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Segmental information - Summary of performance of operating segments (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of operating segments [line items]    
Consolidated sales revenue $ 29,775 $ 33,083
Underlying EBITDA 15,597 21,037
Underlying earnings 8,627 12,166
– attributable to owners of Rio Tinto (net earnings) 8,908 12,313
Proceeds from disposal of property, plant and equipment 1 26
Consolidated sales revenue/Capital expenditure 3,146 3,336
Other Operations    
Disclosure of operating segments [line items]    
Consolidated sales revenue 107 85
Underlying EBITDA (78) (4)
Underlying earnings (167) (51)
Capital expenditure 9 0
Product group    
Disclosure of operating segments [line items]    
Consolidated sales revenue 31,314 34,628
Underlying EBITDA 15,928 21,420
Underlying earnings 8,804 12,466
Capital expenditure 3,297 3,395
Other items    
Disclosure of operating segments [line items]    
Capital expenditure 41 35
Share of equity accounted units    
Disclosure of operating segments [line items]    
Share of equity accounted units (1,539) (1,545)
Capital expenditure (193) (120)
Central pension costs, share-based payments & insurance & derivatives    
Disclosure of operating segments [line items]    
Underlying EBITDA 265 119
– attributable to owners of Rio Tinto (net earnings) 237 120
Restructuring, project and one-off costs    
Disclosure of operating segments [line items]    
Underlying EBITDA (86) (36)
– attributable to owners of Rio Tinto (net earnings) (61) (23)
Central costs    
Disclosure of operating segments [line items]    
Underlying EBITDA (397) (346)
– attributable to owners of Rio Tinto (net earnings) (363) (294)
Central exploration and evaluation    
Disclosure of operating segments [line items]    
Underlying EBITDA (113) (120)
– attributable to owners of Rio Tinto (net earnings) (95) (100)
Net interest    
Disclosure of operating segments [line items]    
– attributable to owners of Rio Tinto (net earnings) 105 (3)
Underlying earnings    
Disclosure of operating segments [line items]    
– attributable to owners of Rio Tinto (net earnings) 8,627 12,166
Operating segments | Reportable segments    
Disclosure of operating segments [line items]    
Consolidated sales revenue 31,356 34,688
Underlying EBITDA 16,007 21,430
Underlying earnings 8,971 12,520
Capital expenditure 3,288 3,395
Operating segments | Iron Ore    
Disclosure of operating segments [line items]    
Consolidated sales revenue 16,610 21,707
Underlying EBITDA 10,395 16,060
Underlying earnings 6,461 10,216
Capital expenditure 1,472 1,912
Operating segments | Aluminium    
Disclosure of operating segments [line items]    
Consolidated sales revenue 7,796 5,932
Underlying EBITDA 2,866 1,924
Underlying earnings 1,547 921
Capital expenditure 681 524
Operating segments | Copper    
Disclosure of operating segments [line items]    
Consolidated sales revenue 3,547 3,779
Underlying EBITDA 1,487 2,048
Underlying earnings 543 885
Capital expenditure 867 750
Operating segments | Minerals    
Disclosure of operating segments [line items]    
Consolidated sales revenue 3,403 3,270
Underlying EBITDA 1,259 1,398
Underlying earnings 420 498
Capital expenditure 268 209
Inter-segment transactions    
Disclosure of operating segments [line items]    
Consolidated sales revenue (149) (145)
Underlying EBITDA (1) (6)
Underlying earnings $ 0 $ (3)