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Financial instruments - additional disclosures - Schedule of fair value of assets and liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	$ 652	$ 517
Financial assets at fair value	4,674	3,893
Financial liabilities at fair value	(6,009)	(6,046)
Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(100)	(100)
Recurring fair value measurement | Contingent consideration liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(96)	(90)
Recurring fair value measurement | Derivative financial instruments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(4)	(10)
Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	0	0
Level 1 | Recurring fair value measurement | Contingent consideration liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	0	0
Level 1 | Recurring fair value measurement | Derivative financial instruments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	0	0
Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(4)	(10)
Level 2 | Recurring fair value measurement | Contingent consideration liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	0	0
Level 2 | Recurring fair value measurement | Derivative financial instruments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(4)	(10)
Level 3 | Contingent consideration liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(96)	(90)	$ (98)
Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(96)	(90)
Level 3 | Recurring fair value measurement | Contingent consideration liabilities
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	(96)	(90)
Level 3 | Recurring fair value measurement | Derivative financial instruments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial liabilities at fair value	0	0
Investments, derivative financial instruments and deferred compensation assets | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	463	311
Current financial assets at fair value	445	93
Financial assets at fair value	908	404
Investments, derivative financial instruments and deferred compensation assets | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	261	163
Current financial assets at fair value	432	84
Financial assets at fair value	693	247
Investments, derivative financial instruments and deferred compensation assets | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Current financial assets at fair value	12	2
Financial assets at fair value	12	2
Investments, derivative financial instruments and deferred compensation assets | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	202	148
Current financial assets at fair value	1	7
Financial assets at fair value	203	155
Deferred compensation assets | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	180	163
Deferred compensation assets | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	180	163
Deferred compensation assets | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Deferred compensation assets | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Money market funds | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	432	84
Money market funds | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	432	84
Money market funds | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Money market funds | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Derivative financial instruments | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	12	2
Derivative financial instruments | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Derivative financial instruments | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	12	2
Derivative financial instruments | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Financial assets - measured at fair value through other comprehensive income ("FVOCI")
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	282	147
Financial assets - measured at fair value through other comprehensive income ("FVOCI") | Long-term financial investments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	282	147
Financial assets - measured at fair value through other comprehensive income ("FVOCI") | Long-term financial investments | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	282	147
Financial assets - measured at fair value through other comprehensive income ("FVOCI") | Long-term financial investments | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	81	0
Financial assets - measured at fair value through other comprehensive income ("FVOCI") | Long-term financial investments | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Financial assets - measured at fair value through other comprehensive income ("FVOCI") | Long-term financial investments | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	201	147
Measured at FVPL
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	194	173
Measured at FVPL | Long-term financial investments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	1	1
Measured at FVPL | Long-term financial investments | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	1	1
Measured at FVPL | Long-term financial investments | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Measured at FVPL | Long-term financial investments | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	0	0
Measured at FVPL | Long-term financial investments | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets	1	1
Measured at FVPL | Deferred compensation assets
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	180	163
Measured at FVPL | Current portion of long-term financial investments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	1	7
Measured at FVPL | Current portion of long-term financial investments | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	1	7
Measured at FVPL | Current portion of long-term financial investments | Level 1 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Measured at FVPL | Current portion of long-term financial investments | Level 2 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	0	0
Measured at FVPL | Current portion of long-term financial investments | Level 3 | Recurring fair value measurement
Disclosure of fair value measurement of assets and liabilities [Line Items]
Current financial assets at fair value	1	7
Measured at FVPL | Derivative financial instruments
Disclosure of fair value measurement of assets and liabilities [Line Items]
Financial assets at fair value	$ 12	$ 2

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

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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: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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