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Goodwill and intangible assets - Summary of Goodwill and Intangible Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets € 97  
Ending balance, intangible assets 89 € 97
Beginning balance 833  
Ending balance 983 833
Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 736  
Ending balance 894 736
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 155 92
Additions 13 19
Acquisition, business combination (Note 5) 7 48
Write-off of fully amortized intangible assets (13)  
Exchange differences 7 (4)
Ending balance, intangible assets 169 155
Beginning balance 891 570
Additions 13 19
Acquisition, business combination (Note 5) 113 352
Write-off of fully amortized intangible assets (13)  
Exchange differences 59 (50)
Ending balance 1,063 891
Cost | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 736 478
Additions 0 0
Acquisition, business combination (Note 5) 106 304
Write-off of fully amortized intangible assets 0  
Exchange differences 52 (46)
Ending balance 894 736
Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (58) (34)
Write-off of fully amortized intangible assets 13  
Amortization charge (33) (25)
Exchange differences (2) 1
Ending balance, intangible assets (80) (58)
Beginning balance (58) (34)
Write-off of fully amortized intangible assets 13  
Exchange differences (2) 1
Ending balance (80) (58)
Accumulated Depreciation | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Amortization charge 0 0
Beginning balance 0 0
Write-off of fully amortized intangible assets 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 33  
Ending balance, intangible assets 31 33
Internal Development Costs And Patents | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 64 45
Additions 13 19
Acquisition, business combination (Note 5) 0 0
Write-off of fully amortized intangible assets (13)  
Exchange differences 0 0
Ending balance, intangible assets 64 64
Internal Development Costs And Patents | Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (31) (19)
Write-off of fully amortized intangible assets 13  
Amortization charge (15) (12)
Exchange differences 0 0
Ending balance, intangible assets (33) (31)
Acquired Intangible Assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 64  
Ending balance, intangible assets 58 64
Acquired Intangible Assets | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets 91 47
Additions 0 0
Acquisition, business combination (Note 5) 7 48
Write-off of fully amortized intangible assets 0  
Exchange differences 7 (4)
Ending balance, intangible assets 105 91
Acquired Intangible Assets | Accumulated Depreciation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance, intangible assets (27) (15)
Write-off of fully amortized intangible assets 0  
Amortization charge (18) (13)
Exchange differences (2) 1
Ending balance, intangible assets € (47) € (27)