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Borrowings - Summary of borrowings (Detail) € in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 11, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 11, 2024 EUR (€) | Nov. 30, 2024
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 12,442 | $ 13,001 |  |  |
Current borrowings |  | 180 | 824 |  |  |
Non-current borrowings |  | 12,262 | 12,177 |  |  |
Nominal value of hedged item |  | 890 | 1,050 |  |  |
Repayments of borrowings |  | 860 | 310 | $ 790 |  |
Cumulative amount utilised from debt issuance |  | 626 | 1,102 |  |  |
Carrying value of bonds |  | $ 624 | 1,063 |  |  |
Increase in stated percentage |  | 1.20% |  |  |  |
Debt instrument restrictive covenants |  | $ 3,945 | 3,994 |  |  |
European debt issuance programme |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | 10,000 | 10,000 |  |  |
Rio Tinto Finance plc Euro Bonds 2.875% due 2024 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 0 | 452 |  |  |
Nominal value of hedged item | € |  |  |  |  | € 417 |
Repayments of borrowings | $ 546 |  |  |  |  |
Rio Tinto Finance plc Euro Bonds 2.875% due 2024 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 2.875% |  |  |  |
Nominal value of hedged item |  | $ 0 | 463 |  |  |
Rio Tinto Finance (USA) Limited Bonds 7.125% due 2028 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 780 | 804 |  |  |
Rio Tinto Finance (USA) Limited Bonds 7.125% due 2028 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 7.125% |  |  |  |
Nominal value of hedged item |  | $ 750 | 750 |  |  |
Effective exchange rate |  | 3.54% |  |  |  |
Alcan Inc. Debentures 7.25% due 2028 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 101 | 99 |  |  |
Alcan Inc. Debentures 7.25% due 2028 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 7.25% |  |  |  |
Nominal value of hedged item |  | $ 100 | 100 |  |  |
Effective exchange rate |  | 3.33% |  |  |  | 5.69%
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 624 | 611 |  |  |
Rio Tinto Finance plc Sterling Bonds 4.0% due 2029 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 4.00% |  |  |  |
Nominal value of hedged item |  | $ 0 | 639 |  |  |
Alcan Inc. Debentures 7.25% due 2031 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 402 | 392 |  |  |
Alcan Inc. Debentures 7.25% due 2031 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 7.25% |  |  |  |
Nominal value of hedged item |  | $ 400 | 400 |  |  |
Effective exchange rate |  | 5.98% |  |  |  |
Rio Tinto Finance (USA) plc Bonds 5.0% due 2033 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 646 | 646 |  |  |
Rio Tinto Finance (USA) plc Bonds 5.0% due 2033 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 5.00% |  |  |  |
Nominal value of hedged item |  | $ 650 | 0 |  |  |
Effective exchange rate |  | 0.96% |  |  |  |
Alcan Inc. Global Notes 6.125% due 2033 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 731 | 699 |  |  |
Alcan Inc. Global Notes 6.125% due 2033 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 6.125% |  |  |  |
Nominal value of hedged item |  | $ 750 | 750 |  |  |
Effective exchange rate |  | 5.93% |  |  |  |
Alcan Inc. Global Notes 5.75% due 2035 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 287 | 274 |  |  |
Alcan Inc. Global Notes 5.75% due 2035 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 5.75% |  |  |  |
Nominal value of hedged item |  | $ 300 | 300 |  |  |
Effective exchange rate |  | 5.44% |  |  |  |
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 1,142 | 1,158 |  |  |
Rio Tinto Finance (USA) Limited Bonds 5.2% 2040 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 5.20% |  |  |  |
Nominal value of hedged item |  | $ 1,150 | 200 |  |  |
Effective exchange rate |  | 1.18% |  |  |  |
Rio Tinto Finance (USA) plc Bonds 4.75% due 2042 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 492 | 492 |  |  |
Rio Tinto Finance (USA) plc Bonds 4.75% due 2042 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 4.75% |  |  |  |
Nominal value of hedged item |  | $ 500 | 0 |  |  |
Effective exchange rate |  | 0.65% |  |  |  |
Rio Tinto Finance (USA) plc Bonds 4.125% due 2042 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 732 | 731 |  |  |
Rio Tinto Finance (USA) plc Bonds 4.125% due 2042 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 4.125% |  |  |  |
Nominal value of hedged item |  | $ 0 | 0 |  |  |
Rio Tinto Finance (USA) Limited Bonds 2.75% due 2051 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 1,103 | 1,098 |  |  |
Rio Tinto Finance (USA) Limited Bonds 2.75% due 2051 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 2.75% |  |  |  |
Nominal value of hedged item |  | $ 1,250 | 1,250 |  |  |
Effective exchange rate |  | 1.57% |  |  |  |
Rio Tinto Finance (USA) plc Bonds 5.125% due 2053 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 1,097 | 1,151 |  |  |
Rio Tinto Finance (USA) plc Bonds 5.125% due 2053 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 5.125% |  |  |  |
Nominal value of hedged item |  | $ 1,100 | 1,100 |  |  |
Effective exchange rate |  | 0.76% |  |  |  |
Oyu Tolgoi LLC MIGA Insured Loan SOFR plus 2.65% due 2032 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis |  | 2.65% |  |  |  |
Total borrowings |  | $ 603 | 602 |  |  |
Oyu Tolgoi LLC MIGA Insured Loan SOFR plus 2.65% due 2032 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | $ 0 | 0 |  |  |
Oyu Tolgoi LLC Commercial Banks "B Loan" SOFR plus 3.4% due 2032 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis |  | 3.40% |  |  |  |
Total borrowings |  | $ 1,392 | 1,392 |  |  |
Oyu Tolgoi LLC Commercial Banks "B Loan" SOFR plus 3.4% due 2032 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | $ 0 | 0 |  |  |
Oyu Tolgoi LLC Export Credit Agencies Loan 4.72% due 2033 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate |  | 4.72% |  |  |  |
Total borrowings |  | $ 249 | 248 |  |  |
Oyu Tolgoi LLC Export Credit Agencies Loan 4.72% due 2033 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | $ 0 | 0 |  |  |
Oyu Tolgoi LLC Export Credit Agencies Loan SOFR plus 3.65% due 2034 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis |  | 3.65% |  |  |  |
Total borrowings |  | $ 816 | 816 |  |  |
Oyu Tolgoi LLC Export Credit Agencies Loan SOFR plus 3.65% due 2034 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | $ 0 | 0 |  |  |
Oyu Tolgoi LLC International Financial Institutions "A Loan" SOFR plus 3.78% due 2035 |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Borrowings, interest rate basis |  | 3.78% |  |  |  |
Total borrowings |  | $ 792 | 792 |  |  |
Oyu Tolgoi LLC International Financial Institutions "A Loan" SOFR plus 3.78% due 2035 | Borrowings in a hedge relationship | Interest rate risk |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Nominal value of hedged item |  | 0 | 0 |  |  |
Other secured loans |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | 93 | 144 |  |  |
Other unsecured loans |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | 349 | 399 |  |  |
Bank overdrafts |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |
Total borrowings |  | $ 11 | $ 1 |  |  |

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