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Financial Instruments - Summary of Financial Assets and Liabilities by Categories (Detail) - EUR (€)
€ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents € 213   € 164 € 269
Trade receivables 521   481  
Other financial assets 26   104  
Total financial assets 760   749  
Trade payables and fixed assets payables 867   715  
Borrowings 2,378 € 2,253 2,151 € 2,127
Other financial liabilities 69   89  
Total financial liabilities 3,314   2,955  
At amortized cost [member]        
Disclosure of detailed information about financial instruments [line items]        
Trade payables and fixed assets payables 867   715  
Borrowings 2,378   2,151  
Total financial liabilities 3,245   2,866  
At fair value through Profit and loss [member]        
Disclosure of detailed information about financial instruments [line items]        
Other financial liabilities 58   79  
Total financial liabilities 58   79  
At fair value through OCI [member]        
Disclosure of detailed information about financial instruments [line items]        
Other financial liabilities 11   10  
Total financial liabilities 11   10  
At amortized cost [member]        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents 213   164  
Other financial assets     74  
Total financial assets 213   238  
At fair value through Profit and loss [member]        
Disclosure of detailed information about financial instruments [line items]        
Other financial assets 26   30  
Total financial assets 26   30  
At fair value through OCI [member]        
Disclosure of detailed information about financial instruments [line items]        
Trade receivables 521   481  
Total financial assets € 521   € 481