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Directors' and key management remuneration - Additional information (Detail)
 12 Months Ended
Dec. 31, 2020
USD ($)
Director
Dec. 31, 2019
USD ($)
Director
Dec. 31, 2018
USD ($)
Director
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration incurred $ 59,797,000 $ 40,494,000 $ 39,592,000
Aggregate pension contribution to defined contribution plans 369,000 477,000 629,000
Other employment costs $ 2,130,000 $ 2,066,000 $ 2,360,000
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 3
Rio Tinto plc      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate remuneration incurred $ 14,983,000 $ 11,565,000 $ 11,465,000
Aggregate pension contribution to defined contribution plans 29,000 42,000 80,000
Rio Tinto Limited      
Disclosure Of Directors And Key Management Remuneration [Line Items]      
Aggregate pension contribution to defined contribution plans 0 0 0
Aggregate remuneration including pension contributions and other retirement benefits $ 707,000 $ 749,000 $ 607,000