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Expected credit loss measurement - ECL selection of key macro-economic variables (Detail) - Baseline ECL scenario
 3 Months Ended
Jun. 30, 2021
2020 | Real GDP growth (annual percentage change) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast (3.60%)
2020 | Real GDP growth (annual percentage change) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast (7.40%)
2020 | Real GDP growth (annual percentage change) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast (4.50%)
2020 | Unemployment rate (%, annual average) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 8.10%
2020 | Unemployment rate (%, annual average) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 8.50%
2020 | Unemployment rate (%, annual average) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.20%
2020 | Real estate (annual percentage change, Q4) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.40%
2020 | Real estate (annual percentage change, Q4) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast (0.30%)
2020 | Real estate (annual percentage change, Q4) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 4.00%
2021 | Real GDP growth (annual percentage change) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 6.90%
2021 | Real GDP growth (annual percentage change) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 4.30%
2021 | Real GDP growth (annual percentage change) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.30%
2021 | Unemployment rate (%, annual average) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 5.40%
2021 | Unemployment rate (%, annual average) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 8.60%
2021 | Unemployment rate (%, annual average) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.30%
2021 | Real estate (annual percentage change, Q4) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 6.50%
2021 | Real estate (annual percentage change, Q4) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 2.90%
2021 | Real estate (annual percentage change, Q4) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 5.00%
2022 | Real GDP growth (annual percentage change) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 5.90%
2022 | Real GDP growth (annual percentage change) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 5.30%
2022 | Real GDP growth (annual percentage change) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.00%
2022 | Unemployment rate (%, annual average) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 4.40%
2022 | Unemployment rate (%, annual average) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 8.10%
2022 | Unemployment rate (%, annual average) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 3.10%
2022 | Real estate (annual percentage change, Q4) | United States  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 2.90%
2022 | Real estate (annual percentage change, Q4) | Eurozone  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 1.00%
2022 | Real estate (annual percentage change, Q4) | Switzerland  
Disclosure of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]  
Economic forecast 1.00%