v3.25.4
Risk Management - Disclosure of macroeconomic variables used in the calculation of ECL and Scenario probability weighting (Details)
Dec. 31, 2025
Dec. 31, 2024
Baseline    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 38.50% 32.50%
Baseline | UK | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 1.40%
Baseline | UK | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 1.40%
Baseline | UK | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.00%
Baseline | UK | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.10% 1.40%
Baseline | UK | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 1.50%
Baseline | UK | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 1.60%
Baseline | UK | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 1.50%
Baseline | UK | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.40%
Baseline | UK | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.40%
Baseline | UK | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.30%
Baseline | UK | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.40%
Baseline | UK | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.50%
Baseline | UK | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.40%
Baseline | UK | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.40%
Baseline | UK | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.00% 3.00%
Baseline | UK | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.00% 3.00%
Baseline | UK | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 2.80%
Baseline | UK | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.30%
Baseline | UK | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 1.60%
Baseline | UK | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 4.50%
Baseline | UK | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.00%
Baseline | UK | Bank rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 4.20%
Baseline | UK | Bank rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 4.20%
Baseline | UK | Bank rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Baseline | UK | Bank rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 4.30%
Baseline | UK | Bank rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 4.00%
Baseline | UK | Bank rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 4.00%
Baseline | UK | Bank rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 3.80%
Baseline | United States | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.20%
Baseline | United States | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.20%
Baseline | United States | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Baseline | United States | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | United States | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | United States | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | United States | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Baseline | United States | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.20%
Baseline | United States | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.20%
Baseline | United States | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Baseline | United States | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.30%
Baseline | United States | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.20%
Baseline | United States | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.20%
Baseline | United States | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.20%
Baseline | United States | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 3.50%
Baseline | United States | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 3.50%
Baseline | United States | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 6.50%
Baseline | United States | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.70% 2.60%
Baseline | United States | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.70%
Baseline | United States | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 3.00%
Baseline | United States | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 3.00%
Baseline | United States | Federal funds rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 4.20%
Baseline | United States | Federal funds rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 4.20%
Baseline | United States | Federal funds rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Baseline | United States | Federal funds rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.40% 4.10%
Baseline | United States | Federal funds rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 4.00%
Baseline | United States | Federal funds rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 3.80%
Baseline | United States | Federal funds rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.50% 3.80%
Downside 2    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.00% 8.60%
Downside 2 | UK | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (3.50%) (2.90%)
Downside 2 | UK | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.30% 0.50%
Downside 2 | UK | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.00%
Downside 2 | UK | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (2.50%) (2.30%)
Downside 2 | UK | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.20%) (1.30%)
Downside 2 | UK | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.60%
Downside 2 | UK | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.10% 2.30%
Downside 2 | UK | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.10% 8.40%
Downside 2 | UK | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.20% 6.10%
Downside 2 | UK | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.30%
Downside 2 | UK | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.80% 6.20%
Downside 2 | UK | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.70% 8.10%
Downside 2 | UK | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.90% 6.60%
Downside 2 | UK | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.70% 5.50%
Downside 2 | UK | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (28.00%) (26.80%)
Downside 2 | UK | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (2.00%) (1.60%)
Downside 2 | UK | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 2.80%
Downside 2 | UK | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (24.90%) (24.80%)
Downside 2 | UK | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (5.10%) (5.20%)
Downside 2 | UK | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 9.60% 10.00%
Downside 2 | UK | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 14.20% 14.60%
Downside 2 | UK | Bank rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 5.30%
Downside 2 | UK | Bank rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.70% 2.40%
Downside 2 | UK | Bank rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Downside 2 | UK | Bank rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 3.50%
Downside 2 | UK | Bank rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.50% 1.70%
Downside 2 | UK | Bank rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.40% 0.60%
Downside 2 | UK | Bank rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.10% 1.10%
Downside 2 | United States | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (4.60%) (2.10%)
Downside 2 | United States | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.10% 1.20%
Downside 2 | United States | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Downside 2 | United States | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (2.70%) (1.30%)
Downside 2 | United States | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (2.80%) (1.30%)
Downside 2 | United States | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.60% 3.30%
Downside 2 | United States | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.90%
Downside 2 | United States | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.80% 7.50%
Downside 2 | United States | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.30% 5.80%
Downside 2 | United States | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Downside 2 | United States | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.70% 5.80%
