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Provisions - Summary of Changes in Provisions (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Beginning balance € 153 € 149
Transfer from provision to contract liability (23)  
Allowance 19 25
Amounts used (8) (7)
Unused amounts reversed (7) (5)
Unwinding of discounts (1) (1)
Effects of changes in foreign exchange rates 3 (8)
Transfer 4  
Ending balance 140 153
Current 46 40
Non-Current 94 113
Close down and environmental remediation costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 81 88
Allowance 3 3
Amounts used (2) (2)
Unwinding of discounts (1) (1)
Effects of changes in foreign exchange rates 2 (7)
Ending balance 83 81
Current 5 4
Non-Current 78 77
Restructuring costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 5 5
Allowance 1 3
Amounts used (2) (2)
Unused amounts reversed (1) (1)
Ending balance 3 5
Current 1 3
Non-Current 2 2
Legal claims and other costs [member]    
Disclosure of other provisions [line items]    
Beginning balance 67 56
Transfer from provision to contract liability (23)  
Allowance 15 19
Amounts used (4) (3)
Unused amounts reversed (6) (4)
Effects of changes in foreign exchange rates 1 (1)
Transfer 4  
Ending balance 54 67
Current 40 33
Non-Current € 14 € 34