
US$m
Sales revenue: Rio Tinto share(a)
2,490 2,358 2,497 
Operating costs(1,439)(1,812)(1,656)
Profit before finance items and taxation1,051 546 841 
Finance items(59)(65)(69)
Share of profit after tax of equity accounted units23 10 14 
Profit before taxation1,015 491 786 
Taxation(363)(190)(273)
Profit for the year (Rio Tinto share)652 301 513 

(a) Sales revenue of equity accounted units includes sales by equity accounted units to Group subsidiaries.
Further information relating to the Group’s interests in joint ventures and associates is given in notes 34 and 35.