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Revenue recognition - Geographic (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Geographical information      
Net sales € 23,315 € 22,563 € 23,147
Satisfied performance obligations 1,900 1,700  
Asia Pacific      
Geographical information      
Net sales 4,556 4,081 4,228
Europe      
Geographical information      
Net sales 6,620 6,489 6,833
Greater China      
Geographical information      
Net sales 1,843 2,165 2,516
Latin America      
Geographical information      
Net sales 1,472 1,380 1,279
Middle East and Africa      
Geographical information      
Net sales 1,876 1,874 1,907
North America      
Geographical information      
Net sales € 6,948 € 6,574 € 6,384