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Rio Tinto financial information by business unit - Schedule of financial information by business unit (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of operating segments [line items]      
Consolidated sales revenue $ 33,083 $ 19,362  
EBITDA 17,993 5,929  
Impairment charges 0 (1,163)  
Depreciation and amortisation in subsidiaries excluding capitalised depreciation 2,253 1,974  
Finance items 56 (650)  
Profit before taxation 18,049 5,279  
Profit/(loss) after tax – attributable to owners of Rio Tinto 12,313 3,316  
Capital expenditure 3,310 2,665  
Add back: Proceeds from disposal of property, plant and equipment 26 28  
Capital expenditure 3,336 2,693  
Depreciation and amortisation expense 2,307 2,092  
Operating assets 49,835   $ 47,718
Less: Net cash/(debt) 3,140   (664)
Equity attributable to owners of Rio Tinto 52,975   47,054
Other operations      
Disclosure of operating segments [line items]      
Consolidated sales revenue 85 158  
Capital expenditure 0 1  
Depreciation and amortisation expense 92 99  
Product group      
Disclosure of operating segments [line items]      
Consolidated sales revenue 34,628 20,333  
EBITDA 21,420 10,004  
Profit/(loss) after tax – attributable to owners of Rio Tinto 12,466 5,022  
Capital expenditure 3,395 2,802  
Depreciation and amortisation expense 2,514 2,367  
Central pensions, share-based payments, insurance and derivatives      
Disclosure of operating segments [line items]      
EBITDA 119 102  
Profit/(loss) after tax – attributable to owners of Rio Tinto 120 97  
Restructuring, project and one-off costs      
Disclosure of operating segments [line items]      
EBITDA (36) (72)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (23) (53)  
Central costs      
Disclosure of operating segments [line items]      
EBITDA (346) (273)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (294) (233)  
Central exploration and evaluation      
Disclosure of operating segments [line items]      
EBITDA (120) (121)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (100) (97)  
Net interest      
Disclosure of operating segments [line items]      
Profit/(loss) after tax – attributable to owners of Rio Tinto (3) 14  
Underlying EBITDA/earnings      
Disclosure of operating segments [line items]      
EBITDA 21,037 9,640  
Profit/(loss) after tax – attributable to owners of Rio Tinto 12,166 4,750  
Items excluded from underlying EBITDA/earnings      
Disclosure of operating segments [line items]      
EBITDA (177) (119)  
Profit/(loss) after tax – attributable to owners of Rio Tinto 147 (1,434)  
Other items      
Disclosure of operating segments [line items]      
Capital expenditure 35 22  
Depreciation and amortisation expense 42 39  
Operating assets (1,224)   (2,165)
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales      
Disclosure of operating segments [line items]      
Share of equity accounted unit sales and intra-subsidiary/equity accounted unit sales (1,545) (971)  
Depreciation and amortisation in equity accounted units (249) (314)  
Taxation and finance items in equity accounted units (365) (141)  
Capital expenditure (120) (159)  
Depreciation and amortisation expense (249) (314)  
Operating segments      
Disclosure of operating segments [line items]      
Capital expenditure 3,395 2,802  
Depreciation and amortisation expense 2,514 2,367  
Operating assets 51,059   49,883
Operating segments | Iron Ore      
Disclosure of operating segments [line items]      
Consolidated sales revenue 21,707 11,465  
EBITDA 16,060 7,698  
Profit/(loss) after tax – attributable to owners of Rio Tinto 10,216 4,563  
Capital expenditure 1,912 1,185  
Depreciation and amortisation expense 1,022 840  
Operating assets 17,209   16,650
Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 5,932 4,487  
EBITDA 1,924 925  
Profit/(loss) after tax – attributable to owners of Rio Tinto 921 193  
Capital expenditure 524 482  
Depreciation and amortisation expense 645 594  
Operating assets 15,457   15,365
Operating segments | Copper      
Disclosure of operating segments [line items]      
Consolidated sales revenue 3,779 1,983  
EBITDA 2,048 686  
Profit/(loss) after tax – attributable to owners of Rio Tinto 885 111  
Capital expenditure 750 987  
Depreciation and amortisation expense 523 568  
Operating assets 13,972   13,362
Operating segments | Minerals      
