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Capital structure and financing - C.7.2. Fair value of financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Finance lease liabilities   $ 353
Financial assets at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 2,554 1,467
Current financial assets 2,449 1,341
Non-current financial assets 104 126
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 66 87
Financial assets at amortised cost | Trade receivables, net    
Disclosure of fair value measurement of assets [line items]    
Financial assets 371 343
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 68 73
Financial assets at amortised cost | Prepayments and accrued income    
Disclosure of fair value measurement of assets [line items]    
Financial assets 156 129
Financial assets at amortised cost | Supplier advances for capital expenditures    
Disclosure of fair value measurement of assets [line items]    
Financial assets 22 25
Financial assets at amortised cost | Equity Investment    
Disclosure of fair value measurement of assets [line items]    
Financial assets 371 0
Financial assets at amortised cost | Other current assets    
Disclosure of fair value measurement of assets [line items]    
Financial assets 181 124
Financial assets at amortised cost | Restricted cash    
Disclosure of fair value measurement of assets [line items]    
Financial assets 155 158
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure of fair value measurement of assets [line items]    
Financial assets 1,164 528
Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 9,282 6,698
Current financial liabilities 2,045 2,330
Non-current financial liabilities 7,237 4,370
Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 9,538 6,536
Current financial liabilities 2,045 2,329
Non-current financial liabilities 7,493 4,208
Debt and financing | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,972 4,580
Debt and financing | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 6,229 4,418
Lease liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 1,063 0
Lease liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 1,063 0
Trade payables | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 289 282
Trade payables | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 289 282
Payables and accruals for capital expenditure | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 348 335
Payables and accruals for capital expenditure | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 348 335
Derivative financial instruments | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 17 0
Derivative financial instruments | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 17 (1)
Put option liability | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 264 239
Put option liability | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 264 239
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 498 483
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 498 483
Accrued interest and other expenses | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 432 381
Accrued interest and other expenses | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 432 381
Other liabilities | Financial liabilities at amortised cost    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 399 399
Other liabilities | Financial liabilities at fair value    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities $ 399 $ 399