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Capital structure and financing - C.7.2. Fair value of financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial assets at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 1,920 $ 2,134
Current financial assets 1,825 2,015
Non-current financial assets 95 119
Financial assets at amortised cost | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 19 21
Financial assets at amortised cost | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 76 74
Financial assets at amortised cost | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 379 405
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 65
Financial assets at amortised cost | Prepayments and accrued income    
Disclosure of fair value measurement of assets [line items]    
Financial assets 117 166
Financial assets at amortised cost | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 21 35
Financial assets at amortised cost | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 197 269
Financial assets at amortised cost | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 57 203
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,039 895
Financial assets at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,920 2,134
Current financial assets 1,825 2,015
Non-current financial assets 95 119
Financial assets at fair value | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 19 21
Financial assets at fair value | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 76 74
Financial assets at fair value | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 379 405
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 65
Financial assets at fair value | Prepayments and accrued income    
Disclosure of fair value measurement of assets [line items]    
Financial assets 117 166
Financial assets at fair value | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 21 35
Financial assets at fair value | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 197 269
Financial assets at fair value | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 57 203
Financial assets at fair value | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,039 895
Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 8,812 10,260
Current financial liabilities 1,601 3,858
Non-current financial liabilities 7,210 6,403
Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 8,335 10,334
Current financial liabilities 1,601 3,858
Non-current financial liabilities 6,733 6,476
Debt and financing | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 6,804 7,744
Debt and financing | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 6,327 7,817
Trade payables | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 400 347
Trade payables | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 400 347
Payables and accruals for capital expenditure | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 428 452
Payables and accruals for capital expenditure | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 428 452
Derivative financial instruments | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 53 1
Derivative financial instruments | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 53 1
Put option liability | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 290
Put option liability | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 290
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 58 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 58 74
Accrued interest and other expenses | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 412 539
Accrued interest and other expenses | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 412 539
Other liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 658 814
Other liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities $ 658 $ 814