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Critical accounting judgements and key sources of estimation uncertainty - Disclosure of Generation of Multiple Economic Assumptions by Quarter and by Year (Details)
Jun. 30, 2022
Dec. 31, 2021
Upside    
Five year average [Abstract]    
Gross domestic product 2.00% 3.00%
Unemployment rate 3.10% 3.70%
House price growth 5.20% 5.10%
Commercial real estate price growth 2.10% 3.70%
UK Bank Rate 2.68% 1.43%
CPI inflation 4.10% 3.50%
Base case    
Five year average [Abstract]    
Gross domestic product 1.70% 2.90%
Unemployment rate 4.30% 4.40%
House price growth 1.20% 2.10%
Commercial real estate price growth (1.10%) 1.20%
UK Bank Rate 1.94% 0.85%
CPI inflation 3.80% 3.00%
Downside    
Five year average [Abstract]    
Gross domestic product 1.40% 2.80%
Unemployment rate 5.80% 5.60%
House price growth (4.20%) (3.10%)
Commercial real estate price growth (5.30%) (2.60%)
UK Bank Rate 1.02% 0.47%
CPI inflation 3.50% 2.80%
Severe downside    
Five year average [Abstract]    
Gross domestic product 0.80% 2.10%
Unemployment rate 7.80% 7.30%
House price growth (9.10%) (6.90%)
Commercial real estate price growth (10.60%) (6.80%)
UK Bank Rate   0.08%
CPI inflation   2.40%
UK Bank Rate – modelled 0.31%  
UK Bank Rate – adjusted 3.04%  
CPI inflation – modelled 2.70%  
CPI inflation – adjusted 5.90%  
Probability-weighted    
Five year average [Abstract]    
Gross domestic product 1.60% 2.80%
Unemployment rate 4.70% 4.80%
House price growth (0.20%) 0.60%
Commercial real estate price growth (2.30%) 0.10%
UK Bank Rate   0.83%
CPI inflation   3.10%
UK Bank Rate – modelled 1.72%  
UK Bank Rate – adjusted 1.99%  
CPI inflation – modelled 3.70%  
CPI inflation – adjusted 4.00%  
Upside | 2021    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   7.10%
Unemployment rate   4.40%
House price growth   10.10%
Commercial real estate price growth   12.40%
UK Bank Rate   0.14%
CPI inflation   2.60%
Upside | 2022    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 3.50% 4.00%
Unemployment rate 3.10% 3.30%
House price growth 3.20% 2.60%
Commercial real estate price growth 9.20% 5.80%
UK Bank Rate 1.64% 1.44%
CPI inflation 8.60% 5.90%
Upside | 2023    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.20% 1.40%
Unemployment rate 2.70% 3.40%
House price growth 3.60% 4.90%
Commercial real estate price growth 1.80% 0.70%
UK Bank Rate 3.12% 1.74%
CPI inflation 5.50% 3.30%
Upside | 2024    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.80% 1.30%
Unemployment rate 2.90% 3.50%
House price growth 9.30% 4.70%
Commercial real estate price growth 0.90% 1.00%
UK Bank Rate 2.97% 1.82%
CPI inflation 2.50% 2.60%
Upside | 2025    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.70% 1.40%
Unemployment rate 3.20% 3.70%
House price growth 5.90% 3.60%
Commercial real estate price growth (0.90%) (0.60%)
UK Bank Rate 2.88% 2.03%
CPI inflation 1.90% 3.30%
Upside | 2026    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.70%  
Unemployment rate 3.40%  
House price growth 4.30%  
Commercial real estate price growth (0.20%)  
UK Bank Rate 2.78%  
CPI inflation 2.20%  
Base case | 2021    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   7.10%
Unemployment rate   4.50%
House price growth   9.80%
Commercial real estate price growth   10.20%
UK Bank Rate   0.14%
CPI inflation   2.60%
Base case | 2021 Q1    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   (1.30%)
Unemployment rate   4.90%
House price growth   6.50%
Commercial real estate price growth   (2.90%)
UK Bank Rate   0.10%
CPI inflation   0.60%
Base case | 2021 Q2    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   5.40%
Unemployment rate   4.70%
House price growth   8.70%
Commercial real estate price growth   3.40%
UK Bank Rate   0.10%
CPI inflation   2.10%
Base case | 2021 Q3    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   1.10%
Unemployment rate   4.30%
House price growth   7.40%
Commercial real estate price growth   7.50%
UK Bank Rate   0.10%
CPI inflation   2.80%
Base case | 2021 Q4    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   0.40%
Unemployment rate   4.30%
House price growth   9.80%
Commercial real estate price growth   10.20%
UK Bank Rate   0.25%
CPI inflation   4.90%
Base case | 2022    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 3.30% 3.70%
