v3.26.1
SECURITISATIONS AND COVERED BONDS - Additional Information (Details)
£ in Millions, € in Billions
1 Months Ended
Jan. 31, 2025
GBP (£)
Jun. 30, 2026
GBP (£)
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
EUR (€)
Jun. 30, 2025
EUR (€)
Disclosure Of Securitisations And Covered Bonds [Line Items]            
Notional amount   £ 341,548   £ 266,336    
£10bn Global Covered Bond Programme            
Disclosure Of Securitisations And Covered Bonds [Line Items]            
Notional amount   £ 10,000   £ 10,000    
Euro €35bn Global Covered Bond Programme            
Disclosure Of Securitisations And Covered Bonds [Line Items]            
Notional amount | €     € 35   € 35 € 35
Mortgage-backed master trust structures: | External | Fosse            
Disclosure Of Securitisations And Covered Bonds [Line Items]            
Mortgage backed notes sold £ 200