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Share-based payments - Additional information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of cancellations employees electing to withdraw their investment shares before vesting of their matching shares 15.00%  
Percentage of cancellations employees electing to withdraw their investment shares before vesting of their matching shares, per annum 5.00%  
Liability for cash-settled awards $ 5 $ 6
– Rio Tinto plc    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of share-based payment charge for plan 100.00% 100.00%
– Rio Tinto Limited    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of share-based payment charge for plan 100.00% 100.00%
Performance share plans    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Performance condition 80.00%  
Decarbonisation measure 20.00%  
Percentage of forfeitures, prior to vesting, on outstanding awards 5.00% 5.00%
Performance share plans | – Rio Tinto plc    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 41,164 24,365
Liability for cash-settled awards $ 1 $ 1
Performance share plans | – Rio Tinto Limited    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 25,792 19,881
Management share awards    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of forfeitures, prior to vesting, on outstanding awards 7.00% 7.00%
Bonus Deferral Awards    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of forfeitures, prior to vesting, on outstanding awards 3.00% 3.00%
Bonus Deferral Awards | Executive Directors And Product Group Executives    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of bonus deferral 50.00%  
Global Employee Share Plans    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Percentage of forfeitures, prior to vesting, on outstanding awards 5.00% 5.00%
Share incentive plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Liability for cash-settled awards $ 4 $ 5
Share incentive plan | – Rio Tinto plc    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 88,637 90,331
Share incentive plan | – Rio Tinto Limited    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 5,232 7,913