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Borrowings - Summary of borrowings (Detail)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 11, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 11, 2024
EUR (€)
Nov. 30, 2024
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 12,442 $ 13,001      
Current borrowings   180 824      
Non-current borrowings   12,262 12,177      
Nominal value of hedged item   890 1,050      
Repayments of borrowings   860 310 $ 790    
Cumulative amount utilised from debt issuance   626 1,102      
Carrying value of bonds   $ 624 1,063      
Increase in stated percentage   1.20%        
Debt instrument restrictive covenants   $ 3,945 3,994      
European debt issuance programme            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   10,000 10,000      
Rio Tinto Finance plc Euro Bonds 2.875% due 2024            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 0 452      
Nominal value of hedged item | €         € 417  
Repayments of borrowings $ 546          
Rio Tinto Finance plc Euro Bonds 2.875% due 2024 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   2.875%        
Nominal value of hedged item   $ 0 463      
Rio Tinto Finance (USA) Limited Bonds 7.125% due 2028            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 780 804      
Rio Tinto Finance (USA) Limited Bonds 7.125% due 2028 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   7.125%        
Nominal value of hedged item   $ 750 750      
Effective exchange rate   3.54%        
Alcan Inc. Debentures 7.25% due 2028            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 101 99      
Alcan Inc. Debentures 7.25% due 2028 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   7.25%        
Nominal value of hedged item   $ 100 100      
Effective exchange rate   3.33%       5.69%
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 624 611      
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   4.00%        
Nominal value of hedged item   $ 0 639      
Alcan Inc. Debentures 7.25% due 2031            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 402 392      
Alcan Inc. Debentures 7.25% due 2031 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   7.25%        
Nominal value of hedged item   $ 400 400      
Effective exchange rate   5.98%        
Rio Tinto Finance (USA) plc Bonds 5.0% due 2033            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 646 646      
Rio Tinto Finance (USA) plc Bonds 5.0% due 2033 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   5.00%        
Nominal value of hedged item   $ 650 0      
Effective exchange rate   0.96%        
Alcan Inc. Global Notes 6.125% due 2033            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 731 699      
Alcan Inc. Global Notes 6.125% due 2033 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   6.125%        
Nominal value of hedged item   $ 750 750      
Effective exchange rate   5.93%        
Alcan Inc. Global Notes 5.75% due 2035            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 287 274      
Alcan Inc. Global Notes 5.75% due 2035 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   5.75%        
Nominal value of hedged item   $ 300 300      
Effective exchange rate   5.44%        
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 1,142 1,158      
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   5.20%        
Nominal value of hedged item   $ 1,150 200      
Effective exchange rate   1.18%        
Rio Tinto Finance (USA) plc Bonds 4.75% due 2042            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 492 492      
Rio Tinto Finance (USA) plc Bonds 4.75% due 2042 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   4.75%        
Nominal value of hedged item   $ 500 0      
Effective exchange rate   0.65%        
Rio Tinto Finance (USA) plc Bonds 4.125% due 2042            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 732 731      
Rio Tinto Finance (USA) plc Bonds 4.125% due 2042 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   4.125%        
Nominal value of hedged item   $ 0 0      
Rio Tinto Finance (USA) Limited Bonds 2.75% due 2051            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 1,103 1,098      
Rio Tinto Finance (USA) Limited Bonds 2.75% due 2051 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   2.75%        
Nominal value of hedged item   $ 1,250 1,250      
Effective exchange rate   1.57%        
Rio Tinto Finance (USA) plc Bonds 5.125% due 2053            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 1,097 1,151      
Rio Tinto Finance (USA) plc Bonds 5.125% due 2053 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   5.125%        
Nominal value of hedged item   $ 1,100 1,100      
Effective exchange rate   0.76%        
Oyu Tolgoi LLC MIGA Insured Loan SOFR plus 2.65% due 2032            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate basis   2.65%        
Total borrowings   $ 603 602      
Oyu Tolgoi LLC MIGA Insured Loan SOFR plus 2.65% due 2032 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   $ 0 0      
Oyu Tolgoi LLC Commercial Banks "B Loan" SOFR plus 3.4% due 2032            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate basis   3.40%        
Total borrowings   $ 1,392 1,392      
Oyu Tolgoi LLC Commercial Banks "B Loan" SOFR plus 3.4% due 2032 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   $ 0 0      
Oyu Tolgoi LLC Export Credit Agencies Loan 4.72% due 2033            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate   4.72%        
Total borrowings   $ 249 248      
Oyu Tolgoi LLC Export Credit Agencies Loan 4.72% due 2033 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   $ 0 0      
Oyu Tolgoi LLC Export Credit Agencies Loan SOFR plus 3.65% due 2034            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate basis   3.65%        
Total borrowings   $ 816 816      
Oyu Tolgoi LLC Export Credit Agencies Loan SOFR plus 3.65% due 2034 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   $ 0 0      
Oyu Tolgoi LLC International Financial Institutions "A Loan" SOFR plus 3.78% due 2035            
Disclosure of detailed information about borrowings [Line Items]            
Borrowings, interest rate basis   3.78%        
Total borrowings   $ 792 792      
Oyu Tolgoi LLC International Financial Institutions "A Loan" SOFR plus 3.78% due 2035 | Borrowings in a hedge relationship | Interest rate risk            
Disclosure of detailed information about borrowings [Line Items]            
Nominal value of hedged item   0 0      
Other secured loans            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   93 144      
Other unsecured loans            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   349 399      
Bank overdrafts            
Disclosure of detailed information about borrowings [Line Items]            
Total borrowings   $ 11 $ 1