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Financial instruments - additional disclosures - Details of net financial assets and financial liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | $ 3,605 | $ 3,071
Total financial liabilities | 5,536 | 4,896
Net financial assets and financial liabilities | (1,931) | (1,825)
Financial debts [member] | Senior notes due 2026, 2029, 2030, and 2049 [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 2,726 | 1,979
Financial liabilities, at fair value | 3,036 | 2,049
Financial liabilities - measured at amortized cost or cost [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 5,372 | 4,637
Financial liabilities - measured at amortized cost or cost [member] | Financial debts [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 162 | 245
Financial liabilities - measured at amortized cost or cost [member] | Current Lease liabilities [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 70 | 61
Financial liabilities - measured at amortized cost or cost [member] | Trade payables [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 876 | 833
Financial liabilities - measured at amortized cost or cost [member] | Current financial liabilities [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 1,108 | 1,139
Financial liabilities - measured at amortized cost or cost [member] | Financial debts [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 3,949 | 3,218
Financial liabilities - measured at amortized cost or cost [member] | Non-current Lease liabilities [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 315 | 280
Financial liabilities - measured at amortized cost or cost [member] | Non-current financial liabilities [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 4,264 | 3,498
Financial liabilities - measured at FVPL [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 164 | 259
Financial liabilities - measured at FVPL [member] | Contingent consideration liabilities [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 157 | 243
Financial liabilities - measured at FVPL [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial liabilities | 7 | 16
Cash in current accounts [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 262 | 392
Cash held in time deposits and money market funds [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 1,295 | 430
Cash and cash equivalents [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 1,557 | 822
Financial assets - measured at fair value through other comprehensive income (FVOCI) [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 28 | 31
Financial assets - measured at fair value through other comprehensive income (FVOCI) [member] | Long-term financial investments [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 28 | 31
Financial assets - measured at amortized costs [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 1,856 | 2,034
Financial assets - measured at amortized costs [member] | Trade receivables [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 1,361 | 1,390
Financial assets - measured at amortized costs [member] | Income tax receivables [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 21 | 17
Financial assets - measured at amortized costs [member] | Other current assets (excluding prepaid expenses and other current assets measured at FVPL) [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 296 | 379
Financial assets - measured at amortized costs [member] | Long-term receivables from customers [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 117 | 136
Financial assets - measured at amortized costs [member] | Non-current minimum lease payments from finance leases [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 39 | 78
Financial assets - measured at amortized costs [member] | Long-term loans, advances, security deposits and warrant options [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 22 | 34
Financial assets - measured at fair value through profit and loss (FVPL) [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 164 | 184
Financial assets - measured at fair value through profit and loss (FVPL) [member] | Long-term financial investments [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 12 | 28
Financial assets - measured at fair value through profit and loss (FVPL) [member] | Deferred compensation assets [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 137 | 122
Financial assets - measured at fair value through profit and loss (FVPL) [member] | Current portion of long-term financial investments [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | 12 | 33
Financial assets - measured at fair value through profit and loss (FVPL) [member] | Derivative fInancial instruments [member] |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |
Total financial assets | $ 3 | $ 1

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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 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35M&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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