v3.26.1
Financial instruments - Schedule of fair value of assets and liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value $ 768 $ 768    
Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 492 534    
Current financial assets at fair value 335 568    
Financial assets at fair value 827 1,102    
Non-current financial liabilities (64) (160)    
Current financial liabilities (12) (15)    
Financial liabilities at fair value (76) (175)    
Recurring fair value measurement | Non-current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial liabilities (64) (160)    
Recurring fair value measurement | Current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities (9) (9)    
Recurring fair value measurement | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities (3) (6)    
Level 1 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 292 334    
Current financial assets at fair value 319 562    
Financial assets at fair value 611 896    
Non-current financial liabilities 0 0    
Current financial liabilities 0 0    
Financial liabilities at fair value 0 0    
Level 1 | Recurring fair value measurement | Non-current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial liabilities 0 0    
Level 1 | Recurring fair value measurement | Current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities 0 0    
Level 1 | Recurring fair value measurement | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities 0 0    
Level 2 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 0 0    
Current financial assets at fair value 15 5    
Financial assets at fair value 15 5    
Non-current financial liabilities 0 0    
Current financial liabilities (3) (6)    
Financial liabilities at fair value (3) (6)    
Level 2 | Recurring fair value measurement | Non-current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial liabilities 0 0    
Level 2 | Recurring fair value measurement | Current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities 0 0    
Level 2 | Recurring fair value measurement | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities (3) (6)    
Level 3 | Non-current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (73) (169) $ (110) $ (96)
Level 3 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 200 200    
Current financial assets at fair value 1 1    
Financial assets at fair value 201 201    
Non-current financial liabilities (64) (160)    
Current financial liabilities (9) (9)    
Financial liabilities at fair value (73) (169)    
Level 3 | Recurring fair value measurement | Non-current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial liabilities (64) (160)    
Level 3 | Recurring fair value measurement | Current contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities (9) (9)    
Level 3 | Recurring fair value measurement | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Current financial liabilities 0 0    
Deferred compensation assets | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 212 202    
Deferred compensation assets | Level 1 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 212 202    
Deferred compensation assets | Level 2 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 0 0    
Deferred compensation assets | Level 3 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 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 319 562    
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 319 562    
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 15 5    
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 15 5    
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    
Measured at FVOCI | Long-term financial investments | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 257 328    
Measured at FVOCI | Long-term financial investments | Level 1 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 80 132    
Measured at FVOCI | Long-term financial investments | Level 2 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 0 0    
Measured at FVOCI | Long-term financial investments | Level 3 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 177 196    
Measured at FVPL | Long-term financial investments | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 23 4    
Measured at FVPL | Long-term financial investments | Level 1 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 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]        
Non-current financial assets at fair value 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]        
Non-current financial assets at fair value 23 4    
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 1    
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 $ 1