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Label Element Value
Purchase Of Entity Shares Pursuant To Share Buy Back rio_PurchaseOfEntitySharesPursuantToShareBuyBack $ 1,444,000,000
Increase (decrease) due to changes in accounting policy required by IFRSs [member]  
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 169,000,000 [1]
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 115,000,000 [2]
Equity attributable to owners of parent [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]  
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 169,000,000 [1]
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 113,000,000 [2]
Other reserves [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]  
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards (10,000,000) [1]
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 0 [2]
Non-controlling interests [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]  
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 0 [1]
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 2,000,000 [2]
Retained earnings [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]  
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards 179,000,000 [1]
Adjustment For Transition To New Accounting Standards rio_AdjustmentForTransitionToNewAccountingStandards $ 113,000,000 [2]
[1] {F|ag9lfndlYmZpbGluZ3MtZXVyagsSBlhNTERvYyJeWEJSTERvY0dlbkluZm86NjdjOTA4NmJjOWJkNGYwN2JmNTM0NTk2NjZmZDc3ZDd8VGV4dFNlbGVjdGlvbjo2REM0NjI3QjYzQUVDOTA3MkFBMTQ5MzQ3REM0NzcxQQw}
[2] The impact of transition to new accounting standards; IFRS 16 ‘Leases’ and IFRIC 23 'Uncertainty over Income Tax Treatments' on 1 January 2019 is discussed on pages F-26 to F-30.