v3.25.4
Risk Management - Disclosure of maturity analysis of off-balance sheet commitments given (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees £ 26,633 £ 26,565
Documentary credits and other short-term trade related transactions 1,103 1,433
Standby facilities, credit lines and other commitments 354,285 352,344
Total off-balance sheet commitments given 382,021 380,342
Not more than one month    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 26,631 26,541
Documentary credits and other short-term trade related transactions 1,103 1,432
Standby facilities, credit lines and other commitments 354,202 352,276
Total off-balance sheet commitments given 381,936 380,249
Over one month but not more than three months    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 0 22
Documentary credits and other short-term trade related transactions 0 1
Standby facilities, credit lines and other commitments 0 0
Total off-balance sheet commitments given 0 23
Over three months but not more than six months    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 1 1
Documentary credits and other short-term trade related transactions 0 0
Standby facilities, credit lines and other commitments 0 0
Total off-balance sheet commitments given 1 1
Over six months but not more than one year    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 1 1
Documentary credits and other short-term trade related transactions 0 0
Standby facilities, credit lines and other commitments 0 0
Total off-balance sheet commitments given 1 1
Over one year but not more than three years    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 0 0
Documentary credits and other short-term trade related transactions 0 0
Standby facilities, credit lines and other commitments 63 68
Total off-balance sheet commitments given 63 68
Over three years but not more than five years    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 0 0
Documentary credits and other short-term trade related transactions 0 0
Standby facilities, credit lines and other commitments 17 0
Total off-balance sheet commitments given 17 0
Over five years    
Disclosure of contingent liabilities [line items]    
Contingent liabilities and financial guarantees 0 0
Documentary credits and other short-term trade related transactions 0 0
Standby facilities, credit lines and other commitments 3 0
Total off-balance sheet commitments given £ 3 £ 0