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Allowance for expected credit losses - Disclosure of Generation of Multiple Economic Assumptions by Quarter and by Year (Details)
Dec. 31, 2023
Dec. 31, 2022
Upside    
Five year average [Abstract]    
Gross domestic product (in percent) 1.40% 1.80%
Unemployment rate (in percent) 3.30% 3.20%
House price growth (in percent) 4.70% 4.50%
Commercial real estate price growth (in percent) 2.20% 1.30%
UK Bank Rate (in percent) 5.37% 4.22%
CPI inflation rate (in percent) 3.90% 5.50%
Base case    
Five year average [Abstract]    
Gross domestic product (in percent) 1.10% 1.40%
Unemployment rate (in percent) 4.90% 4.80%
House price growth (in percent) 1.00% 0.20%
Commercial real estate price growth (in percent) (0.90%) (1.80%)
UK Bank Rate (in percent) 4.08% 3.06%
CPI inflation rate (in percent) 3.50% 5.00%
Downside    
Five year average [Abstract]    
Gross domestic product (in percent) 0.50% 0.80%
Unemployment rate (in percent) 6.80% 6.50%
House price growth (in percent) (3.40%) (5.40%)
Commercial real estate price growth (in percent) (4.40%) (6.40%)
UK Bank Rate (in percent) 2.51% 1.65%
CPI inflation rate (in percent) 3.20% 4.40%
Severe downside    
Five year average [Abstract]    
Gross domestic product (in percent) 0.10% 0.10%
Unemployment rate (in percent) 8.80% 8.80%
House price growth (in percent) (8.20%) (9.80%)
Commercial real estate price growth (in percent) (10.30%) (11.60%)
UK Bank Rate – modelled 1.67% 0.76%
UK Bank Rate – adjusted 4.56% 4.18%
CPI inflation – modelled 2.60% 3.60%
CPI inflation – adjusted 4.20% 7.70%
Probability-weighted    
Five year average [Abstract]    
Gross domestic product (in percent) 0.90% 1.20%
Unemployment rate (in percent) 5.40% 5.20%
House price growth (in percent) (0.10%) (1.20%)
Commercial real estate price growth (in percent) (1.90%) (3.10%)
UK Bank Rate – modelled 3.75% 2.76%
UK Bank Rate – adjusted 4.04% 3.10%
CPI inflation – modelled 3.40% 4.90%
CPI inflation – adjusted 3.60% 5.30%
Upside | Start to peak    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 8.10% 6.50%
Unemployment rate (in percent) 4.20% 3.80%
House price growth (in percent) 25.70% 24.80%
Commercial real estate price growth (in percent) 11.50% 7.20%
UK Bank Rate (in percent) 5.79% 5.39%
CPI inflation rate (in percent) 10.20% 10.70%
Upside | Start to trough    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.20% 0.40%
Unemployment rate (in percent) 3.00% 2.80%
House price growth (in percent) (1.20%) (1.10%)
Commercial real estate price growth (in percent) (3.90%) (9.40%)
UK Bank Rate (in percent) 4.25% 0.75%
CPI inflation rate (in percent) 2.10% 2.90%
Upside | Current reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% 4.10%
Unemployment rate (in percent) 4.00% 3.50%
House price growth (in percent) 1.90% 2.40%
Commercial real estate price growth (in percent) (3.90%) (9.40%)
UK Bank Rate (in percent) 4.94% 1.94%
CPI inflation rate (in percent) 7.30% 9.00%
Upside | One year after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.50% 0.10%
Unemployment rate (in percent) 3.30% 2.80%
House price growth (in percent) 0.80% (2.80%)
Commercial real estate price growth (in percent) 9.00% 8.50%
UK Bank Rate (in percent) 5.72% 4.95%
CPI inflation rate (in percent) 2.70% 8.30%
Upside | Two years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.70% 1.10%
Unemployment rate (in percent) 3.10% 3.00%
House price growth (in percent) 6.90% 6.50%
Commercial real estate price growth (in percent) 3.80% 3.50%
UK Bank Rate (in percent) 5.61% 4.98%
CPI inflation rate (in percent) 3.10% 4.20%
Upside | Three years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.70% 1.70%
Unemployment rate (in percent) 3.10% 3.30%
House price growth (in percent) 7.20% 9.00%
Commercial real estate price growth (in percent) 1.30% 2.60%
UK Bank Rate (in percent) 5.38% 4.63%
CPI inflation rate (in percent) 3.20% 3.30%
Upside | Four years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.90% 2.10%
Unemployment rate (in percent) 3.10% 3.40%
House price growth (in percent) 6.80% 8.00%
Commercial real estate price growth (in percent) 1.30% 2.30%
UK Bank Rate (in percent) 5.18% 4.58%
CPI inflation rate (in percent) 3.10% 3.00%
Base case | Start to peak    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 6.40% 4.30%
