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Notes to the Consolidated Financial Statements (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting policies        
Fixed assets $ 116,408 $ 113,324 $ 109,397 $ 111,971
Net debt $ (31,124) $ (21,657) $ (15,424)  
Weighted average incremental borrowing rate   4.50%    
Increase/decrease due to application of IFRS 16        
Accounting policies        
Fixed assets   $ 5,698    
Net debt   (5,505)    
Other assets and liabilities   (193)    
Right of use   5,698    
Increase/decrease due to application of IFRS 16 | Buildings        
Accounting policies        
Right of use   2,278    
Increase/decrease due to application of IFRS 16 | Machinery, plant and equipment        
Accounting policies        
Right of use   2,632    
Increase/decrease due to application of IFRS 16 | Other        
Accounting policies        
Right of use   $ 788