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Information by business segment and geographic area (Details 3) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Investments in associates and joint ventures $ 4,547 $ 1,872  
Intangible 10,514 11,631 $ 10,238
Property, plant and equipment 39,984 48,396 $ 44,938
Total 55,045 61,899  
Country Of Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Investments in associates and joint ventures 2,046 1,872  
Intangible 8,847 9,822  
Property, plant and equipment 28,706 33,769  
Total 39,599 45,463  
Country Of Canada [Member]      
IfrsStatementLineItems [Line Items]      
Intangible 1,666 1,808  
Property, plant and equipment 9,452 11,890  
Total 11,118 13,698  
Americas Except Brazil And Canada [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment 3 4  
Total 3 4  
Country Of Indonesia [Member]      
IfrsStatementLineItems [Line Items]      
Investments in associates and joint ventures 1,885    
Property, plant and equipment 61 59  
Total 1,946 59  
Country Of China [Member]      
IfrsStatementLineItems [Line Items]      
Intangible 1 1  
Property, plant and equipment 4 14  
Total 5 15  
Asia Except China And Indonesia [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment 654 731  
Total 654 731  
Country Of Europe [Member]      
IfrsStatementLineItems [Line Items]      
Property, plant and equipment 589 678  
Total 589 678  
Country Of Oman [Member]      
IfrsStatementLineItems [Line Items]      
Investments in associates and joint ventures 616    
Property, plant and equipment 515 1,251  
Total $ 1,131 $ 1,251