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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 13,247 $ 13,093
Current borrowings 584 1,022
Total borrowings 13,831 14,115
Rio Tinto Finance plc Euro Bonds 2.0% due 2020    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 0 0
Current borrowings 0 455
Total borrowings $ 0 455
Borrowings, interest rate 2.00%  
Rio Tinto Finance plc Euro Bonds 2.875% due 2024    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 555 508
Current borrowings 0 0
Total borrowings $ 555 508
Borrowings, interest rate 2.875%  
Rio Tinto Finance (USA) Limited Bonds 3.75% 2025    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,299 1,229
Current borrowings 0 0
Total borrowings $ 1,299 1,229
Borrowings, interest rate 3.75%  
Rio Tinto Finance (USA) Limited Bonds 7.125% 2028    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,005 958
Current borrowings 0 0
Total borrowings $ 1,005 958
Borrowings, interest rate 7.125%  
Alcan Inc. Debentures 7.25% due 2028    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 109 104
Current borrowings 0 0
Total borrowings $ 109 104
Borrowings, interest rate 7.25%  
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 717 647
Current borrowings 0 0
Total borrowings $ 717 647
Borrowings, interest rate 4.00%  
Alcan Inc. Debentures 7.25% due 2031    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 438 419
Current borrowings 0 0
Total borrowings $ 438 419
Borrowings, interest rate 7.25%  
Alcan Inc. Global Notes 6.125% due 2033    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 744 742
Current borrowings 0 0
Total borrowings $ 744 742
Borrowings, interest rate 6.125%  
Alcan Inc. Global Notes 5.75% due 2035    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 292 289
Current borrowings 0 0
Total borrowings $ 292 289
Borrowings, interest rate 5.75%  
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,173 1,137
Current borrowings 0 0
Total borrowings $ 1,173 1,137
Borrowings, interest rate 5.20%  
Rio Tinto Finance (USA) plc Bonds 4.75% 2042    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 501 483
Current borrowings 0 0
Total borrowings $ 501 483
Borrowings, interest rate 4.75%  
Rio Tinto Finance (USA) plc Bonds 4.125% 2042    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 743 716
Current borrowings 0 0
Total borrowings $ 743 716
Borrowings, interest rate 4.125%  
Oyu Tolgoi LLC MIGA Insured Loan LIBOR plus 2.65% due 2027    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 674 676
Current borrowings 4 3
Total borrowings $ 678 679
Borrowings, interest rate 2.65%  
Oyu Tolgoi LLC Commercial Banks, B Loan LIBOR plus 3.4% due 2027    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,571 1,581
Current borrowings 10 8
Total borrowings $ 1,581 1,589
Borrowings, interest rate 3.40%  
Oyu Tolgoi LLC Export Credit Agencies Loan 2.3% due 2028    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 275 273
Current borrowings 2 3
Total borrowings $ 277 276
Borrowings, interest rate 2.30%  
Oyu Tolgoi LLC Export Credit Agencies Loan LIBOR plus 3.65% due 2029    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 867 869
Current borrowings 5 5
Total borrowings $ 872 874
Borrowings, interest rate 3.65%  
Oyu Tolgoi LLC International Financial Instritutions, A Loan, LIBOR plus 3.78% due 2030    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 771 771
Current borrowings 6 4
Total borrowings $ 777 775
Borrowings, interest rate 3.78%  
Other secured loans    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 246 302
Current borrowings 68 45
Total borrowings 314 347
Other unsecured loans    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 322 382
Current borrowings 256 197
Total borrowings 578 579
Lease liabilities    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 945 1,007
Current borrowings 233 302
Total borrowings $ 1,178 $ 1,309