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Directors’ and key management personnel remuneration - Additional information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
director
Dec. 31, 2023
USD ($)
director
Dec. 31, 2022
USD ($)
director
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration, including pension contributions $ 17,141 $ 16,227 $ 11,427
Aggregate pension contribution to defined contribution plans 186 155 174
Other employment costs 2,316 1,321 1,173
– Rio Tinto plc      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration, including pension contributions 16,185 15,184 10,692
Aggregate pension contribution to defined contribution plans 26 20 10
– Rio Tinto Limited      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration, including pension contributions 956 1,043 735
Aggregate pension contribution to defined contribution plans $ 0 $ 0 $ 0
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