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Property and equipment - Summary of Property and Equipment (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance € 313  
Ending balance 372 € 313
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 402 349
Additions 81 79
Disposals (2) (2)
Exchange differences 24 (24)
Ending balance 505 402
Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (89) (58)
Depreciation charge (41) (37)
Disposals 2 1
Exchange differences (5) 5
Ending balance (133) (89)
Property and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 20  
Ending balance 37 20
Property and Equipment | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 56 54
Additions 26 6
Disposals (1) (1)
Exchange differences 2 (3)
Ending balance 83 56
Property and Equipment | Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (36) (29)
Depreciation charge (9) (9)
Disposals 1 0
Exchange differences (2) 2
Ending balance (46) (36)
Leasehold Improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 293  
Ending balance 335 293
Leasehold Improvements | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 346 295
Additions 55 73
Disposals (1) (1)
Exchange differences 22 (21)
Ending balance 422 346
Leasehold Improvements | Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (53) (29)
Depreciation charge (32) (28)
Disposals 1 1
Exchange differences (3) 3
Ending balance € (87) € (53)