v3.25.2
Credit risk - Macroeconomic variables used in the calculation of ECL (Details)
Jun. 30, 2025
Dec. 31, 2024
Baseline    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 34.40% 32.50%
Baseline | GDP | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.70% 1.00%
Baseline | GDP | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.70%
Baseline | GDP | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.20% 1.40%
Baseline | GDP | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 2.00%
Baseline | GDP | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.50%
Baseline | GDP | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | GDP | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.60% 1.60%
Baseline | GDP | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | GDP | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.70% 1.50%
Baseline | GDP | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | Unemployment | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.30%
Baseline | Unemployment | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.10%
Baseline | Unemployment | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.40%
Baseline | Unemployment | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.30%
Baseline | Unemployment | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.50%
Baseline | Unemployment | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.20%
Baseline | Unemployment | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.40%
Baseline | Unemployment | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.20%
Baseline | Unemployment | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.40%
Baseline | Unemployment | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.20%
Baseline | HPI | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.80%
Baseline | HPI | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 6.50%
Baseline | HPI | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 3.30%
Baseline | HPI | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.60%
Baseline | HPI | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 1.60%
Baseline | HPI | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.70%
Baseline | HPI | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 4.50%
Baseline | HPI | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 3.00%
Baseline | HPI | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.00%
Baseline | HPI | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 3.00%
Baseline | Bank rate | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 5.10%
Baseline | Bank rate | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 4.30%
Baseline | Bank rate | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 4.00%
Baseline | Bank rate | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 4.00%
Baseline | Bank rate | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.80%
Baseline | Federal funds rate | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 5.10%
Baseline | Federal funds rate | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 4.10%
Baseline | Federal funds rate | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 4.00%
Baseline | Federal funds rate | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.80%
Baseline | Federal funds rate | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.80%
Downside 2    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.50% 8.60%
Downside 2 | GDP | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.20%) 1.00%
Downside 2 | GDP | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.90% 2.70%
Downside 2 | GDP | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (3.40%) (2.30%)
Downside 2 | GDP | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (4.70%) (1.30%)
Downside 2 | GDP | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.70% (1.30%)
Downside 2 | GDP | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.20%) (1.30%)
Downside 2 | GDP | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.60%
Downside 2 | GDP | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 3.30%
Downside 2 | GDP | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.80% 2.30%
Downside 2 | GDP | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.90%
Downside 2 | Unemployment | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.30%
Downside 2 | Unemployment | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.10%
Downside 2 | Unemployment | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.60% 6.20%
Downside 2 | Unemployment | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.30% 5.80%
Downside 2 | Unemployment | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.50% 8.10%
Downside 2 | Unemployment | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.80% 7.20%
Downside 2 | Unemployment | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.90% 6.60%
Downside 2 | Unemployment | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.40% 6.20%
Downside 2 | Unemployment | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.30% 5.50%
Downside 2 | Unemployment | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.80% 5.50%
Downside 2 | HPI | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (9.40%) 2.80%
Downside 2 | HPI | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.60%) 6.50%
Downside 2 | HPI | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (20.60%) (24.80%)
Downside 2 | HPI | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (6.60%) (8.00%)
Downside 2 | HPI | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.20% (5.20%)
Downside 2 | HPI | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% (0.70%)
Downside 2 | HPI | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 18.10% 10.00%
Downside 2 | HPI | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 9.10% 5.20%
Downside 2 | HPI | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 10.00% 14.60%
Downside 2 | HPI | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.00%
Downside 2 | Bank rate | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.00% 5.10%
Downside 2 | Bank rate | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 3.50%
Downside 2 | Bank rate | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.20% 1.70%
Downside 2 | Bank rate | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.80% 0.60%
Downside 2 | Bank rate | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.10%
Downside 2 | Federal funds rate | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 5.10%
Downside 2 | Federal funds rate | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 2.50%
Downside 2 | Federal funds rate | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 0.60%
Downside 2 | Federal funds rate | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 0.80%
Downside 2 | Federal funds rate | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.20% 1.50%
Downside 1    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 15.20% 14.70%
Downside 1 | GDP | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.20% 1.00%
Downside 1 | GDP | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 2.70%
Downside 1 | GDP | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.10%) (0.50%)
Downside 1 | GDP | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.60%) 0.30%
Downside 1 | GDP | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.60% 0.10%
Downside 1 | GDP | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.90% 0.40%
Downside 1 | GDP | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.10%
Downside 1 | GDP | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Downside 1 | GDP | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.80% 1.90%
Downside 1 | GDP | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.40%
Downside 1 | Unemployment | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.30%
Downside 1 | Unemployment | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.10%
Downside 1 | Unemployment | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.20% 5.30%
Downside 1 | Unemployment | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.90% 5.10%
Downside 1 | Unemployment | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.10% 6.30%
Downside 1 | Unemployment | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.20% 5.70%
Downside 1 | Unemployment | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.20% 5.50%
Downside 1 | Unemployment | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.50% 5.20%
Downside 1 | Unemployment | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 5.00%
Downside 1 | Unemployment | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.20% 4.90%
