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Financial Instruments - Summary of Financial Assets and Liabilities by Categories (Detail) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents € 166 € 269 € 347
Trade receivables 526 306  
Finance lease receivables 9 12  
Other financial assets 120 179  
Total financial assets 821 766  
Trade payables and fixed assets payables 863 744  
Borrowings 2,184 2,127 € 2,468
Other financial liabilities 57 66  
Total financial liabilities 3,104 2,937  
At amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Trade payables and fixed assets payables 863 744  
Borrowings 2,184 2,127  
Total financial liabilities 3,047 2,871  
At fair value through Profit and loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 56 66  
Total financial liabilities 56 66  
At fair value through OCI [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 1    
Total financial liabilities 1    
At amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 166    
Finance lease receivables 9    
Other financial assets 76    
Total financial assets 251    
At fair value through Profit and loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Other financial assets 37 77  
Total financial assets 37 77  
At fair value through OCI [member]      
Disclosure of detailed information about financial instruments [line items]      
Trade receivables 526    
Other financial assets 7 19  
Total financial assets € 533 19  
Loans and receivables [member]      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents   269  
Trade receivables   306  
Finance lease receivables   12  
Other financial assets   83  
Total financial assets   € 670