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Off balance sheet commitments and lease contracts - Impact of application of IFRS 16 (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Initial application        
Fixed assets $ 108,335 $ 116,408 $ 113,324 $ 109,397
Net debt $ (37,139) $ (31,124) (21,657)  
Increase/decrease due to application of IFRS 16        
Initial application        
Fixed assets     5,698  
Net debt     (5,505)  
Other assets and liabilities     $ (193)  
Weighted average incremental borrowing rate     4.50%  
Right of use     $ 5,698  
Increase/decrease due to application of IFRS 16 | Buildings        
Initial application        
Right of use     2,278  
Increase/decrease due to application of IFRS 16 | Machinery, plant and equipment        
Initial application        
Right of use     2,632  
Increase/decrease due to application of IFRS 16 | Other        
Initial application        
Right of use     $ 788