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Information by business segment and by geographic area - Assets by geographic area (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Information by business segment and by geographic area      
Investments in associates and joint ventures $ 2,798 $ 3,225 $ 3,568
Intangible 8,499 7,962 8,493
Property, plant and equipment 46,576 48,385 $ 54,878
Total 57,873 59,572  
Brazil      
Information by business segment and by geographic area      
Investments in associates and joint ventures 2,498 2,604  
Intangible 6,496 5,875  
Property, plant and equipment 29,134 29,226  
Total 38,128 37,705  
Canada      
Information by business segment and by geographic area      
Intangible 2,000 1,956  
Property, plant and equipment 10,733 9,905  
Total 12,733 11,861  
Americas, except Brazil and Canada      
Information by business segment and by geographic area      
Investments in associates and joint ventures 242 247  
Total 242 247  
Europe      
Information by business segment and by geographic area      
Intangible 2    
Property, plant and equipment 900 366  
Total 902 366  
Indonesia      
Information by business segment and by geographic area      
Intangible 1 1  
Property, plant and equipment 2,761 2,776  
Total 2,762 2,777  
Asia, except Indonesia      
Information by business segment and by geographic area      
Investments in associates and joint ventures 58 374  
Property, plant and equipment 995 1,025  
Total 1,053 1,399  
New Caledonia      
Information by business segment and by geographic area      
Property, plant and equipment 604 2,796  
Total 604 2,796  
Mozambique      
Information by business segment and by geographic area      
Intangible   130  
Property, plant and equipment   1,459  
Total   1,589  
Oman      
Information by business segment and by geographic area      
Property, plant and equipment 1,449 829  
Total $ 1,449 829  
Other regions      
Information by business segment and by geographic area      
Property, plant and equipment   3  
Total   $ 3