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Adoption of IFRS 16 - Effects (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of initial application of standards or interpretations [line items]        
Increase in operating cash flow € 3,496 € 4,303 € 5,045  
Decrease in cash flow from financing activities (102) (3,283) € 3,406  
Property, plant, and equipment 5,496 3,553    
Trade and other payables (1,581) (1,491)    
Financial liabilities 16,196 11,678    
Retained earnings 28,783 € 27,407    
Impact of adoption of IFRS 16        
Disclosure of initial application of standards or interpretations [line items]        
Increase in operating cash flow 319      
Decrease in cash flow from financing activities € 319      
Property, plant, and equipment       € 1,900
Trade and other payables       100
Financial liabilities       2,100
Retained earnings       € (100)