v3.25.4
Allowance for expected credit losses - Disclosure of Generation of Multiple Economic Assumptions by Quarter and by Year (Details)
Dec. 31, 2025
Dec. 31, 2024
Upside | Weighted average    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.80% 1.60%
Unemployment rate 3.70% 3.20%
House price growth 4.80% 5.10%
Commercial real estate price growth 3.20% 3.70%
UK Bank Rate 4.61% 5.08%
CPI inflation 2.90% 2.80%
Base case | Weighted average    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 1.20%
Unemployment rate 4.80% 4.50%
House price growth 1.90% 2.00%
Commercial real estate price growth 0.90% 1.10%
UK Bank Rate 3.55% 3.98%
CPI inflation 2.60% 2.50%
Downside | Weighted average    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.50%
Unemployment rate 6.70% 6.40%
House price growth (2.60%) (2.40%)
Commercial real estate price growth (3.10%) (2.70%)
UK Bank Rate 1.85% 2.36%
CPI inflation 2.10% 2.10%
Severe downside | Weighted average    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.00% (0.10%)
Unemployment rate 8.50% 8.40%
House price growth (6.50%) (6.70%)
Commercial real estate price growth (8.00%) (7.50%)
UK Bank Rate 1.24%  
CPI inflation 1.60%  
UK Bank Rate – modelled   1.62%
UK Bank Rate - adjusted   3.19%
CPI inflation – modelled   1.70%
CPI inflation - adjusted   2.10%
Probability-weighted | Weighted average    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.20% 1.00%
Unemployment rate 5.40% 5.10%
House price growth 0.60% 0.80%
Commercial real estate price growth (0.40%) (0.10%)
UK Bank Rate 3.13%  
CPI inflation 2.40%  
UK Bank Rate – modelled   3.59%
UK Bank Rate - adjusted   3.74%
CPI inflation – modelled   2.40%
CPI inflation - adjusted   2.40%
Upside | Start to peak    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 9.40% 8.90%
Unemployment rate 5.10% 4.40%
House price growth 26.40% 28.20%
Commercial real estate price growth 17.30% 20.00%
UK Bank Rate 5.39% 5.50%
CPI inflation 3.80% 3.50%
Upside | Start to trough    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.70%
Unemployment rate 3.00% 2.70%
House price growth (0.10%) 0.40%
Commercial real estate price growth 0.60% (0.80%)
UK Bank Rate 3.75% 4.50%
CPI inflation 2.10% 2.00%
Base case | Start to peak    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 7.60% 7.00%
Unemployment rate 5.30% 4.80%
House price growth 9.80% 10.50%
Commercial real estate price growth 4.40% 5.40%
UK Bank Rate 4.50% 5.25%
CPI inflation 3.80% 3.50%
Base case | Start to trough    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.70%
Unemployment rate 4.50% 4.20%
House price growth (0.10%) 0.40%
Commercial real estate price growth 0.60% (0.80%)
UK Bank Rate 3.25% 3.50%
CPI inflation 2.10% 2.00%
Downside | Start to peak    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 3.60% 3.20%
Unemployment rate 7.60% 7.50%
House price growth 0.90% 4.00%
Commercial real estate price growth 1.30% 0.70%
UK Bank Rate 4.50% 5.25%
CPI inflation 3.80% 3.50%
Downside | Start to trough    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.10% 0.00%
Unemployment rate 4.50% 4.20%
House price growth (12.20%) (11.40%)
Commercial real estate price growth (14.40%) (12.90%)
UK Bank Rate 0.45% 0.59%
CPI inflation 0.80% 0.90%
Severe downside | Start to peak    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.30% 1.20%
Unemployment rate 10.30% 10.20%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.30% 0.70%
UK Bank Rate 4.50%  
