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Financial instruments (Details) - Recurring fair value measurement [member] - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | $ 193 | $ 163
Marketable securities, time deposits and derivative financial instruments [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 24 | 24
Marketable securities, time deposits and derivative financial instruments [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 33 | 37
Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 57 | 61
Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 136 | 102
Associated companies at fair value through profit and loss [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 175 | 186
Long term financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 2,122 | 2,189
Long term financial investments [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 235 | 233
Long term financial investments [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 1,443 | 1,557
Long term financial investments [member] | Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 444 | 399
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 33 | 37
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 33 | 37
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 33 | 37
Level 1 of fair value hierarchy [member] | Long term financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 904 | 976
Level 1 of fair value hierarchy [member] | Long term financial investments [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 904 | 976
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 160 | 126
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 24 | 24
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 24 | 24
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 136 | 102
Level 3 of fair value hierarchy [member] | Associated companies at fair value through profit and loss [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 175 | 186
Level 3 of fair value hierarchy [member] | Long term financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 1,218 | 1,213
Level 3 of fair value hierarchy [member] | Long term financial investments [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 235 | 233
Level 3 of fair value hierarchy [member] | Long term financial investments [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 539 | 581
Level 3 of fair value hierarchy [member] | Long term financial investments [member] | Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | $ 444 | $ 399

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + 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 + Details
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