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Provisions - Summary of Changes in Provisions (Detail) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Beginning balance € 153  
Transfer from provision to contract liability (23)  
Allowance 8  
Amounts used (6)  
Unused amounts reversed (1)  
Unwinding of discounts (1)  
Effects of changes in foreign exchange rates 2  
Transfer 4  
Ending balance 136  
Current 40 € 40
Non-Current 96 € 113
Close down and environmental remediation costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 81  
Allowance 1  
Amounts used (1)  
Unwinding of discounts (1)  
Effects of changes in foreign exchange rates 1  
Ending balance 81  
Current 5  
Non-Current 76  
Restructuring costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 5  
Amounts used (1)  
Ending balance 4  
Current 2  
Non-Current 2  
Legal claims and other costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 67  
Transfer from provision to contract liability (23)  
Allowance 7  
Amounts used (4)  
Unused amounts reversed (1)  
Effects of changes in foreign exchange rates 1  
Transfer 4  
Ending balance 51  
Current 33  
Non-Current € 18