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Implementation of IFRS16 Leases - Impact of IFRS 16 on consolidated balance sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset [abstract]        
Property, plant and equipment $ 69,953 $ 69,254 $ 65,262  
Prepayments and financial receivables 1,214 1,085 1,033  
Total non-current assets 93,285   86,452 $ 83,911
Trade and other receivables 8,233 9,043 8,998  
Total current assets 24,778   26,056  
Assets 118,063   112,508  
Liabilities [abstract]        
Non-current finance debt 24,945 26,423 23,264  
Provisions 17,951 15,847 15,952  
Total non-current liabilities 57,346   52,914  
Trade, other payables and provisions 10,450 8,335 8,369  
Current finance debt 4,087 3,532 2,463  
Total current liabilities 19,557   16,605  
Total liabilities 76,904   69,519  
Right of use Assets 4,011 4,400 4,372  
Lease Liabilities 4,339 4,660 $ 432  
IFRS 16 Adjustments [member]        
Asset [abstract]        
Property, plant and equipment   3,992    
Prepayments and financial receivables   52    
Total non-current assets 3,738 4,044    
Trade and other receivables   45    
Total current assets 29 45    
Assets 3,767 4,089    
Liabilities [abstract]        
Non-current finance debt   3,159    
Provisions   (105)    
Total non-current liabilities 2,781 3,054    
Trade, other payables and provisions   (34)    
Current finance debt   1,069    
Total current liabilities $ 1,061 1,035    
Total liabilities   4,089    
Right of use Assets   4,000    
Lease Liabilities   $ 4,200