Downside 2 | United States | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.00% 7.20%
Downside 2 | United States | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.90% 6.20%
Downside 2 | United States | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.90% 5.50%
Downside 2 | United States | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (8.10%) (4.00%)
Downside 2 | United States | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.20%
Downside 2 | United States | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 6.50%
Downside 2 | United States | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (8.20%) (8.00%)
Downside 2 | United States | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.70%) (0.70%)
Downside 2 | United States | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.20% 5.20%
Downside 2 | United States | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.70% 4.00%
Downside 2 | United States | Federal funds rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 5.30%
Downside 2 | United States | Federal funds rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 2.10%
Downside 2 | United States | Federal funds rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Downside 2 | United States | Federal funds rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 2.50%
Downside 2 | United States | Federal funds rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 0.60%
Downside 2 | United States | Federal funds rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.40% 0.80%
Downside 2 | United States | Federal funds rate | Four to five years    
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 12.70% 14.70%
Downside 1 | UK | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.30%) 0.20%
Downside 1 | UK | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.90% 0.90%
Downside 1 | UK | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.00%
Downside 1 | UK | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.70%) (0.50%)
Downside 1 | UK | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.10% 0.10%
Downside 1 | UK | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.10%
Downside 1 | UK | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.30% 1.90%
Downside 1 | UK | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.50% 6.50%
Downside 1 | UK | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.50% 5.30%
Downside 1 | UK | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.30%
Downside 1 | UK | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.30% 5.30%
Downside 1 | UK | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.30% 6.30%
Downside 1 | UK | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.80% 5.50%
Downside 1 | UK | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.20% 5.00%
Downside 1 | UK | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (12.60%) (11.30%)
Downside 1 | UK | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.60% 0.80%
Downside 1 | UK | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 2.80%
Downside 1 | UK | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (11.80%) (11.60%)
Downside 1 | UK | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.30%) (1.80%)
Downside 1 | UK | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.90% 7.20%
Downside 1 | UK | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.90% 8.70%
Downside 1 | UK | Bank rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 5.30%
Downside 1 | UK | Bank rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 3.30%
Downside 1 | UK | Bank rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Downside 1 | UK | Bank rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.90%
Downside 1 | UK | Bank rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.90%
Downside 1 | UK | Bank rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.30%
Downside 1 | UK | Bank rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Downside 1 | United States | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.20%) 0.40%
Downside 1 | United States | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.10% 1.70%
Downside 1 | United States | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Downside 1 | United States | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.30%) 0.30%
Downside 1 | United States | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (0.40%) 0.40%
Downside 1 | United States | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.80% 2.70%
Downside 1 | United States | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.20% 2.40%
Downside 1 | United States | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.60% 5.90%
Downside 1 | United States | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.40% 5.00%
Downside 1 | United States | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Downside 1 | United States | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.10% 5.10%
Downside 1 | United States | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.20% 5.70%
Downside 1 | United States | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.10% 5.20%
Downside 1 | United States | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.10% 4.90%
Downside 1 | United States | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (1.50%) 1.10%
Downside 1 | United States | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.40%
Downside 1 | United States | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 6.50%
Downside 1 | United States | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting (3.30%) (2.70%)
Downside 1 | United States | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 0.10% 1.00%
Downside 1 | United States | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.10%
Downside 1 | United States | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.10% 3.50%
Downside 1 | United States | Federal funds rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 5.30%
Downside 1 | United States | Federal funds rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.20%
Downside 1 | United States | Federal funds rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Downside 1 | United States | Federal funds rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 3.40%
Downside 1 | United States | Federal funds rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.30%
Downside 1 | United States | Federal funds rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.30%
Downside 1 | United States | Federal funds rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.70%
Upside 2    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 14.40% 17.40%
Upside 2 | UK | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 14.50% 15.00%
Upside 2 | UK | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 2.60%
Upside 2 | UK | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.00%
Upside 2 | UK | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 3.00%
Upside 2 | UK | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.70%
Upside 2 | UK | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 2.90%
Upside 2 | UK | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 2 | UK | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.40%
Upside 2 | UK | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.70%
Upside 2 | UK | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.30%
Upside 2 | UK | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 3.80%
Upside 2 | UK | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.00% 3.40%
Upside 2 | UK | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 2 | UK | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.80% 3.50%
Upside 2 | UK | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 34.60% 36.30%
Upside 2 | UK | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.10% 6.40%
Upside 2 | UK | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 2.80%
Upside 2 | UK | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 11.90% 11.90%
Upside 2 | UK | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 8.40% 8.40%
Upside 2 | UK | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.10% 5.10%
Upside 2 | UK | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 4.10%
