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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing $ 12,440 $ 14,624
Current borrowings including overdrafts 312 552
Total borrowings $ 12,752 $ 15,176
Rio Tinto Finance plc Euro Bonds 2.0% due 2020 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 2.00% 2.00%
Borrowing maturity 2020 2020
Non-current borrowing $ 468 $ 921
Total borrowings $ 468 $ 921
Rio Tinto Finance (USA) Limited Bonds 4.125% 2021 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 4.125% 4.125%
Borrowing maturity 2021 2021
Non-current borrowing   $ 428
Total borrowings   $ 428
Rio Tinto Finance (USA) Limited Bonds 3.750% 2021 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.75% 3.75%
Borrowing maturity 2021 2021
Non-current borrowing   $ 347
Total borrowings   $ 347
Rio Tinto Finance (USA) plc Bonds 3.5% 2022 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.50% 3.50%
Borrowing maturity 2022 2022
Non-current borrowing   $ 227
Total borrowings   $ 227
Rio Tinto Finance (USA) plc Bonds 2.875% 2022 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 2.875% 2.875%
Borrowing maturity 2022 2022
Non-current borrowing   $ 377
Total borrowings   $ 377
Rio Tinto Finance plc Euro Bonds 2.875% due 2024 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 2.875% 2.875%
Borrowing maturity 2024 2024
Non-current borrowing $ 514 $ 644
Total borrowings $ 514 $ 644
Rio Tinto Finance (USA) Limited Bonds 3.75% 2025 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.75% 3.75%
Borrowing maturity 2025 2025
Non-current borrowing $ 1,170 $ 1,192
Total borrowings $ 1,170 $ 1,192
Rio Tinto Finance (USA) Limited Bonds 7.125% 2028 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 7.125% 7.125%
Borrowing maturity 2028 2028
Non-current borrowing $ 927 $ 965
Total borrowings $ 927 $ 965
Alcan Inc. Debentures 7.25% due 2028 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 7.25% 7.25%
Borrowing maturity 2028 2028
Non-current borrowing $ 104 $ 105
Total borrowings $ 104 $ 105
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 4.00% 4.00%
Borrowing maturity 2029 2029
Non-current borrowing $ 633 $ 669
Total borrowings $ 633 $ 669
Alcan Inc. Debentures 7.25% due 2031 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 7.25% 7.25%
Borrowing maturity 2031 2031
Non-current borrowing $ 421 $ 422
Total borrowings $ 421 $ 422
Alcan Inc. Global Notes 6.125% due 2033 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 6.125% 6.125%
Borrowing maturity 2033 2033
Non-current borrowing $ 741 $ 740
Total borrowings $ 741 $ 740
Alcan Inc. Global Notes 5.75% due 2035 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 5.75% 5.75%
Borrowing maturity 2035 2035
Non-current borrowing $ 288 $ 287
Total borrowings $ 288 $ 287
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 5.20% 5.20%
Borrowing maturity 2040 2040
Non-current borrowing $ 1,095 $ 1,102
Total borrowings $ 1,095 $ 1,102
Rio Tinto Finance (USA) plc Bonds 4.75% 2042 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 4.75% 4.75%
Borrowing maturity 2042 2042
Non-current borrowing $ 462 $ 467
Total borrowings $ 462 $ 467
Oyu Tolgoi LLC MIGA Insured Loan LIBOR plus 2.65% due 2027 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 2.65% 2.65%
Borrowing maturity 2027 2027
Non-current borrowing $ 676 $ 674
Total borrowings $ 676 $ 674
Rio Tinto Finance (USA) plc Bonds 4.125% 2042 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 4.125% 4.125%
Borrowing maturity 2042 2042
Non-current borrowing $ 685 $ 691
Total borrowings $ 685 $ 691
Oyu Tolgoi LLC Commercial Banks "B Loan" LIBOR plus 3.4% due 2027 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.40% 3.40%
Borrowing maturity 2027 2027
Non-current borrowing $ 1,588 $ 1,588
Total borrowings $ 1,588 $ 1,588
Oyu Tolgoi LLC Export Credit Agencies Loan 2.3% due 2028 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 2.30% 2.30%
Borrowing maturity 2028 2028
Non-current borrowing $ 272 $ 255
Total borrowings $ 272 $ 255
Oyu Tolgoi LLC Export Credit Agencies Loan LIBOR plus 3.65% due 2029 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.65% 3.65%
Borrowing maturity 2029 2029
Non-current borrowing $ 871 $ 869
Total borrowings $ 871 $ 869
Oyu Tolgoi LLC International Financial Instritutions "A Loan" LIBOR plus 3.78% due 2030 [member]    
Disclosure of detailed information about borrowings [Line Items]    
Borrowings, interest rate 3.78% 3.78%
Borrowing maturity 2030 2030
Non-current borrowing $ 768 $ 761
Total borrowings 768 761
Loans from equity accounted units [member]    
Disclosure of detailed information about borrowings [Line Items]    
Current borrowings including overdrafts   31
Total borrowings   31
Other secured loans [member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 345 451
Current borrowings including overdrafts 42 79
Total borrowings 387 530
Other unsecured loans [member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 373 393
Current borrowings including overdrafts 264 435
Total borrowings 637 828
Finance leases [member]    
Disclosure of detailed information about borrowings [Line Items]    
Non-current borrowing 39 49
Current borrowings including overdrafts 5 4
Total borrowings 44 53
Bank overdrafts [member]    
Disclosure of detailed information about borrowings [Line Items]    
Current borrowings including overdrafts 1 3
Total borrowings $ 1 $ 3