Unemployment rate 3.80% 4.30%
House price growth 1.80% 0.00%
Commercial real estate price growth 1.80% (2.20%)
UK Bank Rate 1.44% 0.81%
CPI inflation 8.60% 5.90%
Base case | 2022 Q1    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.80% 0.10%
Unemployment rate 3.70% 4.40%
House price growth 11.10% 8.40%
Commercial real estate price growth 18.00% 8.40%
UK Bank Rate 0.75% 0.50%
CPI inflation 6.20% 5.30%
Base case | 2022 Q2    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product (0.40%) 1.50%
Unemployment rate 3.80% 4.30%
House price growth 10.50% 6.10%
Commercial real estate price growth 15.30% 5.20%
UK Bank Rate 1.25% 0.75%
CPI inflation 9.10% 6.50%
Base case | 2022 Q3    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.10% 0.50%
Unemployment rate 3.80% 4.30%
House price growth 6.80% 3.20%
Commercial real estate price growth 9.50% 0.90%
UK Bank Rate 1.75% 1.00%
CPI inflation 9.30% 6.30%
Base case | 2022 Q4    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.20% 0.30%
Unemployment rate 3.90% 4.30%
House price growth 1.80% 0.00%
Commercial real estate price growth 1.80% (2.20%)
UK Bank Rate 2.00% 1.00%
CPI inflation 10.00% 5.30%
Base case | 2023    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.60% 1.50%
Unemployment rate 4.20% 4.40%
House price growth (1.40%) 0.00%
Commercial real estate price growth (5.00%) (1.90%)
UK Bank Rate 2.25% 1.00%
CPI inflation 5.50% 3.00%
Base case | 2023 Q1    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.20%  
Unemployment rate 4.00%  
House price growth (2.20%)  
Commercial real estate price growth (4.30%)  
UK Bank Rate 2.25%  
CPI inflation 9.00%  
Base case | 2023 Q2    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.20%  
Unemployment rate 4.20%  
House price growth (4.10%)  
Commercial real estate price growth (6.30%)  
UK Bank Rate 2.25%  
CPI inflation 5.40%  
Base case | 2023 Q3    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.40%  
Unemployment rate 4.30%  
House price growth (3.70%)  
Commercial real estate price growth (5.30%)  
UK Bank Rate 2.25%  
CPI inflation 5.00%  
Base case | 2023 Q4    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.40%  
Unemployment rate 4.30%  
House price growth (1.40%)  
Commercial real estate price growth (5.00%)  
UK Bank Rate 2.25%  
CPI inflation 2.80%  
Base case | 2024    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.50% 1.30%
Unemployment rate 4.40% 4.40%
House price growth 3.40% 0.50%
Commercial real estate price growth (1.60%) 0.10%
UK Bank Rate 2.00% 1.06%
CPI inflation 2.20% 1.60%
Base case | 2025    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.60% 1.30%
Unemployment rate 4.50% 4.50%
House price growth 1.20% 0.70%
Commercial real estate price growth (1.30%) 0.60%
UK Bank Rate 2.00% 1.25%
CPI inflation 1.30% 2.00%
Base case | 2026    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.70%  
Unemployment rate 4.50%  
House price growth 1.00%  
Commercial real estate price growth 0.80%  
UK Bank Rate 2.00%  
CPI inflation 1.50%  
Downside | 2021    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   7.10%
Unemployment rate   4.70%
House price growth   9.20%
Commercial real estate price growth   8.60%
UK Bank Rate   0.14%
CPI inflation   2.60%
Downside | 2022    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 3.00% 3.40%
Unemployment rate 4.50% 5.60%
House price growth (0.10%) (4.90%)
Commercial real estate price growth (4.40%) (10.10%)
UK Bank Rate 1.25% 0.45%
CPI inflation 8.70% 5.80%
Downside | 2023    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product (0.10%) 1.30%
Unemployment rate 6.00% 5.90%
House price growth (7.60%) (7.80%)
Commercial real estate price growth (11.90%) (7.00%)
UK Bank Rate 1.23% 0.52%
CPI inflation 5.50% 2.80%
Downside | 2024    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.10% 1.10%
Unemployment rate 6.30% 5.80%
House price growth (4.60%) (6.60%)
Commercial real estate price growth (5.50%) (3.40%)
UK Bank Rate 0.80% 0.55%
CPI inflation 1.80% 1.30%
Downside | 2025    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.40% 1.20%
Unemployment rate 6.10% 5.70%
House price growth (5.10%) (4.70%)
Commercial real estate price growth (3.60%) (0.30%)
UK Bank Rate 0.85% 0.69%
CPI inflation 0.60% 1.60%
Downside | 2026    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.70%  
