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Property and equipment - Summary of Property and Equipment (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance € 291,000,000  
Impairment charge 0 € (6,000,000)
Ending balance 313,000,000 291,000,000
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 349,000,000 277,000,000
Additions 79,000,000 126,000,000
Acquired in business combinations   6,000,000
Disposals (2,000,000) (67,000,000)
Exchange differences (24,000,000) 7,000,000
Ending balance 402,000,000 349,000,000
Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (58,000,000) (80,000,000)
Depreciation charge (37,000,000) (29,000,000)
Impairment charge   (6,000,000)
Disposals 1,000,000 58,000,000
Exchange differences 5,000,000 (1,000,000)
Ending balance (89,000,000) (58,000,000)
Property and Equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 25,000,000  
Ending balance 20,000,000 25,000,000
Property and Equipment | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 54,000,000 61,000,000
Additions 6,000,000 20,000,000
Acquired in business combinations   1,000,000
Disposals (1,000,000) (29,000,000)
Exchange differences (3,000,000) 1,000,000
Ending balance 56,000,000 54,000,000
Property and Equipment | Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (29,000,000) (50,000,000)
Depreciation charge (9,000,000) (8,000,000)
Impairment charge   0
Disposals 0 30,000,000
Exchange differences 2,000,000 (1,000,000)
Ending balance (36,000,000) (29,000,000)
Leasehold Improvements    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 266,000,000  
Ending balance 293,000,000 266,000,000
Leasehold Improvements | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 295,000,000 216,000,000
Additions 73,000,000 106,000,000
Acquired in business combinations   5,000,000
Disposals (1,000,000) (38,000,000)
Exchange differences (21,000,000) 6,000,000
Ending balance 346,000,000 295,000,000
Leasehold Improvements | Accumulated Depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (29,000,000) (30,000,000)
Depreciation charge (28,000,000) (21,000,000)
Impairment charge   (6,000,000)
Disposals 1,000,000 28,000,000
Exchange differences 3,000,000 0
Ending balance € (53,000,000) € (29,000,000)