Disclosure of operating segments [line items]      
Consolidated sales revenue 3,270 2,322  
EBITDA 1,398 712  
Profit/(loss) after tax – attributable to owners of Rio Tinto 498 190  
Capital expenditure 209 147  
Depreciation and amortisation expense 232 266  
Operating assets 5,305   4,927
Operating segments | Other operations      
Disclosure of operating segments [line items]      
Consolidated sales revenue 85 158  
EBITDA (4) 1  
Profit/(loss) after tax – attributable to owners of Rio Tinto (51) (29)  
Capital expenditure 0 1  
Depreciation and amortisation expense 92 99  
Operating assets (848)   (550)
Inter-segment transactions      
Disclosure of operating segments [line items]      
Consolidated sales revenue (145) (82)  
EBITDA (6) (18)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (3) (6)  
Operating assets (36)   129
Pilbara | Operating segments | Iron Ore      
Disclosure of operating segments [line items]      
Consolidated sales revenue 21,476 11,246  
EBITDA 16,207 7,702  
Profit/(loss) after tax – attributable to owners of Rio Tinto 10,348 4,628  
Capital expenditure 1,907 1,179  
Depreciation and amortisation expense 1,011 831  
Operating assets $ 16,558   16,253
Dampier Salt | Operating segments | Iron Ore      
Disclosure of operating segments [line items]      
Rio Tinto interest (as a percent) 68.40%    
Consolidated sales revenue $ 145 112  
EBITDA 21 25  
Profit/(loss) after tax – attributable to owners of Rio Tinto 5 8  
Capital expenditure 5 6  
Depreciation and amortisation expense 11 9  
Operating assets $ 169   163
Rio Tinto Kennecott | Operating segments | Copper      
Disclosure of operating segments [line items]      
Rio Tinto interest (as a percent) 100.00%    
Consolidated sales revenue $ 1,318 635  
EBITDA 676 193  
Profit/(loss) after tax – attributable to owners of Rio Tinto 323 (12)  
Capital expenditure 203 320  
Depreciation and amortisation expense 249 223  
Operating assets $ 2,282   2,317
Escondida | Operating segments | Copper      
Disclosure of operating segments [line items]      
Rio Tinto interest (as a percent) 30.00%    
Consolidated sales revenue $ 1,486 941  
EBITDA 1,033 564  
Profit/(loss) after tax – attributable to owners of Rio Tinto 537 204  
Capital expenditure 83 118  
Depreciation and amortisation expense 174 239  
Operating assets 2,663   2,726
Iron Ore Company of Canada      
Disclosure of operating segments [line items]      
Consolidated sales revenue 1,718 1,011  
Profit/(loss) after tax – attributable to owners of Rio Tinto 383 151  
Equity attributable to owners of Rio Tinto $ 1,285   1,144
Iron Ore Company of Canada | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Rio Tinto interest (as a percent) 58.70%    
Consolidated sales revenue $ 1,807 1,086  
EBITDA 1,105 473  
Profit/(loss) after tax – attributable to owners of Rio Tinto 398 156  
Capital expenditure 90 51  
Depreciation and amortisation expense 96 88  
Operating assets 1,052   1,009
Rio Tinto Iron & Titanium | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Consolidated sales revenue 973 773  
EBITDA 305 222  
Profit/(loss) after tax – attributable to owners of Rio Tinto 146 80  
Capital expenditure 83 60  
Depreciation and amortisation expense 109 95  
Operating assets $ 3,538   3,390
Rio Tinto Borates | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Rio Tinto interest (as a percent) 100.00%    
Consolidated sales revenue $ 300 293  
EBITDA 64 83  
Profit/(loss) after tax – attributable to owners of Rio Tinto 34 47  
Capital expenditure 17 16  
Depreciation and amortisation expense 25 25  
Operating assets 487   502
Oyu Tolgoi and Turquoise Hill | Operating segments | Copper      
Disclosure of operating segments [line items]      
Consolidated sales revenue 844 409  
EBITDA 528 89  
Profit/(loss) after tax – attributable to owners of Rio Tinto 152 11  
Capital expenditure 460 548  
Depreciation and amortisation expense 98 104  
Operating assets 8,854   8,111
Evaluation projects/other | Operating segments | Iron Ore      
Disclosure of operating segments [line items]      
Consolidated sales revenue 1,003 252  
EBITDA 161 (37)  
Profit/(loss) after tax – attributable to owners of Rio Tinto 110 (77)  
Capital expenditure 0 0  
Depreciation and amortisation expense 0 0  
Operating assets 833   338
Evaluation projects/other | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 0 0  
