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Property, plant and equipment - Summary of Property, Plant and Equipment (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance £ 828 £ 1,001  
Impairment charges included within restructuring costs 2 56 £ 0
Ending balance 909 828 1,001
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 1,616 1,923  
Additions 162 177  
Acquisitions 0 1  
Disposals and derecognition (306) (303)  
Reclassification 0    
Exchange adjustments (125) 182  
Ending balance 1,597 1,616 1,923
Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (788) (922)  
Charge for the year 156 165  
Impairment charges included within restructuring costs 2 56  
Disposals and derecognition 254 288  
Exchange adjustments (4) (67)  
Ending balance (688) (788) (922)
Land      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 12 40  
Ending balance 36 12 40
Land | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 12 40  
Additions 0 4  
Acquisitions 0 0  
Disposals and derecognition (3) 0  
Reclassification (64)    
Exchange adjustments (91) 32  
Ending balance 36 12 40
Land | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 0 0  
Charge for the year 0 0  
Impairment charges included within restructuring costs 0 0  
Disposals and derecognition 0 0  
Exchange adjustments 0 0  
Ending balance 0 0 0
Freehold buildings      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 31 90  
Ending balance 142 31 90
Freehold buildings | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 34 92  
Additions 2 3  
Acquisitions 0 0  
Disposals and derecognition (4) 0  
Reclassification 64    
Exchange adjustments (48) 61  
Ending balance 144 34 92
Freehold buildings | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (3) (2)  
Charge for the year 1 1  
Impairment charges included within restructuring costs 0 0  
Disposals and derecognition 2 0  
Exchange adjustments 0 0  
Ending balance (2) (3) (2)
Leasehold buildings      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 581 647  
Ending balance 519 581 647
Leasehold buildings | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 1,061 1,179  
Additions 69 88  
Acquisitions 0 1  
Disposals and derecognition (158) (156)  
Reclassification 0    
Exchange adjustments 11 51  
Ending balance 961 1,061 1,179
Leasehold buildings | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (480) (532)  
Charge for the year 65 70  
Impairment charges included within restructuring costs 2 52  
Disposals and derecognition 120 145  
Exchange adjustments 15 (29)  
Ending balance (442) (480) (532)
Fixtures, fittings and equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 74 85  
Ending balance 62 74 85
Fixtures, fittings and equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 119 165  
Additions 15 17  
Acquisitions 0 0  
Disposals and derecognition (58) (51)  
Reclassification 0    
Exchange adjustments 7 12  
Ending balance 69 119 165
Fixtures, fittings and equipment | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (45) (80)  
Charge for the year 23 25  
Impairment charges included within restructuring costs 0 3  
Disposals and derecognition 52 49  
Exchange adjustments (9) (14)  
Ending balance (7) (45) (80)
Computer equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 130 139  
Ending balance 150 130 139
Computer equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 390 447  
Additions 76 65  
Acquisitions 0 0  
Disposals and derecognition (83) (96)  
Reclassification 0    
Exchange adjustments (4) 26  
Ending balance 387 390 447
Computer equipment | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (260) (308)  
Charge for the year 67 69  
Impairment charges included within restructuring costs 0 1  
Disposals and derecognition 80 94  
Exchange adjustments (10) (24)  
Ending balance £ (237) £ (260) £ (308)