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Financial instruments - Schedule of fair value of assets and liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | $ 357 | $ 388 |  |
Current financial assets | 397 | 341 |  |
Total financial assets at fair value and amortized cost or cost | 754 | 729 |  |
Financial liabilities | (3,815) | (209) |  |
Contingent consideration payables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (293) | (162) | $ (123) | $ (113)
Non-current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (1,751) | 0 |  |
Current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (1,759) | (47) |  |
Derivative financial instruments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (12) | 0 |  |
Financial liabilities at amortised cost, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (3,510) | (47) |  |
Financial liabilities at amortised cost, category [member] | Contingent consideration payables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Financial liabilities at amortised cost, category [member] | Non-current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (1,751) | 0 |  |
Financial liabilities at amortised cost, category [member] | Current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (1,759) | (47) |  |
Financial liabilities at amortised cost, category [member] | Derivative financial instruments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 22 | 19 |  |
Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 25 | 27 |  |
Receivables from customers [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 147 | 164 |  |
Current financial assets | 131 | 133 |  |
Minimum lease payments from finance lease agreements [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 82 | 91 |  |
Current financial assets | 53 | 57 |  |
Financial assets, other [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 81 | 87 |  |
Current financial assets | 145 | 83 |  |
VAT receivables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 67 | 68 |  |
Derivatives [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 1 | 0 |  |
Financial assets at amortised cost, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 310 | 342 |  |
Current financial assets | 396 | 341 |  |
Total financial assets at fair value and amortized cost or cost | 706 | 683 |  |
Financial assets at amortised cost, category [member] | Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Financial assets at amortised cost, category [member] | Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Financial assets at amortised cost, category [member] | Receivables from customers [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 147 | 164 |  |
Current financial assets | 131 | 133 |  |
Financial assets at amortised cost, category [member] | Minimum lease payments from finance lease agreements [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 82 | 91 |  |
Current financial assets | 53 | 57 |  |
Financial assets at amortised cost, category [member] | Financial assets, other [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 81 | 87 |  |
Current financial assets | 145 | 83 |  |
Financial assets at amortised cost, category [member] | VAT receivables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 67 | 68 |  |
Financial assets at amortised cost, category [member] | Derivatives [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Contingent consideration payables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Non-current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Derivative financial instruments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Total financial assets at fair value and amortized cost or cost | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Receivables from customers [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Minimum lease payments from finance lease agreements [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial assets, other [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | VAT receivables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Derivatives [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (12) | 0 |  |
Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Contingent consideration payables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Non-current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Derivative financial instruments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (12) | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 1 | 0 |  |
Total financial assets at fair value and amortized cost or cost | 1 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Receivables from customers [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Minimum lease payments from finance lease agreements [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial assets, other [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | VAT receivables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Derivatives [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 1 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (293) | (162) |  |
Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Contingent consideration payables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | (293) | (162) |  |
Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Non-current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Current financial debt [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] | Derivative financial instruments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Financial liabilities | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Total financial assets at fair value and amortized cost or cost | 22 | 19 | 42 | 26
Level 3 of fair value hierarchy [member] | Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Total financial assets at fair value and amortized cost or cost | 25 | 27 | $ 69 | $ 25
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 47 | 46 |  |
Current financial assets | 0 | 0 |  |
Total financial assets at fair value and amortized cost or cost | 47 | 46 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial investments measured at FVOCI [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 22 | 19 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Fund investments [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 25 | 27 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Receivables from customers [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Minimum lease payments from finance lease agreements [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Financial assets, other [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Non-current financial assets | 0 | 0 |  |
Current financial assets | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | VAT receivables [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | 0 | 0 |  |
Level 3 of fair value hierarchy [member] | Financial assets at fair value through profit or loss, category [member] | Derivatives [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Current financial assets | $ 0 | $ 0 |  |

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- Definition The amount of current financial assets. [Refer: Financial assets] + 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 + 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 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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- 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 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 + Details
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