CPI inflation 3.80%  
UK Bank Rate – modelled   5.25%
UK Bank Rate - adjusted   5.25%
CPI inflation – modelled   3.50%
CPI inflation - adjusted   3.90%
Severe downside | Start to trough    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth (2.80%) (2.40%)
Unemployment rate 4.50% 4.20%
House price growth (28.40%) (29.20%)
Commercial real estate price growth (34.00%) (32.30%)
UK Bank Rate 0.01%  
CPI inflation (0.70%)  
UK Bank Rate – modelled   0.02%
UK Bank Rate - adjusted   1.88%
CPI inflation – modelled   (0.20%)
CPI inflation - adjusted   0.70%
Probability-weighted | Start to peak    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 6.10% 5.70%
Unemployment rate 5.80% 5.50%
House price growth 2.80% 5.30%
Commercial real estate price growth 1.30% 0.70%
UK Bank Rate 4.50%  
CPI inflation 3.80%  
UK Bank Rate – modelled   5.25%
UK Bank Rate - adjusted   5.25%
CPI inflation – modelled   3.50%
CPI inflation - adjusted   3.50%
Probability-weighted | Start to trough    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.70%
Unemployment rate 4.50% 4.20%
House price growth (0.10%) 0.40%
Commercial real estate price growth (2.60%) (1.30%)
UK Bank Rate 2.64%  
CPI inflation 1.80%  
UK Bank Rate – modelled   2.88%
UK Bank Rate - adjusted   3.06%
CPI inflation – modelled   1.80%
CPI inflation - adjusted   1.90%
2025 % | Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 0.80%
Unemployment rate 4.80% 4.30%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 4.13% 5.06%
CPI inflation 3.40% 2.60%
2025 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 0.80%
Unemployment rate 4.80% 4.30%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 4.13% 5.06%
CPI inflation 3.40% 2.60%
2025 % | Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 0.80%
Unemployment rate 4.80% 4.30%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 4.13% 5.06%
CPI inflation 3.40% 2.60%
2025 % | Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 0.80%
Unemployment rate 4.80% 4.30%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 4.13%  
CPI inflation 3.40%  
UK Bank Rate – modelled   5.06%
UK Bank Rate - adjusted   5.06%
CPI inflation – modelled   2.60%
CPI inflation - adjusted   2.60%
2025 % | Probability-weighted    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 0.80%
Unemployment rate 4.80% 4.30%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 4.13%  
CPI inflation 3.40%  
UK Bank Rate – modelled   5.06%
UK Bank Rate - adjusted   5.06%
CPI inflation – modelled   2.60%
CPI inflation - adjusted   2.60%
2026 % | Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 2.00% 1.90%
Unemployment rate 4.20% 3.50%
House price growth 3.50% 3.70%
Commercial real estate price growth 7.90% 7.80%
UK Bank Rate 3.94% 4.71%
CPI inflation 2.60% 2.80%
2026 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.20% 1.00%
Unemployment rate 5.20% 4.70%
House price growth 1.60% 2.10%
Commercial real estate price growth 0.60% 0.30%
UK Bank Rate 3.44% 4.19%
CPI inflation 2.60% 2.80%
2026 % | Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth (0.30%) (0.50%)
Unemployment rate 6.60% 6.00%
House price growth (0.20%) 0.60%
Commercial real estate price growth (7.10%) (7.80%)
UK Bank Rate 2.74% 3.53%
CPI inflation 2.60% 2.80%
2026 % | Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth (1.90%) (1.90%)
Unemployment rate 8.30% 7.70%
House price growth (1.20%) (0.80%)
Commercial real estate price growth (17.40%) (17.40%)
UK Bank Rate 1.91%  
