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Information by business segment and by geographic area - Assets by geographic area (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Information by business segment and by geographic area      
Investments in associates and joint ventures $ 2,031 $ 2,798 $ 3,225
Intangible 9,296 8,499 7,962
Property, plant and equipment 41,148 46,576 $ 48,385
Total 52,475 57,873  
Brazil      
Information by business segment and by geographic area      
Investments in associates and joint ventures 1,760 2,498  
Intangible 7,341 6,496  
Property, plant and equipment 23,364 29,134  
Total 32,465 38,128  
Canada      
Information by business segment and by geographic area      
Intangible 1,951 2,000  
Property, plant and equipment 11,798 10,733  
Total 13,749 12,733  
Americas, except Brazil and Canada      
Information by business segment and by geographic area      
Investments in associates and joint ventures 234 242  
Property, plant and equipment 5    
Total 239 242  
Europe      
Information by business segment and by geographic area      
Intangible   2  
Property, plant and equipment 894 900  
Total 894 902  
Indonesia      
Information by business segment and by geographic area      
Intangible 2 1  
Property, plant and equipment 2,729 2,761  
Total 2,731 2,762  
China      
Information by business segment and by geographic area      
Investments in associates and joint ventures 17 19  
Intangible 2    
Property, plant and equipment 19 10  
Total 38 29  
Asia, except Indonesia      
Information by business segment and by geographic area      
Investments in associates and joint ventures 20 39  
Property, plant and equipment 951 985  
Total 971 1,024  
New Caledonia      
Information by business segment and by geographic area      
Property, plant and equipment   604  
Total   604  
Oman      
Information by business segment and by geographic area      
Property, plant and equipment 1,388 1,449  
Total $ 1,388 $ 1,449