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Provisions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Provisions    
Current liabilities $ 1,045 $ 1,664
Non-current liabilities 3,419 4,113
Provisions for litigation (note 28)    
Provisions    
Current liabilities 93 87
Non-current liabilities 1,012 1,004
Employee postretirement obligations (note 29)    
Provisions    
Current liabilities 99 103
Non-current liabilities 1,533 2,271
Payroll, related charges and other remunerations    
Provisions    
Current liabilities 816 877
Onerous contracts (note 19)    
Provisions    
Current liabilities 37 58
Non-current liabilities $ 874 838
Provision related to VNC sale (note 15)    
Provisions    
Current liabilities   500
Miscellaneous Other Provisions    
Provisions    
Current liabilities   $ 39