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Financial instruments disclosures - Summary of borrowings in a hedge relationship (Details) - Interest rate risk - Borrowings in a Hedge Relationship - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Rio Tinto Finance plc Euro Bonds 2.875% due 2024 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | $ 546 |
Carrying value | 530 | $ 555
Rio Tinto Finance (USA) Limited Bonds 3.75% 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 1,200 |
Carrying value | 1,268 | 1,299
Rio Tinto Finance (USA) Limited Bonds 7.125% 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 750 |
Carrying value | 960 | 1,005
Alcan Inc. Debentures 7.25% due 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 100 |
Carrying value | 107 | 109
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 807 |
Carrying value | 713 | 717
Alcan Inc. Debentures 7.25% due 2031 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 400 |
Carrying value | 427 | 438
Alcan Inc. Global Notes 6.125% due 2033 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 750 |
Carrying value | 732 | 744
Alcan Inc. Global Notes 5.75% due 2035 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 300 |
Carrying value | 287 | 292
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 1,150 |
Carrying value | 1,168 | 1,173
Rio Tinto Finance (USA) plc Bonds 4.75% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 500 |
Carrying value | 500 | 501
Rio Tinto Finance (USA) plc Bonds 4.125% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 750 |
Carrying value | $ 742 | $ 743
Fixed interest rate | Rio Tinto Finance plc Euro Bonds 2.875% due 2024 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 2.875% |
Fixed interest rate | Rio Tinto Finance (USA) Limited Bonds 3.75% 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 3.75% |
Fixed interest rate | Rio Tinto Finance (USA) Limited Bonds 7.125% 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 7.125% |
Fixed interest rate | Alcan Inc. Debentures 7.25% due 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 7.25% |
Fixed interest rate | Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 4.00% |
Fixed interest rate | Alcan Inc. Debentures 7.25% due 2031 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 7.25% |
Fixed interest rate | Alcan Inc. Global Notes 6.125% due 2033 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 6.125% |
Fixed interest rate | Alcan Inc. Global Notes 5.75% due 2035 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 5.75% |
Fixed interest rate | Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 5.20% |
Fixed interest rate | Rio Tinto Finance (USA) plc Bonds 4.75% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 4.75% |
Fixed interest rate | Rio Tinto Finance (USA) plc Bonds 4.125% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, interest rate | 4.125% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance plc Euro Bonds 2.875% due 2024 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 1.64% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance (USA) Limited Bonds 3.75% 2025 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 1.39% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance (USA) Limited Bonds 7.125% 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 3.27% |
3 Month LIBOR, plus basis spread | Alcan Inc. Debentures 7.25% due 2028 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 5.43% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 2.65% |
3 Month LIBOR, plus basis spread | Alcan Inc. Debentures 7.25% due 2031 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 5.72% |
3 Month LIBOR, plus basis spread | Alcan Inc. Global Notes 6.125% due 2033 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 5.67% |
3 Month LIBOR, plus basis spread | Alcan Inc. Global Notes 5.75% due 2035 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 5.18% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 3.79% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance (USA) plc Bonds 4.75% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 3.42% |
3 Month LIBOR, plus basis spread | Rio Tinto Finance (USA) plc Bonds 4.125% 2042 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Weighted average interest rate after swaps | 2.83% |

X
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