Upside 2 | UK | Bank rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.80%
Upside 2 | UK | Bank rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.50%
Upside 2 | UK | Bank rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Upside 2 | UK | Bank rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.90%
Upside 2 | UK | Bank rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.90%
Upside 2 | UK | Bank rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.30% 2.80%
Upside 2 | UK | Bank rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.80%
Upside 2 | United States | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 14.60% 14.90%
Upside 2 | United States | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.70% 2.90%
Upside 2 | United States | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Upside 2 | United States | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 2 | United States | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.10%
Upside 2 | United States | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 2 | United States | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 2.80%
Upside 2 | United States | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | United States | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.70%
Upside 2 | United States | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Upside 2 | United States | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.80%
Upside 2 | United States | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | United States | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | United States | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.50%
Upside 2 | United States | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 26.20% 30.10%
Upside 2 | United States | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 5.40%
Upside 2 | United States | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 6.50%
Upside 2 | United States | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 6.20% 6.20%
Upside 2 | United States | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.70%
Upside 2 | United States | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.80% 4.80%
Upside 2 | United States | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.90% 4.90%
Upside 2 | United States | Federal funds rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 2.80%
Upside 2 | United States | Federal funds rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.90% 3.60%
Upside 2 | United States | Federal funds rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Upside 2 | United States | Federal funds rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.00% 3.70%
Upside 2 | United States | Federal funds rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 3.30%
Upside 2 | United States | Federal funds rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 3.10%
Upside 2 | United States | Federal funds rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.50% 2.80%
Upside 1    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 27.40% 26.80%
Upside 1 | UK | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 10.80% 11.60%
Upside 1 | UK | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.00% 2.00%
Upside 1 | UK | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 1.00%
Upside 1 | UK | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.20%
Upside 1 | UK | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.60%
Upside 1 | UK | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.20% 2.20%
Upside 1 | UK | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.90% 2.00%
Upside 1 | UK | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 3.90%
Upside 1 | UK | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.00%
Upside 1 | UK | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.30%
Upside 1 | UK | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.60% 4.10%
Upside 1 | UK | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.00%
Upside 1 | UK | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.40% 4.00%
Upside 1 | UK | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.30% 4.00%
Upside 1 | UK | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 24.90% 25.90%
Upside 1 | UK | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.50% 4.70%
Upside 1 | UK | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 1.50% 2.80%
Upside 1 | UK | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 7.40% 7.60%
Upside 1 | UK | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 5.40% 4.90%
Upside 1 | UK | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.70% 4.80%
Upside 1 | UK | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.90% 3.50%
Upside 1 | UK | Bank rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.30%
Upside 1 | UK | Bank rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 3.90%
Upside 1 | UK | Bank rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Upside 1 | UK | Bank rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 4.10%
Upside 1 | UK | Bank rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.50%
Upside 1 | UK | Bank rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.40%
Upside 1 | UK | Bank rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.10% 3.30%
Upside 1 | United States | GDP | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 12.40% 12.80%
Upside 1 | United States | GDP | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.50%
Upside 1 | United States | GDP | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.10% 2.70%
Upside 1 | United States | GDP | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 1 | United States | GDP | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.60% 2.60%
Upside 1 | United States | GDP | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 1 | United States | GDP | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.40% 2.40%
Upside 1 | United States | Unemployment | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.80%
Upside 1 | United States | Unemployment | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.90%
Upside 1 | United States | Unemployment | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.10%
Upside 1 | United States | Unemployment | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 4.00%
Upside 1 | United States | Unemployment | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.90%
Upside 1 | United States | Unemployment | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.90%
Upside 1 | United States | Unemployment | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.10% 3.90%
Upside 1 | United States | HPI | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 19.30% 24.40%
Upside 1 | United States | HPI | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.60% 4.50%
Upside 1 | United States | HPI | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 6.50%
Upside 1 | United States | HPI | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.00% 4.40%
Upside 1 | United States | HPI | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 3.70%
Upside 1 | United States | HPI | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.90%
Upside 1 | United States | HPI | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.70% 3.90%
Upside 1 | United States | Federal funds rate | Specific bases    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.30%
Upside 1 | United States | Federal funds rate | 5-year averages    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.20% 4.00%
Upside 1 | United States | Federal funds rate | Not more than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 4.20% 5.10%
Upside 1 | United States | Federal funds rate | One to two years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.30% 4.00%
Upside 1 | United States | Federal funds rate | Two to three years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.80%
Upside 1 | United States | Federal funds rate | Three to four years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 2.80% 3.60%
Upside 1 | United States | Federal funds rate | Four to five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Scenario probability weighting 3.00% 3.30%