Unemployment rate (in percent) 5.20% 5.30%
House price growth (in percent) 4.80% 6.40%
Commercial real estate price growth (in percent) (1.20%) 7.20%
UK Bank Rate (in percent) 5.25% 4.00%
CPI inflation rate (in percent) 10.20% 10.70%
Base case | Start to trough    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.20% (1.10%)
Unemployment rate (in percent) 3.90% 3.60%
House price growth (in percent) (1.20%) (6.30%)
Commercial real estate price growth (in percent) (5.30%) (14.80%)
UK Bank Rate (in percent) 3.00% 0.75%
CPI inflation rate (in percent) 2.10% 1.60%
Base case | Current reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% 4.00%
Unemployment rate (in percent) 4.20% 3.70%
House price growth (in percent) 1.40% 2.00%
Commercial real estate price growth (in percent) (5.10%) (11.80%)
UK Bank Rate (in percent) 4.94% 1.94%
CPI inflation rate (in percent) 7.30% 9.00%
Base case | Current year quarter one    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% 0.60%
Unemployment rate (in percent) 3.90% 3.70%
House price growth (in percent) 1.60% 11.10%
Commercial real estate price growth (in percent) (18.80%) 18.00%
UK Bank Rate (in percent) 4.25% 0.75%
CPI inflation rate (in percent) 10.20% 6.20%
Base case | Current year quarter two    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.00% 0.10%
Unemployment rate (in percent) 4.20% 3.80%
House price growth (in percent) (2.60%) 12.50%
Commercial real estate price growth (in percent) (21.20%) 18.00%
UK Bank Rate (in percent) 5.00% 1.25%
CPI inflation rate (in percent) 8.40% 9.20%
Base case | Current year quarter three    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (0.10%) (0.30%)
Unemployment rate (in percent) 4.20% 3.60%
House price growth (in percent) (4.50%) 9.80%
Commercial real estate price growth (in percent) (18.20%) 8.40%
UK Bank Rate (in percent) 5.25% 2.25%
CPI inflation rate (in percent) 6.70% 10.00%
Base case | Current year quarter four    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.00% (0.40%)
Unemployment rate (in percent) 4.30% 3.70%
House price growth (in percent) 1.40% 2.00%
Commercial real estate price growth (in percent) (5.10%) (11.80%)
UK Bank Rate (in percent) 5.25% 3.50%
CPI inflation rate (in percent) 4.00% 10.70%
Base case | One year after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.50% (1.20%)
Unemployment rate (in percent) 4.90% 4.50%
House price growth (in percent) (2.20%) (6.90%)
Commercial real estate price growth (in percent) (0.20%) (3.30%)
UK Bank Rate (in percent) 4.88% 4.00%
CPI inflation rate (in percent) 2.70% 8.30%
Base case | One year after reporting year, quarter one    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.10% (0.40%)
Unemployment rate (in percent) 4.50% 4.00%
House price growth (in percent) (1.10%) (3.00%)
Commercial real estate price growth (in percent) (4.10%) (16.90%)
UK Bank Rate (in percent) 5.25% 4.00%
CPI inflation rate (in percent) 3.80% 10.00%
Base case | One year after reporting year, quarter two    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.20% (0.40%)
Unemployment rate (in percent) 4.80% 4.40%
House price growth (in percent) (1.50%) (8.40%)
Commercial real estate price growth (in percent) (3.80%) (19.80%)
UK Bank Rate (in percent) 5.00% 4.00%
CPI inflation rate (in percent) 2.10% 8.90%
Base case | One year after reporting year, quarter three    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% (0.20%)
Unemployment rate (in percent) 5.00% 4.70%
House price growth (in percent) 0.50% (9.80%)
Commercial real estate price growth (in percent) (2.20%) (15.90%)
UK Bank Rate (in percent) 4.75% 4.00%
CPI inflation rate (in percent) 2.30% 8.00%
Base case | One year after reporting year, quarter four    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% (0.10%)
Unemployment rate (in percent) 5.20% 4.90%
House price growth (in percent) (2.20%) (6.90%)
Commercial real estate price growth (in percent) (0.20%) (3.30%)
UK Bank Rate (in percent) 4.50% 4.00%
CPI inflation rate (in percent) 2.80% 6.10%
Base case | Two years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.20% 0.50%
Unemployment rate (in percent) 5.20% 5.10%
House price growth (in percent) 0.50% (1.20%)
Commercial real estate price growth (in percent) 0.10% 0.90%
UK Bank Rate (in percent) 4.00% 3.38%
