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Financial instruments fair value risk - Summary of Assets and Liabilities Carried at Fair Value, Classification of Fair Value Calculations by Category (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Financial assets at fair value through other comprehensive income € 609 € 407
Other    
Financial assets at fair value through profit or loss    
Other 981 889
Fair value    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Financial assets at fair value through other comprehensive income 609 407
Financial assets at fair value through profit or loss    
Derivatives 149 378
Derivatives assets, reported within trade receivables 37 89
Derivatives financial liabilities reported within trade receivables hedge trading activities (65) (153)
Fair value | Other    
Financial assets at fair value through profit or loss    
Other 981 889
Fair value | Level 1    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Financial assets at fair value through other comprehensive income 163 5
Financial assets at fair value through profit or loss    
Derivatives 0 0
Fair value | Level 1 | Other    
Financial assets at fair value through profit or loss    
Other 582 428
Fair value | Level 2    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Financial assets at fair value through other comprehensive income 4 3
Financial assets at fair value through profit or loss    
Derivatives 149 378
Fair value | Level 2 | Other    
Financial assets at fair value through profit or loss    
Other 0 0
Fair value | Level 3    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Financial assets at fair value through other comprehensive income 442 399
Financial assets at fair value through profit or loss    
Derivatives 0 0
Fair value | Level 3 | Other    
Financial assets at fair value through profit or loss    
Other 399 461
Fair value | Financial liabilities    
Financial assets at fair value through profit or loss    
Derivatives (559) (784)
Contingent consideration (157) (164)
Fair value | Financial liabilities | Level 1    
Financial assets at fair value through profit or loss    
Derivatives 0 0
Contingent consideration 0 0
Fair value | Financial liabilities | Level 2    
Financial assets at fair value through profit or loss    
Derivatives (559) (784)
Contingent consideration 0 0
Fair value | Financial liabilities | Level 3    
Financial assets at fair value through profit or loss    
Derivatives 0 0
Contingent consideration € (157) € (164)