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Inventories - Narrative (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of assets and liabilities classified as held for sale [Line Items]    
Inventories carried at net realisable value € 163 € 204
Total expense towards inventory write downs and losses 281 381
Inventories 4,683 4,462
Disposal Groups Held for Sale    
Disclosure of assets and liabilities classified as held for sale [Line Items]    
Inventories 258 € 6
Disposal Groups Held for Sale | ekaterra    
Disclosure of assets and liabilities classified as held for sale [Line Items]    
Inventories € 258