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Goodwill and intangible assets - Summary of Goodwill and Intangible Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets € 58  
Ending balance, intangible assets 97 € 58
Beginning balance 536  
Ending balance 833 536
Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 478  
Ending balance 736 478
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 92 47
Additions 19 19
Acquisition, business combination (Note 5) 48 27
Exchange differences (4) (1)
Ending balance, intangible assets 155 92
Beginning balance 570 193
Additions 19 19
Acquisition, business combination (Note 5) 352 355
Exchange differences (50) 3
Ending balance 891 570
Cost | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 478 146
Additions 0 0
Acquisition, business combination (Note 5) 304 328
Exchange differences (46) 4
Ending balance 736 478
Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (34) (19)
Amortization charge (25) (16)
Exchange differences 1 1
Ending balance, intangible assets (58) (34)
Beginning balance (34) (19)
Exchange differences 1 1
Ending balance (58) (34)
Accumulated Depreciation | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Amortization charge 0 0
Beginning balance 0 0
Exchange differences 0 0
Ending balance 0 0
Internal Development Costs And Patents    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 26  
Ending balance, intangible assets 33 26
Internal Development Costs And Patents | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 45 26
Additions 19 19
Acquisition, business combination (Note 5) 0 0
Exchange differences 0 0
Ending balance, intangible assets 64 45
Internal Development Costs And Patents | Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (19) (12)
Amortization charge (12) (7)
Exchange differences 0 0
Ending balance, intangible assets (31) (19)
Acquired Intangible Assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 32  
Ending balance, intangible assets 64 32
Acquired Intangible Assets | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 47 21
Additions 0 0
Acquisition, business combination (Note 5) 48 27
Exchange differences (4) (1)
Ending balance, intangible assets 91 47
Acquired Intangible Assets | Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (15) (7)
Amortization charge (13) (9)
Exchange differences 1 1
Ending balance, intangible assets € (27) € (15)