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Financial instruments - additional disclosures (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Cash and cash equivalents [member] | Financial assets at amortised cost, category [member] | Cash and cash equivalents [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 9,658 | $ 11,112
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,173 | 1,215
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale marketable securities [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 26 | 24
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale long-term financial investments [member] | Debt securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 36 | 33
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale long-term financial investments [member] | Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,111 | 1,158
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,827 | 1,323
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Contingent consideration receivables [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 625 | 399
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Associated companies at fair value through profit and loss [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 211 | 186
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Derivative financial instruments [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 159 | 102
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale marketable securities [member] | Fund investments [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets |  | 37
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale long-term financial investments [member] | Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 466 | 366
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale long-term financial investments [member] | Fund investments [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 366 | 233
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 20,744 | 21,839
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Trade receivables [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 8,217 | 8,301
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Other current assets [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 963 | 2,036
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Time deposits with original maturity more than 90 days [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,609 | 61
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Long-term loans and receivables from customers and finance lease, advances, security deposits [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | $ 297 | $ 329

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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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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