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Leases - Summary of Maturity of Lease Liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Leases [Line Items]      
Gross lease liabilities £ 2,692 £ 2,772  
Effect of discounting (672) (618)  
Lease liability at end of year 2,020 2,154 £ 2,210
Short-term lease liability 240 292  
Long-term lease liability 1,780 1,862  
Within one year      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 353 406  
Between one and two years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 307 327  
Between two and three years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 281 282  
Between three and four years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 256 261  
Between four and five years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 235 231  
Over five years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities £ 1,260 £ 1,265