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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
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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

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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 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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