CPI inflation 2.60%  
UK Bank Rate – modelled   2.68%
UK Bank Rate - adjusted   4.03%
CPI inflation – modelled   2.80%
CPI inflation - adjusted   3.60%
2026 % | Probability-weighted    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.50%
Unemployment rate 5.60% 5.00%
House price growth 1.30% 1.80%
Commercial real estate price growth (1.30%) (1.70%)
UK Bank Rate 3.23%  
CPI inflation 2.60%  
UK Bank Rate – modelled   4.00%
UK Bank Rate - adjusted   4.13%
CPI inflation – modelled   2.80%
CPI inflation - adjusted   2.90%
2027 % | Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 2.30% 2.20%
Unemployment rate 3.20% 2.80%
House price growth 7.10% 6.50%
Commercial real estate price growth 4.90% 6.70%
UK Bank Rate 4.59% 5.02%
CPI inflation 2.40% 2.60%
2027 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 1.40%
Unemployment rate 4.80% 4.70%
House price growth 1.90% 1.00%
Commercial real estate price growth 1.70% 2.50%
UK Bank Rate 3.25% 3.63%
CPI inflation 2.20% 2.40%
2027 % | Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth (0.50%) (0.40%)
Unemployment rate 7.50% 7.40%
House price growth (4.70%) (5.50%)
Commercial real estate price growth (4.20%) (3.10%)
UK Bank Rate 1.09% 1.56%
CPI inflation 2.00% 2.30%
2027 % | Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth (1.80%) (1.50%)
Unemployment rate 10.20% 10.00%
House price growth (11.10%) (12.40%)
Commercial real estate price growth (9.80%) (8.50%)
UK Bank Rate 0.10%  
CPI inflation 1.70%  
UK Bank Rate – modelled   0.28%
UK Bank Rate - adjusted   2.70%
CPI inflation – modelled   1.90%
CPI inflation - adjusted   2.10%
2027 % | Probability-weighted    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.80% 0.80%
Unemployment rate 5.70% 5.50%
House price growth 0.20% (0.70%)
Commercial real estate price growth (0.30%) 1.00%
UK Bank Rate 2.69%  
CPI inflation 2.20%  
UK Bank Rate – modelled   3.09%
UK Bank Rate - adjusted   3.33%
CPI inflation – modelled   2.40%
CPI inflation - adjusted   2.40%
2028 % | Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.60% 1.50%
Unemployment rate 3.10% 2.70%
House price growth 6.90% 6.60%
Commercial real estate price growth 1.70% 3.20%
UK Bank Rate 5.07% 5.19%
CPI inflation 2.80% 2.90%
2028 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.50% 1.50%
Unemployment rate 4.60% 4.50%
House price growth 2.20% 1.40%
Commercial real estate price growth 0.50% 1.90%
UK Bank Rate 3.44% 3.50%
CPI inflation 2.20% 2.40%
2028 % | Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.10% 1.00%
Unemployment rate 7.40% 7.40%
House price growth (5.70%) (6.60%)
Commercial real estate price growth (2.70%) (0.90%)
UK Bank Rate 0.75% 0.96%
CPI inflation 1.40% 1.80%
2028 % | Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.70%
Unemployment rate 9.90% 10.00%
House price growth (12.20%) (13.60%)
Commercial real estate price growth (7.40%) (5.50%)
UK Bank Rate 0.03%  
CPI inflation 0.50%  
UK Bank Rate – modelled   0.08%
UK Bank Rate - adjusted   2.23%
CPI inflation – modelled   1.00%
CPI inflation - adjusted   1.40%
2028 % | Probability-weighted    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.30% 1.20%
Unemployment rate 5.50% 5.40%
House price growth (0.20%) (1.00%)
Commercial real estate price growth (0.90%) 0.70%
UK Bank Rate 2.78%  
CPI inflation 2.00%  
UK Bank Rate – modelled   2.90%
UK Bank Rate - adjusted   3.12%
CPI inflation – modelled   2.20%
CPI inflation - adjusted   2.30%
2029 % | Upside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.60% 1.40%
