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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 28, 2021
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [Line Items]      
Non-current borrowing   $ 12,395 $ 13,247
Current borrowings   1,136 584
Total borrowings   13,531 13,831
Notional amount   1,377 1,522
Cumulative amount utilised from debt issuance   1,100 1,200
Carrying value of bonds   1,200 $ 1,300
Buy-back of bonds   1,200  
Increase in stated percentage     1.00%
Debt instrument restrictive covenants   4,400 $ 4,500
European debt issuance programme      
Disclosure of detailed information about borrowings [Line Items]      
Notional amount   $ 10,000 10,000
Rio Tinto Finance plc Euro Bonds 2.875% due 2024      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   2.875%  
Non-current borrowing   $ 497 555
Current borrowings   0 0
Total borrowings   $ 497 555
Rio Tinto Finance (USA) Limited Bonds 3.75% 2025      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate 3.75% 3.75%  
Non-current borrowing   $ 0 1,299
Current borrowings   0 0
Total borrowings   $ 0 1,299
Buy-back of bonds $ 1,200    
Rio Tinto Finance (USA) Limited Bonds 7.125% 2028      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   7.125%  
Non-current borrowing   $ 934 1,005
Current borrowings   0 0
Total borrowings   $ 934 1,005
Alcan Inc. Debentures 7.25% due 2028      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   7.25%  
Non-current borrowing   $ 105 109
Current borrowings   0 0
Total borrowings   $ 105 109
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   4.00%  
Non-current borrowing   $ 682 717
Current borrowings   0 0
Total borrowings   $ 682 717
Alcan Inc. Debentures 7.25% due 2031      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   7.25%  
Non-current borrowing   $ 420 438
Current borrowings   0 0
Total borrowings   $ 420 438
Alcan Inc. Global Notes 6.125% due 2033      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   6.125%  
Non-current borrowing   $ 722 744
Current borrowings   0 0
Total borrowings   $ 722 744
Alcan Inc. Global Notes 5.75% due 2035      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   5.75%  
Non-current borrowing   $ 283 292
Current borrowings   0 0
Total borrowings   $ 283 292
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   5.20%  
Non-current borrowing   $ 1,156 1,173
Current borrowings   0 0
Total borrowings   $ 1,156 1,173
Rio Tinto Finance (USA) plc Bonds 4.75% 2042      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   4.75%  
Non-current borrowing   $ 495 501
Current borrowings   0 0
Total borrowings   $ 495 501
Rio Tinto Finance (USA) plc Bonds 4.125% 2042      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate   4.125%  
Non-current borrowing   $ 735 743
Current borrowings   0 0
Total borrowings   $ 735 743
Rio Tinto Finance (USA) plc Bonds 2.75% 2051      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate 2.75% 2.75%  
Non-current borrowing   $ 1,225 0
Current borrowings   0 0
Total borrowings $ 1,250 $ 1,225 0
Rio Tinto Finance (USA) plc Bonds 2.75% 2051 | Fixed interest rate      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings term 30 years    
Oyu Tolgoi LLC MIGA Insured Loan LIBOR plus 2.65% due 2027      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate basis   2.65%  
Non-current borrowing   $ 597 674
Current borrowings   76 4
Total borrowings   $ 673 678
Oyu Tolgoi LLC Commercial Banks, B Loan LIBOR plus 3.4% due 2027      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate basis   3.40%  
Non-current borrowing   $ 1,387 1,571
Current borrowings   178 10
Total borrowings   $ 1,565 1,581
Oyu Tolgoi LLC Export Credit Agencies Loan 2.3% due 2028      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate basis   2.30%  
Non-current borrowing   $ 237 275
Current borrowings   41 2
Total borrowings   $ 278 277
Oyu Tolgoi LLC Export Credit Agencies Loan LIBOR plus 3.65% due 2029      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate basis   3.65%  
Non-current borrowing   $ 805 867
Current borrowings   61 5
Total borrowings   $ 866 872
Oyu Tolgoi LLC International Financial Instritutions, A Loan, LIBOR plus 3.78% due 2030      
Disclosure of detailed information about borrowings [Line Items]      
Borrowings, interest rate basis   3.78%  
Non-current borrowing   $ 744 771
Current borrowings   32 6
Total borrowings   776 777
Other secured loans      
Disclosure of detailed information about borrowings [Line Items]      
Non-current borrowing   0 246
Current borrowings   246 68
Total borrowings   246 314
Other unsecured loans      
Disclosure of detailed information about borrowings [Line Items]      
Non-current borrowing   332 322
Current borrowings   176 256
Total borrowings   508 578
Lease liabilities      
Disclosure of detailed information about borrowings [Line Items]      
Non-current borrowing   1,039 945
Current borrowings   324 233
Total borrowings   1,363 1,178
Bank overdrafts      
Disclosure of detailed information about borrowings [Line Items]      
Non-current borrowing   0 0
Current borrowings   2 0
Total borrowings   $ 2 $ 0