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Directors' and key management remuneration - Additional information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
director
Dec. 31, 2022
USD ($)
director
Dec. 31, 2021
USD ($)
director
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate pension contribution to defined contribution plans $ 155 $ 174 $ 300
Other employment costs $ 1,321 $ 1,173 $ 1,511
Defined Benefit Plan      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Number of directors accrued retirement benefits under defined contribution arrangements | director 0 0 0
Defined Contribution Plans      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Number of directors accrued retirement benefits under defined contribution arrangements | director 2 2 2
Rio Tinto plc      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration including pension contributions and other retirement benefits $ 15,184 $ 10,692 $ 7,522
Aggregate pension contribution to defined contribution plans 20 10 9
Rio Tinto Limited      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration including pension contributions and other retirement benefits 1,043 735 642
Aggregate pension contribution to defined contribution plans $ 0 $ 0 $ 0