v3.19.3.a.u2
Goodwill and Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets € 28  
Exchange differences 1  
Ending balance, intangible assets 58 € 28
Beginning balance 174  
Ending balance 536 174
Goodwill    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance 146  
Ending balance 478 146
Cost    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets 47 35
Additions 19 8
Acquisition, business combination (Note 5) 27 3
Amortization charge 0  
Exchange differences (1) 1
Ending balance, intangible assets 92 47
Beginning balance 193 170
Additions 19 8
Acquisition, business combination (Note 5) 355 11
Exchange differences 3 4
Ending balance 570 193
Cost | Goodwill    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance 146 135
Additions 0 0
Acquisition, business combination (Note 5) 328 8
Exchange differences 4 3
Ending balance 478 146
Accumulated Depreciation    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets (19) (8)
Amortization charge (16) (11)
Exchange differences 1  
Ending balance, intangible assets (34) (19)
Beginning balance (19) (8)
Ending balance (34) (19)
Internal development costs and patents    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets 14  
Ending balance, intangible assets 26 14
Internal development costs and patents | Cost    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets 26 18
Additions 19 8
Acquisition, business combination (Note 5) 0 0
Amortization charge 0  
Exchange differences 0 0
Ending balance, intangible assets 45 26
Internal development costs and patents | Accumulated Depreciation    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets (12) (6)
Amortization charge (7) (6)
Exchange differences 0  
Ending balance, intangible assets (19) (12)
Acquired intangible assets    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets 14  
Ending balance, intangible assets 32 14
Acquired intangible assets | Cost    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets 21 17
Additions 0 0
Acquisition, business combination (Note 5) 27 3
Amortization charge 0  
Exchange differences (1) 1
Ending balance, intangible assets 47 21
Acquired intangible assets | Accumulated Depreciation    
Disclosure Of Reconciliation Of Changes In Intangible Assets And Goodwill [Line Items]    
Beginning balance, intangible assets (7) (2)
Amortization charge (9) (5)
Exchange differences 1  
Ending balance, intangible assets € (15) € (7)