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Provisions - Summary of Changes in Provisions (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]    
Beginning balance € 149 € 163
Allowance 25 13
Amounts used (7) (11)
Unused amounts reversed (5) (16)
Unwinding of discounts (1) 1
Reclassified to Pension liabilities   (3)
Effects of changes in foreign exchange rates (8) 2
Ending balance 153 149
Current 40 42
Non-Current 113 107
Close down and environmental remediation costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 88 88
Allowance 3  
Amounts used (2) (2)
Unused amounts reversed   (1)
Unwinding of discounts (1) 1
Effects of changes in foreign exchange rates (7) 2
Ending balance 81 88
Current 4 3
Non-Current 77 85
Restructuring costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 5 8
Allowance 3 6
Amounts used (2) (5)
Unused amounts reversed (1) (1)
Reclassified to Pension liabilities   (3)
Ending balance 5 5
Current 3 3
Non-Current 2 2
Legal claims and other costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 56 67
Allowance 19 7
Amounts used (3) (4)
Unused amounts reversed (4) (14)
Effects of changes in foreign exchange rates (1)  
Ending balance 67 56
Current 33 36
Non-Current € 34 € 20