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Capital structure and financing - C.6. Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial assets at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 1,470 $ 1,553
Current financial assets 1,344 1,440
Non-current financial assets 126 113
Financial assets at amortised cost | Derivative financial instruments    
Disclosure of fair value measurement of assets [line items]    
Financial assets 0 0
Financial assets at amortised cost | Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 87 73
Financial assets at amortised cost | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 343 386
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 73 77
Financial assets at amortised cost | Prepayments and accrued income    
Disclosure of fair value measurement of assets [line items]    
Financial assets 129 145
Financial assets at amortised cost | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 25 18
Financial assets at amortised cost | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 127 90
Financial assets at amortised cost | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 158 145
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 528 619
Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 6,704 5,577
Current financial liabilities 2,335 1,753
Non-current financial liabilities 4,370 3,824
Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 6,542 5,763
Current financial liabilities 2,335 1,753
Non-current financial liabilities 4,207 4,010
Debt and financing | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 4,580 3,785
Debt and financing | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 4,418 3,971
Trade payables | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 282 288
Trade payables | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 282 288
Payables and accruals for capital expenditure | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 335 304
Payables and accruals for capital expenditure | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 335 304
Derivative financial instruments | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 56
Derivative financial instruments | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 0 56
Put option liability | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 239 0
Put option liability | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 239 0
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 483 420
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 483 420
Accrued interest and other expenses | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 383 353
Accrued interest and other expenses | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 383 353
Other liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 402 371
Other liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities $ 402 $ 371