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Expected credit loss measurement - ECL for the period (Narrative) (Detail 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) $ (80) $ (28) $ 272 $ (108) $ 540
Personal & Corporate Banking          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (46)     (69) 187
Global Wealth Management          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (14)     (16) 117
Investment Bank          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (21)     (23) 200
Group Functions          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 1     $ 1 $ 35
Positions that are not credit impaired          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (88)        
Positions that are not credit impaired | Post-model expense adjustment updates          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (91)        
Positions that are not credit impaired | Scenario-driven model output effects - cumulative          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (273)        
Positions that are not credit impaired | Scenario-driven model output effects - retained          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (183)        
Positions that are not credit impaired | Personal & Corporate Banking          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (51)        
Positions that are not credit impaired | Global Wealth Management          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (13)        
Positions that are not credit impaired | Investment Bank          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) (24)        
Positions that are not credit impaired | Group Functions          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 1        
Credit-impaired positions          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 8        
Credit-impaired positions | Personal & Corporate Banking          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 5        
Credit-impaired positions | Global Wealth Management          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 0        
Credit-impaired positions | Investment Bank          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) 3        
Credit-impaired positions | Group Functions          
Disclosure Of Provision Matrix [Line Items]          
Credit loss expense / (release) $ 0