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Provisions (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Provisions      
Provisions, current liabilities $ 1,156 $ 1,826  
Provisions, non-current liabilities 8,003 8,434  
Payroll, related charges and other remunerations      
Provisions      
Provisions, current liabilities 692 877  
Onerous contracts      
Provisions      
Provisions, current liabilities 53 58  
Provisions, non-current liabilities 842 838  
Environmental obligations      
Provisions      
Provisions, current liabilities 95 102  
Provisions, non-current liabilities 214 200  
Asset retirement obligations (i)      
Provisions      
Provisions, current liabilities 102 99  
Provisions, non-current liabilities 3,974 4,121  
Provision related to VNC sale (note 12)      
Provisions      
Provisions, current liabilities   500  
Provisions for litigation      
Provisions      
Provisions, current liabilities 102 87 $ 84
Provisions, non-current liabilities 1,074 1,004 $ 1,060
Employee postretirement obligations (note 24)      
Provisions      
Provisions, current liabilities 112 103  
Provisions, non-current liabilities $ 1,899 $ 2,271