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Share-based payments - Additional information (Detail) | 12 Months Ended |
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Dec. 31, 2019 USD ($) Option Instrument shares | Dec. 31, 2018 USD ($) Option shares | Dec. 31, 2019 £ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of cancellations employees electing to withdraw their investment shares before vesting of their matching shares | 15.00% |  |
Options outstanding, number of options | Option | 0 | 40,114 |
Aggregate Intrinsic Value Of Outstanding Share Options |  | $ 1,000,000 |
Liability for cash-settled awards | $ 19,000,000 | $ 16,000,000 |
Rio Tinto plc [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of share-based payment charge for plan | 100.00% | 100.00% |
Rio Tinto Limited [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of share-based payment charge for plan | 100.00% | 100.00% |
Performance share plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of forfeitures, prior to vesting, on outstanding awards | 5.00% | 5.00% |
Description of vesting requirements for share-based payment arrangement | Forfeitures prior to vesting are assumed at 5% per annum of outstanding awards (2017: 5% per annum). |  |
Number of global mining comparators | Instrument | 10 |  |
Performance share plans [member] | Rio Tinto plc [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled awards outstanding | shares | 49,019 |  |
Liability for cash-settled awards | $ 13,000,000 |  |
Performance share plans [member] | Rio Tinto plc [Member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled awards outstanding | shares |  | 40,365 |
Liability for cash-settled awards |  | $ 11,000,000 |
Performance share plans [member] | Rio Tinto Limited [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled awards outstanding | shares | 276,722 | 276,722 |
Management share plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of forfeitures, prior to vesting, on outstanding awards | 7.00% | 7.00% |
Description of vesting requirements for share-based payment arrangement | The vesting of these awards is dependent on service conditions being met. |  |
Bonus deferral plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Description of method of settlement for share-based payment arrangement | 0.03 | 0.03 |
Description of vesting requirements for share-based payment arrangement | The vesting of these awards is dependent only on service conditions being met. |  |
Global employee share plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of forfeitures, prior to vesting, on outstanding awards | 5.00% | 5.00% |
Description of vesting requirements for share-based payment arrangement | The vesting of these matching awards is dependent on service conditions being met and the continued holding of investment shares by the participant until vesting. |  |
Share Incentive Plans [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Liability for cash-settled awards | $ 6,000,000 |  |
Share Incentive Plans [Member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Liability for cash-settled awards |  | $ 5,000,000 |
Share Incentive Plans [Member] | Rio Tinto plc [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled awards outstanding | shares | 52,881 | 46,543 |
Share Incentive Plans [Member] | Rio Tinto Limited [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Cash-settled awards outstanding | shares | 81,050 | 83,092 |
Executive Directors And Product Group Executives [Member] | Bonus deferral plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Description of method of settlement for share-based payment arrangement | 0.5 |  |
Description of vesting requirements for share-based payment arrangement | 50% of the bonuses |  |
Other Executives [Member] | Bonus deferral plans [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Description of method of settlement for share-based payment arrangement | 0.25 |  |
Ranges Of Exercise Prices For Outstanding Share Options Three [Member] | Share Option Plan [Member] | Rio Tinto plc [Member] | Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | £ / shares |  |  | £ 16
Ranges Of Exercise Prices For Outstanding Share Options Three [Member] | Share Option Plan [Member] | Rio Tinto plc [Member] | Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | £ / shares |  |  | 25
Ranges Of Exercise Prices For Outstanding Share Options Four [Member] | Share Option Plan [Member] | Rio Tinto Limited [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of outstanding share options | £ / shares |  |  | £ 33

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