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Financial instruments - Schedule of fair value of assets and liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value $ 763 $ 652    
Long-term convertible notes due from associated companies 0 11    
Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (120) (100)    
Recurring fair value measurement | Contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (110) (96)    
Recurring fair value measurement | Derivative financial instruments        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (10) (4)    
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 (10) (4)    
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 (10) (4)    
Level 3 | Contingent consideration liabilities        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (110) (96) $ (94) $ (90)
Level 3 | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Financial liabilities at fair value (110) (96)    
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 (110) (96)    
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    
Financial assets | Recurring fair value measurement        
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]        
Non-current financial assets at fair value 548 463    
Current financial assets at fair value 699 445    
Financial assets at fair value 1,247 908    
Financial 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 376 261    
Current financial assets at fair value 690 432    
Financial assets at fair value 1,066 693    
Financial 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    
Current financial assets at fair value 7 12    
Financial assets at fair value 7 12    
Financial 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 172 202    
Current financial assets at fair value 2 1    
Financial assets at fair value 174 203    
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 188 180    
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 188 180    
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 690 432    
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 690 432    
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 7 12    
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 7 12    
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 359 282    
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 188 81    
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 171 201    
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 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]        
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 1 1    
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 2 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 $ 2 $ 1