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Other assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other assets    
Interests in associates £ 668 £ 688
Property, plant and equipment 4,227 4,240
Pension schemes in net surplus 201 318
Prepayments 350 340
Accrued income 292 327
Tax recoverable 49 279
Deferred tax 1,894 2,178
Acceptances 575 237
Other 504 569
Other assets £ 8,760 9,176
Freehold buildings and long leaseholds    
Other assets    
Useful life measured as period of time, property, plant and equipment 50 years  
Short leaseholds for unexpired period of lease and property adaption costs | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 15 years  
Short leaseholds for unexpired period of lease and property adaption costs | Minimum    
Other assets    
Useful life measured as period of time, property, plant and equipment 10 years  
Computers equipment | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 5 years  
Other equipment | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 15 years  
Other equipment | Minimum    
Other assets    
Useful life measured as period of time, property, plant and equipment 4 years  
Business Growth Fund    
Other assets    
Interests in associates £ 658 £ 677