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Share of profit after tax of equity accounted units (Tables)
 12 Months Ended
Dec. 31, 2021
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]  
Summary of share of profit after tax of equity accounted units
Rio Tinto share
2021
US$m
2020
US$m
2019
US$m
Sales revenue(a)
3,181 2,490 2,358 
Operating costs(1,435)(1,439)(1,812)
Profit before finance items and taxation1,746 1,051 546 
Finance items(58)(59)(65)
Share of profit after tax of equity accounted units13 23 10 
Profit before taxation1,701 1,015 491 
Taxation(659)(363)(190)
Profit for the year1,042 652 301 
(a) Sales revenue of equity accounted units includes sales by equity accounted units to Group subsidiaries.