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Capital structure and financing - C.7.2. Fair value of financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial assets at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 1,426 $ 1,587
Current financial assets 1,343 1,503
Non-current financial assets 84 84
Financial assets at amortised cost | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 0 6
Financial assets at amortised cost | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 84 84
Financial assets at amortised cost | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 390 443
Financial assets at amortised cost | Amounts due from non-controlling interests, associates and joint venture partners    
Disclosure of fair value measurement of assets [line items]    
Financial assets 15 12
Financial assets at amortised cost | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 16 21
Financial assets at amortised cost | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 166 190
Financial assets at amortised cost | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 57 56
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 699 775
Financial assets at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,426 1,587
Current financial assets 1,343 1,503
Non-current financial assets 84 84
Financial assets at fair value | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 0 6
Financial assets at fair value | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 84 84
Financial assets at fair value | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 390 443
Financial assets at fair value | Amounts due from non-controlling interests, associates and joint venture partners    
Disclosure of fair value measurement of assets [line items]    
Financial assets 15 12
Financial assets at fair value | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 16 21
Financial assets at fair value | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 166 190
Financial assets at fair value | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 57 56
Financial assets at fair value | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 699 775
Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 7,606 9,161
Current financial liabilities 1,732 1,670
Non-current financial liabilities 5,875 7,491
Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 7,269 8,569
Current financial liabilities 1,732 1,689
Non-current financial liabilities 5,538 6,881
Debt and financing | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,815 6,678
Debt and financing | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,478 6,086
Trade payables | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 300 390
Trade payables | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 300 390
Payables and accruals for capital expenditure | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 305 314
Payables and accruals for capital expenditure | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 305 314
Derivative financial instruments | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 59 46
Derivative financial instruments | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 59 46
Put option liability | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 86
Put option liability | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 86
Amounts due to non-controlling interests, associates and joint venture partners | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 138 74
Amounts due to non-controlling interests, associates and joint venture partners | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 138 74
Accrued interest and other expenses | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 421 444
Accrued interest and other expenses | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 421 444
Other liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 568 1,128
Other liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities $ 568 $ 1,128