Unemployment rate 3.20% 2.80%
House price growth 6.00% 5.40%
Commercial real estate price growth 0.80% 0.50%
UK Bank Rate 5.33% 5.42%
CPI inflation 3.10% 3.00%
2029 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.60% 1.50%
Unemployment rate 4.50% 4.50%
House price growth 3.10% 2.40%
Commercial real estate price growth 0.20% 0.00%
UK Bank Rate 3.50% 3.50%
CPI inflation 2.30% 2.20%
2029 % | Downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.60% 1.50%
Unemployment rate 7.00% 7.10%
House price growth (2.80%) (3.40%)
Commercial real estate price growth (2.30%) (2.30%)
UK Bank Rate 0.52% 0.68%
CPI inflation 1.00% 1.20%
2029 % | Severe downside    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.40% 1.30%
Unemployment rate 9.40% 9.70%
House price growth (7.80%) (8.80%)
Commercial real estate price growth (5.40%) (5.70%)
UK Bank Rate 0.01%  
CPI inflation (0.40%)  
UK Bank Rate – modelled   0.02%
UK Bank Rate - adjusted   1.95%
CPI inflation – modelled   0.10%
CPI inflation - adjusted   0.80%
2029 % | Probability-weighted    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 1.60% 1.40%
Unemployment rate 5.40% 5.30%
House price growth 1.10% 0.40%
Commercial real estate price growth (0.90%) (1.10%)
UK Bank Rate 2.81%  
CPI inflation 1.90%  
UK Bank Rate – modelled   2.88%
UK Bank Rate - adjusted   3.08%
CPI inflation – modelled   1.90%
CPI inflation - adjusted   2.00%
First quarter 2025 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.70% 0.70%
Unemployment rate 4.50% 4.30%
House price growth 2.90% 0.40%
Commercial real estate price growth 2.50% (5.30%)
UK Bank Rate 4.50% 5.25%
CPI inflation 2.80% 3.50%
Second quarter 2025 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.30% 0.40%
Unemployment rate 4.70% 4.20%
House price growth 2.70% 1.80%
Commercial real estate price growth 2.60% (4.70%)
UK Bank Rate 4.25% 5.25%
CPI inflation 3.50% 2.10%
Third quarter 2025 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.10% 0.00%
Unemployment rate 5.00% 4.30%
House price growth 1.30% 4.60%
Commercial real estate price growth 2.60% (2.80%)
UK Bank Rate 4.00% 5.00%
CPI inflation 3.80% 2.00%
Fourth quarter 2025 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.30% 0.10%
Unemployment rate 5.10% 4.40%
House price growth 0.80% 3.40%
Commercial real estate price growth 1.20% 0.70%
UK Bank Rate 3.75% 4.75%
CPI inflation 3.70% 2.50%
First quarter 2026 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.30% 0.20%
Unemployment rate 5.30% 4.50%
House price growth 1.30% 3.60%
Commercial real estate price growth 0.50% 1.80%
UK Bank Rate 3.75% 4.50%
CPI inflation 3.30% 2.40%
Second quarter 2026 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.30% 0.30%
Unemployment rate 5.30% 4.60%
House price growth 1.60% 4.00%
Commercial real estate price growth 0.20% 1.40%
UK Bank Rate 3.50% 4.25%
CPI inflation 2.60% 3.00%
Third quarter 2026 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.40% 0.30%
Unemployment rate 5.20% 4.70%
House price growth 1.60% 3.00%
Commercial real estate price growth 0.10% 0.90%
UK Bank Rate 3.25% 4.00%
CPI inflation 2.20% 2.90%
Fourth quarter 2026 % | Base case    
Schedule Of Allowance Account For Credit Losses Of Financial Assets [Line Items]    
Gross domestic product growth 0.40% 0.30%
Unemployment rate 5.10% 4.80%
House price growth 1.60% 2.10%
Commercial real estate price growth 0.60% 0.30%
UK Bank Rate 3.25% 4.00%
CPI inflation 2.20% 2.70%