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Accounting policies (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Accounting policies        
Fixed assets $ 118,063 $ 117,881 $ 113,324 $ 114,047
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