v3.25.2
Financial instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Cash and cash equivalents [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 50 $ 50
Cash and cash equivalents [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 50 50
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 50 50
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 50 50
Recurring fair value measurement [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 268 106
Recurring fair value measurement [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 268 106
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 83 109
Recurring fair value measurement [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 125 120
Recurring fair value measurement [member] | Fund investments and equity securities current [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 39 42
Recurring fair value measurement [member] | Long term financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,670 1,680
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 172 210
Recurring fair value measurement [member] | Long term financial investments [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 737 799
Recurring fair value measurement [member] | Long term financial investments [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 761 671
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Fund investments and equity securities current [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 21 24
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 169 208
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 11 15
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member] | Long term financial investments [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 158 193
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 268 106
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 268 106
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 8 7
Recurring fair value measurement [member] | Level 2 of fair value hierarchy [member] | Long term financial investments [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 8 7
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 83 109
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 125 120
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Fund investments and equity securities current [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 18 18
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 1,493 1,465
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 161 195
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long term financial investments [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 571 599
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Long term financial investments [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 761 $ 671