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Share-based payments - Additional information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
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%  
Liability for cash-settled awards $ 7 $ 6
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%
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%
Performance 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%
Performance share plans | Rio Tinto Limited    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 23,917 27,476
Performance share plans | Rio Tinto plc    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 26,394  
Liability for cash-settled awards $ 2  
Performance share plans | Rio Tinto plc | Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding   20,548
Liability for cash-settled awards   $ 2
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 Plan    
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 $ 5  
Share incentive plan | Top of range    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Liability for cash-settled awards   $ 4
Share incentive plan | Rio Tinto Limited    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 9,685 12,217
Share incentive plan | Rio Tinto plc    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Cash-settled awards outstanding 90,748 89,239