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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

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