EBITDA (64) (29)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (49) (14)  
Evaluation projects/other | Operating segments | Copper      
Disclosure of operating segments [line items]      
Consolidated sales revenue 131 (2)  
EBITDA (183) (158)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (125) (91)  
Capital expenditure 4 3  
Depreciation and amortisation expense 2 2  
Operating assets 154   192
Evaluation projects/other | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Consolidated sales revenue 30 29  
EBITDA (92) (54)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (85) (53)  
Capital expenditure 8 0  
Depreciation and amortisation expense 0 0  
Operating assets 37   33
Bauxite | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 1,082 1,170  
EBITDA 338 514  
Profit/(loss) after tax – attributable to owners of Rio Tinto 105 257  
Capital expenditure 67 53  
Depreciation and amortisation expense 165 139  
Operating assets 2,551   2,593
Alumina | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 1,359 1,096  
EBITDA 295 115  
Profit/(loss) after tax – attributable to owners of Rio Tinto 155 38  
Capital expenditure 113 74  
Depreciation and amortisation expense 80 59  
Operating assets 2,116   2,294
Primary Metal | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 3,193 2,111  
EBITDA 1,101 284  
Profit/(loss) after tax – attributable to owners of Rio Tinto 564 (59)  
Capital expenditure 285 303  
Depreciation and amortisation expense 347 325  
Operating assets 9,506   9,361
Pacific Aluminium | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 1,285 965  
EBITDA 273 5  
Profit/(loss) after tax – attributable to owners of Rio Tinto 174 (50)  
Capital expenditure 58 54  
Depreciation and amortisation expense 53 71  
Operating assets 409   455
Integrated operations | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 5,528 4,080  
EBITDA 1,971 951  
Profit/(loss) after tax – attributable to owners of Rio Tinto 958 210  
Other product group Items | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 404 407  
EBITDA 17 3  
Profit/(loss) after tax – attributable to owners of Rio Tinto 12 (3)  
Product group operations | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue 5,932 4,487  
EBITDA 1,988 954  
Profit/(loss) after tax – attributable to owners of Rio Tinto 970 207  
Product group operations | Operating segments | Copper      
Disclosure of operating segments [line items]      
Consolidated sales revenue 3,648 1,985  
EBITDA 2,237 846  
Profit/(loss) after tax – attributable to owners of Rio Tinto 1,012 203  
Capital expenditure 746 986  
Depreciation and amortisation expense 521 566  
Operating assets 13,799   13,154
Product group operations | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Consolidated sales revenue 3,240 2,293  
EBITDA 1,490 766  
Profit/(loss) after tax – attributable to owners of Rio Tinto 583 243  
Capital expenditure 201 147  
Depreciation and amortisation expense 232 266  
Operating assets 5,268   4,894
Diamonds      
Disclosure of operating segments [line items]      
Consolidated sales revenue 160 141  
Diamonds | Operating segments | Minerals      
Disclosure of operating segments [line items]      
Consolidated sales revenue 160 141  
EBITDA 16 (12)  
Profit/(loss) after tax – attributable to owners of Rio Tinto 5 (40)  
Capital expenditure 11 20  
Depreciation and amortisation expense 2 58  
Operating assets 191   (7)
Simandou iron ore project | Operating segments | Copper      
Disclosure of operating segments [line items]      
Consolidated sales revenue 0 0  
EBITDA (6) (2)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (2) (1)  
Capital expenditure 0 (2)  
Depreciation and amortisation expense 0 0  
Operating assets 19   16
Intra-segment and other | Operating segments | Iron Ore      
Disclosure of operating segments [line items]      
Consolidated sales revenue (917) (145)  
EBITDA (329) 8  
Profit/(loss) after tax – attributable to owners of Rio Tinto (247) 4  
Capital expenditure 0 0  
Depreciation and amortisation expense 0 0  
Operating assets (351)   (104)
Intra-segment and other | Operating segments | Aluminium      
Disclosure of operating segments [line items]      
Consolidated sales revenue (1,391) (1,262)  
EBITDA (36) 33  
Profit/(loss) after tax – attributable to owners of Rio Tinto (40) 24  
Capital expenditure 1 (2)  
Depreciation and amortisation expense 0 $ 0  
Operating assets $ 875   $ 662