Unemployment rate 5.90%  
House price growth (3.50%)  
Commercial real estate price growth (0.70%)  
UK Bank Rate 0.95%  
CPI inflation 0.70%  
Severe downside | 2021    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   6.80%
Unemployment rate   4.90%
House price growth   9.10%
Commercial real estate price growth   5.80%
UK Bank Rate   0.14%
CPI inflation   2.60%
Severe downside | 2022    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.60% 0.90%
Unemployment rate 5.80% 7.70%
House price growth (1.60%) (7.30%)
Commercial real estate price growth (14.90%) (19.60%)
UK Bank Rate   0.04%
CPI inflation   5.80%
UK Bank Rate – modelled 0.76%  
UK Bank Rate – adjusted 2.94%  
CPI inflation – modelled 8.60%  
CPI inflation – adjusted 9.80%  
Severe downside | 2023    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product (1.80%) 0.40%
Unemployment rate 8.70% 8.50%
House price growth (14.00%) (13.90%)
Commercial real estate price growth (20.90%) (12.10%)
UK Bank Rate   0.06%
CPI inflation   2.30%
UK Bank Rate – modelled 0.18%  
UK Bank Rate – adjusted 4.75%  
CPI inflation – modelled 5.10%  
CPI inflation – adjusted 13.70%  
Severe downside | 2024    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.00% 1.00%
Unemployment rate 8.70% 8.10%
House price growth (12.30%) (12.50%)
Commercial real estate price growth (11.00%) (5.30%)
UK Bank Rate   0.08%
CPI inflation   0.50%
UK Bank Rate – modelled 0.18%  
UK Bank Rate – adjusted 3.00%  
CPI inflation – modelled 0.90%  
CPI inflation – adjusted 4.10%  
Severe downside | 2025    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.40% 1.40%
Unemployment rate 8.30% 7.60%
House price growth (10.50%) (8.40%)
Commercial real estate price growth (5.60%) (0.50%)
UK Bank Rate   0.09%
CPI inflation   0.90%
UK Bank Rate – modelled 0.21%  
UK Bank Rate – adjusted 2.25%  
CPI inflation – modelled (0.50%)  
CPI inflation – adjusted 1.70%  
Severe downside | 2026    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.60%  
Unemployment rate 7.70%  
House price growth (6.40%)  
Commercial real estate price growth 1.00%  
UK Bank Rate – modelled 0.24%  
UK Bank Rate – adjusted 2.25%  
CPI inflation – modelled (0.50%)  
CPI inflation – adjusted 0.10%  
Probability-weighted | 2021    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product   7.00%
Unemployment rate   4.60%
House price growth   9.60%
Commercial real estate price growth   9.90%
UK Bank Rate   0.14%
CPI inflation   2.60%
Probability-weighted | 2022    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 3.10% 3.40%
Unemployment rate 4.00% 4.70%
House price growth 1.30% (1.40%)
Commercial real estate price growth 0.50% (3.90%)
UK Bank Rate   0.82%
CPI inflation   5.90%
UK Bank Rate – modelled 1.37%  
UK Bank Rate – adjusted 1.59%  
CPI inflation – modelled 8.60%  
CPI inflation – adjusted 8.80%  
Probability-weighted | 2023    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 0.30% 1.30%
Unemployment rate 4.70% 5.00%
House price growth (3.00%) (2.30%)
Commercial real estate price growth (6.60%) (3.70%)
UK Bank Rate   0.99%
CPI inflation   2.90%
UK Bank Rate – modelled 2.00%  
UK Bank Rate – adjusted 2.46%  
CPI inflation – modelled 5.50%  
CPI inflation – adjusted 6.30%  
Probability-weighted | 2024    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.50% 1.20%
Unemployment rate 5.00% 5.00%
House price growth 1.20% (1.70%)
Commercial real estate price growth (3.00%) (1.20%)
UK Bank Rate   1.04%
CPI inflation   1.70%
UK Bank Rate – modelled 1.75%  
UK Bank Rate – adjusted 2.03%  
CPI inflation – modelled 2.00%  
CPI inflation – adjusted 2.30%  
Probability-weighted | 2025    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.50% 1.30%
Unemployment rate 5.00% 4.90%
House price growth (0.50%) (1.00%)
Commercial real estate price growth (2.30%) (0.10%)
UK Bank Rate   1.20%
CPI inflation   2.20%
UK Bank Rate – modelled 1.74%  
UK Bank Rate – adjusted 1.94%  
CPI inflation – modelled 1.10%  
CPI inflation – adjusted 1.30%  
Probability-weighted | 2026    
Schedule Of Key Economic Assumptions [Line Items]    
Gross domestic product 1.70%  
Unemployment rate 4.90%  
House price growth (0.10%)  
Commercial real estate price growth 0.10%  
UK Bank Rate – modelled 1.75%  
UK Bank Rate – adjusted 1.95%  
CPI inflation – modelled 1.30%  
CPI inflation – adjusted 1.30%