v3.26.1
Financial instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Cash and cash equivalents [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 10  
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 10  
Recurring fair value measurement [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 211 $ 185
Recurring fair value measurement [member] | Marketable securities and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 72 57
Recurring fair value measurement [member] | Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 59 88
Recurring fair value measurement [member] | Current contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 111 101
Recurring fair value measurement [member] | Current debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 18 27
Recurring fair value measurement [member] | Long-term financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,986 1,839
Recurring fair value measurement [member] | Long-term financial investments [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 233 202
Recurring fair value measurement [member] | Long-term financial investments [member] | Debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 952 791
Recurring fair value measurement [member] | Long-term financial investments [member] | Non-current contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 742 758
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 15 15
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Current debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 5 15
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Long-term financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 467 274
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Long-term financial investments [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 19 19
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Long-term financial investments [member] | Debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 448 255
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 73 57
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Marketable securities and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 72 57
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Current debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1  
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Long-term financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 6 7
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Long-term financial investments [member] | Debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 6 7
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 123 113
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 59 88
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Current contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 111 101
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Current debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 12 12
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long-term financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,513 1,558
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long-term financial investments [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 214 183
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long-term financial investments [member] | Debt and equity securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 498 529
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long-term financial investments [member] | Non-current contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 742 $ 758