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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
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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[Line Items] for Disclosure of fair value measurement of assets and liabilities [Table]

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The amount of current financial assets. [Refer: Financial assets]

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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]

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