v3.10.0.1
Provisions - Summary of Changes in Groups Provisions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Provisions [Line Items]    
Beginning balance ,Carrying amount € 65 € 61
Charged/(credited) to the consolidated statement of operations:    
Additional provisions 7 67
Reversal of unutilized amounts   (1)
Exchange differences 3 (11)
Utilized (25) (51)
Ending balance ,Carrying amount 50 65
Current portion 42 59
Non-current portion 8 6
Legal Contingencies    
Disclosure Of Other Provisions [Line Items]    
Beginning balance ,Carrying amount 53 49
Charged/(credited) to the consolidated statement of operations:    
Additional provisions 0 60
Reversal of unutilized amounts   0
Exchange differences 3 (11)
Utilized (17) (45)
Ending balance ,Carrying amount 39 53
Current portion 39 53
Non-current portion 0 0
Other Provisions    
Disclosure Of Other Provisions [Line Items]    
Beginning balance ,Carrying amount 12 12
Charged/(credited) to the consolidated statement of operations:    
Additional provisions 7 7
Reversal of unutilized amounts   (1)
Exchange differences 0 0
Utilized (8) (6)
Ending balance ,Carrying amount 11 12
Current portion 3 6
Non-current portion € 8 € 6