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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, 2021
Dec. 31, 2020
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Comprehensive income € 527 € 370
Financial assets at fair value through profit or loss    
Derivatives (168) (321)
Fair value    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Comprehensive income 527 370
Financial assets at fair value through profit or loss    
Derivatives 289 158
Derivatives assets, reported within trade receivables 161 78
Derivatives financial liabilities reported within trade receivables hedge trading activities (51) (103)
Fair value | Other Financial Assets    
Financial assets at fair value through profit or loss    
Financial assets 741 628
Fair value | Level 1    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Comprehensive income 6 5
Financial assets at fair value through profit or loss    
Derivatives 0 0
Fair value | Level 1 | Other Financial Assets    
Financial assets at fair value through profit or loss    
Financial assets 331 300
Fair value | Level 2    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Comprehensive income 3 3
Financial assets at fair value through profit or loss    
Derivatives 289 158
Fair value | Level 2 | Other Financial Assets    
Financial assets at fair value through profit or loss    
Financial assets 0 0
Fair value | Level 3    
Disclosure of Detailed Information about Financial Instruments [Line Items]    
Comprehensive income 518 362
Financial assets at fair value through profit or loss    
Derivatives 0 0
Fair value | Level 3 | Other Financial Assets    
Financial assets at fair value through profit or loss    
Financial assets 410 328
Fair value | Financial liabilities    
Financial assets at fair value through profit or loss    
Derivatives (235) (418)
Contingent consideration (180) (140)
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 (235) (418)
Contingent consideration 0 0
Fair value | Financial liabilities | Level 3    
Financial assets at fair value through profit or loss    
Derivatives 0 0
Contingent consideration € (180) € (140)