CPI inflation rate (in percent) 2.90% 3.70%
Base case | Three years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.70% 1.60%
Unemployment rate (in percent) 5.20% 5.30%
House price growth (in percent) 1.60% 2.90%
Commercial real estate price growth (in percent) 0.00% 2.80%
UK Bank Rate (in percent) 3.50% 3.00%
CPI inflation rate (in percent) 2.50% 2.30%
Base case | Four years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.90% 2.10%
Unemployment rate (in percent) 5.00% 5.10%
House price growth (in percent) 3.50% 4.40%
Commercial real estate price growth (in percent) 0.80% 3.10%
UK Bank Rate (in percent) 3.06% 3.00%
CPI inflation rate (in percent) 2.20% 1.70%
Downside | Start to peak    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 3.40% 1.20%
Unemployment rate (in percent) 8.00% 7.70%
House price growth (in percent) 2.00% 6.40%
Commercial real estate price growth (in percent) (1.20%) 7.20%
UK Bank Rate (in percent) 5.25% 3.62%
CPI inflation rate (in percent) 10.20% 10.70%
Downside | Start to trough    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (1.20%) (3.60%)
Unemployment rate (in percent) 3.90% 3.60%
House price growth (in percent) (15.70%) (24.30%)
Commercial real estate price growth (in percent) (20.40%) (29.60%)
UK Bank Rate (in percent) 0.43% 0.75%
CPI inflation rate (in percent) 1.00% 0.20%
Downside | Current reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.20% 3.90%
Unemployment rate (in percent) 4.30% 3.80%
House price growth (in percent) 1.30% 1.60%
Commercial real estate price growth (in percent) (6.00%) (13.90%)
UK Bank Rate (in percent) 4.94% 1.94%
CPI inflation rate (in percent) 7.30% 9.00%
Downside | One year after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (1.00%) (3.00%)
Unemployment rate (in percent) 6.50% 6.30%
House price growth (in percent) (4.50%) (11.10%)
Commercial real estate price growth (in percent) (8.70%) (15.00%)
UK Bank Rate (in percent) 3.95% 2.93%
CPI inflation rate (in percent) 2.80% 8.20%
Downside | Two years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (0.10%) (0.50%)
Unemployment rate (in percent) 7.80% 7.50%
House price growth (in percent) (6.00%) (9.80%)
Commercial real estate price growth (in percent) (4.00%) (3.70%)
UK Bank Rate (in percent) 1.96% 1.39%
CPI inflation rate (in percent) 2.70% 3.30%
Downside | Three years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.50% 1.40%
Unemployment rate (in percent) 7.90% 7.60%
House price growth (in percent) (5.60%) (5.60%)
Commercial real estate price growth (in percent) (2.10%) 0.40%
UK Bank Rate (in percent) 1.13% 0.98%
CPI inflation rate (in percent) 1.80% 1.30%
Downside | Four years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 2.00% 2.10%
Unemployment rate (in percent) 7.60% 7.20%
House price growth (in percent) (1.70%) (1.50%)
Commercial real estate price growth (in percent) (1.20%) 1.40%
UK Bank Rate (in percent) 0.55% 1.04%
CPI inflation rate (in percent) 1.10% 0.30%
Severe downside | Start to peak    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.00% 0.70%
Unemployment rate (in percent) 10.50% 10.70%
House price growth (in percent) 2.00% 6.40%
Commercial real estate price growth (in percent) (1.20%) 7.20%
UK Bank Rate – modelled 5.25% 3.50%
UK Bank Rate – adjusted 6.75% 7.00%
CPI inflation – modelled 10.20% 10.70%
CPI inflation – adjusted 10.20% 14.80%
Severe downside | Start to trough    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (2.90%) (6.40%)
Unemployment rate (in percent) 3.90% 3.60%
House price growth (in percent) (35.00%) (40.10%)
Commercial real estate price growth (in percent) (41.80%) (47.80%)
UK Bank Rate – modelled 0.02% 0.12%
UK Bank Rate – adjusted 3.00% 0.75%
CPI inflation – modelled (0.30%) (1.70%)
CPI inflation – adjusted 0.90% 1.50%
Severe downside | Current reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.10% 3.70%
Unemployment rate (in percent) 4.50% 4.10%
House price growth (in percent) 0.60% 1.10%
Commercial real estate price growth (in percent) (7.70%) (17.30%)
UK Bank Rate – modelled 4.94% 1.94%
UK Bank Rate – adjusted 4.94% 2.44%
CPI inflation – modelled 7.30% 9.00%
CPI inflation – adjusted 7.60% 9.70%
Severe downside | One year after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (2.30%) (5.20%)
Unemployment rate (in percent) 8.70% 9.00%
