v3.25.4
Subordinated liabilities - Disclosure of dated subordinated liabilities (Details)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
SGD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
GBP (£)
Disclosure of detailed information about borrowings [line items]            
Notional contract amount £ 100,079,291,000,000         £ 83,792,768,000,000
Dated subordinated liabilities 45,699,000,000         42,278,000,000
Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 45,699,000,000         42,278,000,000
Other subsidiaries            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities £ 492,000,000         623,000,000
5.75% Fixed Rate Subordinated Notes | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC externally issued            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.75% 5.75% 5.75% 5.75% 5.75%  
Dated subordinated liabilities £ 279,000,000         279,000,000
5.4% Reverse Dual Currency Subordinated Loan (JPY 15,000m) | Barclays Bank PLC | Barclays Bank PLC externally issued            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.40% 5.40% 5.40% 5.40% 5.40%  
Notional contract amount | ¥   ¥ 15,000,000,000        
Dated subordinated liabilities £ 71,000,000         76,000,000
6.33% Subordinated Notes (GBP 50m) | Barclays Bank PLC | Barclays Bank PLC externally issued            
Disclosure of detailed information about borrowings [line items]            
Interest rate 6.33% 6.33% 6.33% 6.33% 6.33%  
Notional contract amount £ 50,000,000          
Dated subordinated liabilities 46,000,000         45,000,000
Subordinated Floating Rate Notes (EUR 68m) | Floating interest rate | Barclays Bank PLC | Barclays Bank PLC externally issued            
Disclosure of detailed information about borrowings [line items]            
Notional contract amount | €     € 68,000,000      
Dated subordinated liabilities £ 59,000,000         56,000,000
3.75% Fixed Rate Resetting Subordinated Callable Notes (SGD 200m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 3.75% 3.75% 3.75% 3.75% 3.75%  
Notional contract amount | $       $ 200,000,000    
Dated subordinated liabilities £ 0         117,000,000
5.20% Fixed Rate Subordinated Notes (USD 1,367m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.20% 5.20% 5.20% 5.20% 5.20%  
Notional contract amount | $         $ 1,367,000,000  
Dated subordinated liabilities £ 1,015,000,000         1,051,000,000
1.125% Fixed Rate Resetting Subordinated Callable Notes (EUR 1,000m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 1.125% 1.125% 1.125% 1.125% 1.125%  
Notional contract amount | €     € 1,000,000,000      
Dated subordinated liabilities £ 876,000,000         810,000,000
4.836% Fixed Rate Subordinated Notes (USD 1,200m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.836% 4.836% 4.836% 4.836% 4.836%  
Notional contract amount | $         $ 1,200,000,000  
Dated subordinated liabilities £ 883,000,000         920,000,000
8.407% Fixed Rate Resetting Subordinated Callable Loan (GBP 1,000m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 8.407% 8.407% 8.407% 8.407% 8.407%  
Notional contract amount £ 1,000,000,000          
Dated subordinated liabilities £ 1,022,000,000         1,008,000,000
5.088% Fixed-to-Floating Rate Subordinated Callable Notes (USD 1,300m) | Fixed-to-Floating Interest Rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.088% 5.088% 5.088% 5.088% 5.088%  
Notional contract amount | $         $ 1,300,000,000  
Dated subordinated liabilities £ 920,000,000         941,000,000
4.973% Fixed Rate Resetting Subordinated Callable Notes (EUR 1,500m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.973% 4.973% 4.973% 4.973% 4.973%  
Notional contract amount | €     € 1,500,000,000      
Dated subordinated liabilities £ 1,367,000,000         1,320,000,000
7.437% Fixed Rate Resetting Subordinated Callable Notes (USD 2,000m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 7.437% 7.437% 7.437% 7.437% 7.437%  
Notional contract amount | $         $ 2,000,000,000  
Dated subordinated liabilities £ 1,514,000,000         1,573,000,000
4.616% Fixed Rate Resetting Subordinated Callable Notes (EUR 800m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.616% 4.616% 4.616% 4.616% 4.616%  
Notional contract amount | €     € 800,000,000      
Dated subordinated liabilities £ 719,000,000         0
5.262% Fixed Rate Resetting Subordinated Callable Notes (EUR 1,250m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.262% 5.262% 5.262% 5.262% 5.262%  
Notional contract amount | €     € 1,250,000,000      
Dated subordinated liabilities £ 1,162,000,000         1,130,000,000
7.119% Fixed-to-Floating Rate Subordinated Callable Notes (USD 860m) | Fixed-to-Floating Interest Rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 7.119% 7.119% 7.119% 7.119% 7.119%  
Notional contract amount | $         $ 860,000,000  
Dated subordinated liabilities £ 632,000,000         655,000,000
3.811% Fixed Rate Resetting Subordinated Callable Notes (USD 1,000m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 3.811% 3.811% 3.811% 3.811% 3.811%  
Notional contract amount | $         $ 1,000,000,000  
Dated subordinated liabilities £ 558,000,000         586,000,000
5.25% Fixed Rate Subordinated Notes (USD 827m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 5.25% 5.25% 5.25% 5.25% 5.25%  
Notional contract amount | $         $ 827,000,000  
Dated subordinated liabilities £ 382,000,000         408,000,000
4.95% Fixed Rate Subordinated Notes (USD 1,250m) | Fixed interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Interest rate 4.95% 4.95% 4.95% 4.95% 4.95%  
Notional contract amount | $         $ 1,250,000,000  
Dated subordinated liabilities £ 510,000,000         556,000,000
Floating Rate Subordinated Notes (USD 456m) | Floating interest rate | Barclays Bank PLC | Barclays Bank PLC            
Disclosure of detailed information about borrowings [line items]            
Notional contract amount | $         $ 456,000,000  
Dated subordinated liabilities 345,000,000         370,000,000
Various subordinated loans            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 32,847,000,000         29,754,000,000
Various subordinated loans | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 0         334,000,000
Various subordinated loans | Floating interest rate | Callable            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 2,663,000,000         1,025,000,000
Various subordinated loans | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 2,557,000,000         3,457,000,000
Various subordinated loans | Fixed interest rate | Callable            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities 27,121,000,000         24,401,000,000
Various Zero Coupon Callable Loans | Callable            
Disclosure of detailed information about borrowings [line items]            
Dated subordinated liabilities £ 506,000,000         £ 537,000,000