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Non-current and current financial debts - Maturity of borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 4,643 $ 4,739
Non-current financial debts 4,538 4,676
Current financial debts 105 63
Cumulative Effect, Period of Adoption, Adjustment    
Disclosure of detailed information about borrowings [line items]    
Non-current financial debts   82
Current financial debts   (82)
Cost    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4,676 4,776
Cost | Not later than one year    
Disclosure of detailed information about borrowings [line items]    
Borrowings 105 63
Cost | Between one and five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,021 1,163
Cost | Later than five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,550 3,550
Unamortized debt discount and issuance costs    
Disclosure of detailed information about borrowings [line items]    
Borrowings (33) (37)
Nominal amount - Current and non-current financial debt    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4,639 4,729
Nominal amount - Current and non-current financial debt | Cost    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4,672 4,766
Nominal amount - Current and non-current financial debt | Cost | Not later than one year    
Disclosure of detailed information about borrowings [line items]    
Borrowings 101 53
Nominal amount - Current and non-current financial debt | Cost | Between one and five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,021 1,163
Nominal amount - Current and non-current financial debt | Cost | Later than five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,550 3,550
Nominal amount - Current and non-current financial debt | Unamortized debt discount and issuance costs    
Disclosure of detailed information about borrowings [line items]    
Borrowings (33) (37)
Derivatives    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4 10
Current financial debts 4 10
Derivatives | Cost    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4 10
Derivatives | Cost | Not later than one year    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4 10
Derivatives | Cost | Between one and five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0 0
Derivatives | Cost | Later than five years    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0 0
Derivatives | Unamortized debt discount and issuance costs    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 0 $ 0