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Non-current and current financial debts - Maturity of interest expense (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Interest payable $ 1,140 $ 1,083
Not later than one year [member]    
Disclosure of detailed information about borrowings [line items]    
Interest payable 96 94
Between one and five years [member]    
Disclosure of detailed information about borrowings [line items]    
Interest payable 357 336
Later than five years [member]    
Disclosure of detailed information about borrowings [line items]    
Interest payable $ 687 $ 653