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Implementation of IFRS16 Leases - impact of IFSRS 16 on consoidated balance sheet 2 (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of expected impact of initial application of new standards or interpretations [line items]          
Noncurrent Assets $ 93,285   $ 86,452 $ 83,911  
Current Assets 24,778   26,056    
Total assets 118,063   112,508    
Total equity 41,159   42,990 $ 39,885 $ 35,099
Total non-current liabilities 57,346   52,914    
Total current liabilities 19,557   16,605    
Total equity and liabilities 118,063   $ 112,508    
weighted average incremental borrowing rate used when calculating lease liabilities   3.10%      
Previously stated [member]          
Disclosure of expected impact of initial application of new standards or interpretations [line items]          
Noncurrent Assets 89,546        
Current Assets 24,750        
Total assets 114,296        
Total equity 41,235        
Total non-current liabilities 54,565        
Total current liabilities 18,496        
Total equity and liabilities 114,296        
IFRS 16 Adjustments [member]          
Disclosure of expected impact of initial application of new standards or interpretations [line items]          
Noncurrent Assets 3,738 $ 4,044      
Current Assets 29 45      
Total assets 3,767 4,089      
Total equity (76)        
Total non-current liabilities 2,781 3,054      
Total current liabilities 1,061 $ 1,035      
Total equity and liabilities $ 3,767