House price growth (in percent) (7.60%) (14.80%)
Commercial real estate price growth (in percent) (19.50%) (28.80%)
UK Bank Rate – modelled 2.75% 1.41%
UK Bank Rate – adjusted 6.56% 7.00%
CPI inflation – modelled 2.70% 8.20%
CPI inflation – adjusted 7.50% 14.30%
Severe downside | Two years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) (0.50%) (1.00%)
Unemployment rate (in percent) 10.40% 10.70%
House price growth (in percent) (13.30%) (18.00%)
Commercial real estate price growth (in percent) (10.60%) (9.90%)
UK Bank Rate – modelled 0.49% 0.20%
UK Bank Rate – adjusted 4.56% 4.88%
CPI inflation – modelled 2.20% 2.60%
CPI inflation – adjusted 3.50% 9.00%
Severe downside | Three years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.30% 1.30%
Unemployment rate (in percent) 10.50% 10.40%
House price growth (in percent) (12.70%) (11.50%)
Commercial real estate price growth (in percent) (7.70%) (1.30%)
UK Bank Rate – modelled 0.13% 0.13%
UK Bank Rate – adjusted 3.63% 3.31%
CPI inflation – modelled 0.90% (0.10%)
CPI inflation – adjusted 1.30% 4.10%
Severe downside | Four years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.80% 2.10%
Unemployment rate (in percent) 10.10% 9.70%
House price growth (in percent) (7.50%) (4.20%)
Commercial real estate price growth (in percent) (5.20%) 3.20%
UK Bank Rate – modelled 0.03% 0.14%
UK Bank Rate – adjusted 3.13% 3.25%
CPI inflation – modelled (0.20%) (1.60%)
CPI inflation – adjusted 1.00% 1.60%
Probability-weighted | Start to peak    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 5.40% 3.40%
Unemployment rate (in percent) 6.00% 5.90%
House price growth (in percent) 2.00% 6.40%
Commercial real estate price growth (in percent) (1.20%) 7.20%
UK Bank Rate – modelled 5.25% 3.89%
UK Bank Rate – adjusted 5.42% 4.31%
CPI inflation – modelled 10.20% 10.70%
CPI inflation – adjusted 10.20% 11.00%
Probability-weighted | Start to trough    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.10% (1.80%)
Unemployment rate (in percent) 3.90% 3.60%
House price growth (in percent) (2.80%) (9.50%)
Commercial real estate price growth (in percent) (9.90%) (18.60%)
UK Bank Rate – modelled 2.59% 0.75%
UK Bank Rate – adjusted 2.89% 0.75%
CPI inflation – modelled 1.90% 1.30%
CPI inflation – adjusted 2.00% 1.60%
Probability-weighted | Current reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.30% 4.00%
Unemployment rate (in percent) 4.20% 3.70%
House price growth (in percent) 1.40% 1.90%
Commercial real estate price growth (in percent) (5.30%) (12.30%)
UK Bank Rate – modelled 4.94% 1.94%
UK Bank Rate – adjusted 4.94% 1.99%
CPI inflation – modelled 7.30% 9.00%
CPI inflation – adjusted 7.40% 9.10%
Probability-weighted | One year after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.10% (1.80%)
Unemployment rate (in percent) 5.30% 5.00%
House price growth (in percent) (2.50%) (7.70%)
Commercial real estate price growth (in percent) (1.90%) (5.80%)
UK Bank Rate – modelled 4.64% 3.70%
UK Bank Rate – adjusted 5.02% 4.26%
CPI inflation – modelled 2.70% 8.30%
CPI inflation – adjusted 3.20% 8.90%
Probability-weighted | Two years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 0.80% 0.20%
Unemployment rate (in percent) 5.90% 5.80%
House price growth (in percent) (0.90%) (3.20%)
Commercial real estate price growth (in percent) (1.10%) (0.80%)
UK Bank Rate – modelled 3.52% 2.94%
UK Bank Rate – adjusted 3.93% 3.41%
CPI inflation – modelled 2.80% 3.60%
CPI inflation – adjusted 3.00% 4.30%
Probability-weighted | Three years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.60% 1.50%
Unemployment rate (in percent) 5.90% 5.90%
House price growth (in percent) (0.30%) 0.70%
Commercial real estate price growth (in percent) (1.00%) 1.60%
UK Bank Rate – modelled 3.02% 2.59%
UK Bank Rate – adjusted 3.37% 2.91%
CPI inflation – modelled 2.30% 2.10%
CPI inflation – adjusted 2.40% 2.50%
Probability-weighted | Four years after reporting year    
Schedule of Key Economic Assumptions [Line Items]    
Gross domestic product (in percent) 1.90% 2.10%
Unemployment rate (in percent) 5.70% 5.70%
House price growth (in percent) 1.80% 2.90%
Commercial real estate price growth (in percent) (0.20%) 2.30%
UK Bank Rate – modelled 2.64% 2.60%
UK Bank Rate – adjusted 2.95% 2.91%
CPI inflation – modelled 1.90% 1.40%
CPI inflation – adjusted 2.00% 1.70%