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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 13,093 $ 12,440
Current borrowings 1,022 312
Total borrowings 14,115 12,752
Rio Tinto Finance plc Euro Bonds 2.0% due 2020 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 0 468
Current borrowings 455  
Total borrowings $ 455 $ 468
Borrowings, interest rate 2.00% 2.00%
Borrowing maturity 2020 2020
Rio Tinto Finance plc Euro Bonds 2.875% due 2024 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 508 $ 514
Total borrowings $ 508 $ 514
Borrowings, interest rate 2.875% 2.875%
Borrowing maturity 2024 2024
Rio Tinto Finance (USA) Limited Bonds 3.75% 2025 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,229 $ 1,170
Total borrowings $ 1,229 $ 1,170
Borrowings, interest rate 3.75% 3.75%
Borrowing maturity 2025 2025
Rio Tinto Finance (USA) Limited Bonds 7.125% 2028 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 958 $ 927
Total borrowings $ 958 $ 927
Borrowings, interest rate 7.125% 7.125%
Borrowing maturity 2028 2028
Alcan Inc. Debentures 7.25% due 2028 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 104 $ 104
Total borrowings $ 104 $ 104
Borrowings, interest rate 7.25% 7.25%
Borrowing maturity 2028 2028
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 647 $ 633
Total borrowings $ 647 $ 633
Borrowings, interest rate 4.00% 4.00%
Borrowing maturity 2029 2029
Alcan Inc. Debentures 7.25% due 2031 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 419 $ 421
Total borrowings $ 419 $ 421
Borrowings, interest rate 7.25% 7.25%
Borrowing maturity 2031 2031
Alcan Inc. Global Notes 6.125% due 2033 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 742 $ 741
Total borrowings $ 742 $ 741
Borrowings, interest rate 6.125% 6.125%
Borrowing maturity 2033 2033
Alcan Inc. Global Notes 5.75% due 2035 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 289 $ 288
Total borrowings $ 289 $ 288
Borrowings, interest rate 5.75% 5.75%
Borrowing maturity 2035 2035
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,137 $ 1,095
Total borrowings $ 1,137 $ 1,095
Borrowings, interest rate 5.20% 5.20%
Borrowing maturity 2040 2040
Rio Tinto Finance (USA) plc Bonds 4.75% 2042 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 483 $ 462
Total borrowings $ 483 $ 462
Borrowings, interest rate 4.75% 4.75%
Borrowing maturity 2042 2042
Rio Tinto Finance (USA) plc Bonds 4.125% 2042 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 716 $ 685
Total borrowings $ 716 $ 685
Borrowings, interest rate 4.125% 4.125%
Borrowing maturity 2042 2042
Oyu Tolgoi LLC MIGA Insured Loan LIBOR plus 2.65% due 2027 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 676 $ 676
Current borrowings 3  
Total borrowings $ 679 $ 676
Borrowings, interest rate 2.65% 2.65%
Borrowing maturity 2027 2027
Oyu Tolgoi LLC Commercial Banks, B Loan LIBOR plus 3.4% due 2027 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 1,581 $ 1,588
Current borrowings 8  
Total borrowings $ 1,589 $ 1,588
Borrowings, interest rate 3.40% 3.40%
Borrowing maturity 2027 2027
Oyu Tolgoi LLC Export Credit Agencies Loan 2.3% due 2028 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 273 $ 272
Current borrowings 3  
Total borrowings $ 276 $ 272
Borrowings, interest rate 2.30% 2.30%
Borrowing maturity 2028 2028
Oyu Tolgoi LLC Export Credit Agencies Loan LIBOR plus 3.65% due 2029 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 869 $ 871
Current borrowings 5  
Total borrowings $ 874 $ 871
Borrowings, interest rate 3.65% 3.65%
Borrowing maturity 2029 2029
Oyu Tolgoi LLC International Financial Instritutions, A Loan, LIBOR plus 3.78% due 2030 [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 771 $ 768
Current borrowings 4  
Total borrowings $ 775 $ 768
Borrowings, interest rate 3.78% 3.78%
Borrowing maturity 2030 2030
Other secured loans [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 302 $ 345
Current borrowings 45 42
Total borrowings 347 387
Other unsecured loans [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 382 373
Current borrowings 197 264
Total borrowings 579 637
Lease liabilities [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 1,007 39
Current borrowings 302 5
Total borrowings 1,309 44
Bank overdrafts [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Current borrowings 0 1
Total borrowings $ 0 $ 1