XML 578 R98.htm IDEA: XBRL DOCUMENT v3.20.4
Operating segments - Summary of capital expenditure within the reportable segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [Line Items]      
Capital expenditure $ 6,144 $ 5,439 $ 4,844
Sales of property, plant and equipment and intangible assets 45 49 586
Capital expenditure per cash flow statement 6,189 5,488 5,430
Other Operations      
Disclosure of operating segments [Line Items]      
Capital expenditure 2 (4) 12
Product group      
Disclosure of operating segments [Line Items]      
Capital expenditure 6,320 5,831 5,279
Other items      
Disclosure of operating segments [Line Items]      
Capital expenditure 79 64 65
Capital expenditure of equity accounted units      
Disclosure of operating segments [Line Items]      
Capital expenditure (255) (456) (500)
Operating segments | Reportable segments      
Disclosure of operating segments [Line Items]      
Capital expenditure 6,318 5,835 5,267
Operating segments | Iron Ore      
Disclosure of operating segments [Line Items]      
Capital expenditure 2,941 1,741 1,302
Operating segments | Aluminium      
Disclosure of operating segments [Line Items]      
Capital expenditure 1,085 1,456 1,373
Operating segments | Copper & Diamonds      
Disclosure of operating segments [Line Items]      
Capital expenditure 1,864 2,087 2,150
Operating segments | Energy & Minerals      
Disclosure of operating segments [Line Items]      
Capital expenditure $ 428 $ 551 442
Kitimat      
Disclosure of operating segments [Line Items]      
Sales of property, plant and equipment and intangible assets     $ 508