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Financial instruments - Summary of Assets and Liabilities Carried at Fair Value, Classification of Fair Value Calculations by Category (Details) - EUR (€)
€ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Assets at fair value      
Financial assets at fair value through other comprehensive income € 2,447 € 2,216 € 537
Derivatives      
Financial assets at fair value through profit and loss:      
Other 278 190 360
Other      
Financial assets at fair value through profit and loss:      
Other 784 871 851
Fair value      
Assets at fair value      
Financial assets at fair value through other comprehensive income 2,447 2,216 537
Liabilities at fair value      
Derivatives financial assets, reported within trade receivables 72 20 60
Derivatives financial liabilities, reported within trade creditors (65) (51) (58)
Fair value | Derivatives      
Financial assets at fair value through profit and loss:      
Other 277 190 360
Fair value | Other      
Financial assets at fair value through profit and loss:      
Other 785 871 851
Fair value | Level 1      
Assets at fair value      
Financial assets at fair value through other comprehensive income 1,858 1,663 10
Fair value | Level 1 | Derivatives      
Liabilities at fair value      
Derivatives 0 0 0
Fair value | Level 1 | Financial liabilities at fair value      
Liabilities at fair value      
Contingent consideration 0 0 0
Fair value | Level 1 | Derivatives      
Financial assets at fair value through profit and loss:      
Derivatives 0 0 0
Fair value | Level 1 | Other      
Financial assets at fair value through profit and loss:      
Other 381 530 488
Fair value | Level 2      
Assets at fair value      
Financial assets at fair value through other comprehensive income 4 4 4
Fair value | Level 2 | Derivatives      
Liabilities at fair value      
Derivatives (597) (503) (672)
Fair value | Level 2 | Financial liabilities at fair value      
Liabilities at fair value      
Contingent consideration 0 0 0
Fair value | Level 2 | Derivatives      
Financial assets at fair value through profit and loss:      
Derivatives 349 210 420
Fair value | Level 2 | Other      
Financial assets at fair value through profit and loss:      
Other 0 0 0
Fair value | Level 3      
Assets at fair value      
Financial assets at fair value through other comprehensive income 586 549 523
Fair value | Level 3 | Derivatives      
Liabilities at fair value      
Derivatives 0 0 0
Fair value | Level 3 | Financial liabilities at fair value      
Liabilities at fair value      
Contingent consideration (20) (46) (46)
Fair value | Level 3 | Derivatives      
Financial assets at fair value through profit and loss:      
Derivatives 0 0 0
Fair value | Level 3 | Other      
Financial assets at fair value through profit and loss:      
Other € 404 € 341 € 363