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Expected credit loss measurement - Economic scenarios and weights applied (Detail)
 3 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Asset price inflation      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights 0.00% 0.00% 0.00%
Baseline      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights 60.00% 60.00% 55.00%
Severe Russia-Ukraine conflict scenario      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights     25.00%
Mild debt crisis      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights 15.00%    
Stagflationary Geopolitical Crisis      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights 25.00% 25.00%  
Global crisis      
Disclosure Of Provision Matrix [Line Items]      
Assigned weights   15.00% 20.00%