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Capital structure and financing - C.7.2. Fair value of financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial assets at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 2,337 $ 2,564
Current financial assets 2,143 2,460
Non-current financial assets 194 104
Financial assets at amortised cost | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 24 0
Financial assets at amortised cost | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 77 66
Financial assets at amortised cost | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 351 371
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 296 68
Financial assets at amortised cost | Prepayments and accrued income    
Disclosure of fair value measurement of assets [line items]    
Financial assets 149 156
Financial assets at amortised cost | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 21 22
Financial assets at amortised cost | Call option    
Disclosure of fair value measurement of assets [line items]    
Financial assets 3 0
Financial assets at amortised cost | Equity Investments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 160 371
Financial assets at amortised cost | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 181 192
Financial assets at amortised cost | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 199 155
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 875 1,164
Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 8,317 8,219
Current financial liabilities 2,145 1,949
Non-current financial liabilities 6,173 6,270
Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 8,198 8,475
Current financial liabilities 2,145 1,949
Non-current financial liabilities 6,054 6,527
Debt and financing | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,691 5,972
Debt and financing | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,572 6,229
Trade payables | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 334 289
Trade payables | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 334 289
Payables and accruals for capital expenditure | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 345 348
Payables and accruals for capital expenditure | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 345 348
Derivative financial instruments | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 16 17
Derivative financial instruments | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 16 17
Put option liability | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 262 264
Put option liability | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 262 264
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 339 498
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 339 498
Accrued interest and other expenses | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 445 432
Accrued interest and other expenses | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 445 432
Other liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 885 399
Other liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities $ 885 $ 399