Downside 1 | HPI | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (3.70%) 2.80%
Downside 1 | HPI | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.50% 6.50%
Downside 1 | HPI | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (9.60%) (11.60%)
Downside 1 | HPI | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (2.40%) (2.70%)
Downside 1 | HPI | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.70% (1.80%)
Downside 1 | HPI | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 1.00%
Downside 1 | HPI | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 10.70% 7.20%
Downside 1 | HPI | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.50% 4.10%
Downside 1 | HPI | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.00% 8.70%
Downside 1 | HPI | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 3.50%
Downside 1 | Bank rate | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 5.10%
Downside 1 | Bank rate | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.90%
Downside 1 | Bank rate | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.20% 2.90%
Downside 1 | Bank rate | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.30%
Downside 1 | Bank rate | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 2.40%
Downside 1 | Federal funds rate | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 5.10%
Downside 1 | Federal funds rate | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.40%
Downside 1 | Federal funds rate | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 2.30%
Downside 1 | Federal funds rate | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.30%
Downside 1 | Federal funds rate | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.70%
Upside 2    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 15.50% 17.40%
Upside 2 | GDP | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.10% 1.00%
Upside 2 | GDP | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.70%
Upside 2 | GDP | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.00%
Upside 2 | GDP | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 2.80%
Upside 2 | GDP | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 3.70%
Upside 2 | GDP | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.10%
Upside 2 | GDP | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.90%
Upside 2 | GDP | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 2 | GDP | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.40%
Upside 2 | GDP | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 2 | Unemployment | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.30%
Upside 2 | Unemployment | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Upside 2 | Unemployment | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.00% 3.80%
Upside 2 | Unemployment | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.80%
Upside 2 | Unemployment | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.40%
Upside 2 | Unemployment | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 2 | Unemployment | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | Unemployment | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 2 | Unemployment | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | Unemployment | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 2 | HPI | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 2.80%
Upside 2 | HPI | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.20% 6.50%
Upside 2 | HPI | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 14.20% 11.90%
Upside 2 | HPI | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 6.20%
Upside 2 | HPI | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.80% 8.40%
Upside 2 | HPI | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.30% 4.70%
Upside 2 | HPI | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 5.10%
Upside 2 | HPI | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.80%
Upside 2 | HPI | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 4.10%
Upside 2 | HPI | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.90%
Upside 2 | Bank rate | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 5.10%
Upside 2 | Bank rate | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.90%
Upside 2 | Bank rate | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 2.90%
Upside 2 | Bank rate | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.80%
Upside 2 | Bank rate | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 2.80%
Upside 2 | Federal funds rate | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 5.10%
Upside 2 | Federal funds rate | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.70%
Upside 2 | Federal funds rate | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.30%
Upside 2 | Federal funds rate | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.10%
Upside 2 | Federal funds rate | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 1    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 26.40% 26.80%
Upside 1 | GDP | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.90% 1.00%
Upside 1 | GDP | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Upside 1 | GDP | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 2.20%
Upside 1 | GDP | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.40%
Upside 1 | GDP | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.60%
Upside 1 | GDP | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.60%
Upside 1 | GDP | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.20%
Upside 1 | GDP | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 1 | GDP | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Upside 1 | GDP | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 1 | Unemployment | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.30%
Upside 1 | Unemployment | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 4.10%
Upside 1 | Unemployment | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 4.10%
Upside 1 | Unemployment | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.00%
Upside 1 | Unemployment | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 4.00%
Upside 1 | Unemployment | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 3.90%
Upside 1 | Unemployment | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.00%
Upside 1 | Unemployment | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 3.90%
Upside 1 | Unemployment | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.00%
Upside 1 | Unemployment | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 3.90%
Upside 1 | HPI | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 2.80%
Upside 1 | HPI | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.00% 6.50%
Upside 1 | HPI | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.10% 7.60%
Upside 1 | HPI | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 4.40%
Upside 1 | HPI | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.90%
Upside 1 | HPI | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.70%
Upside 1 | HPI | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 4.80%
Upside 1 | HPI | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 3.90%
Upside 1 | HPI | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 1 | HPI | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 3.90%
Upside 1 | Bank rate | Not later than one year | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 5.10%
Upside 1 | Bank rate | Later than one year and not later than two years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 4.10%
Upside 1 | Bank rate | Later than two years and not later than three years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 3.50%
Upside 1 | Bank rate | Later than three years and not later than four years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 3.40%
Upside 1 | Bank rate | Later than four years and not later than five years | UK    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 3.30%
Upside 1 | Federal funds rate | Not later than one year | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 5.10%
Upside 1 | Federal funds rate | Later than one year and not later than two years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 4.00%
Upside 1 | Federal funds rate | Later than two years and not later than three years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 3.80%
Upside 1 | Federal funds rate | Later than three years and not later than four years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 3.60%
Upside 1 | Federal funds rate | Later than four years and not later than five years | US    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 3.30%