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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

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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