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Accounting for the acquisition of Credit Suisse Group - Determination of the purchase price consideration (Detail) - Credit Suisse
SFr / shares in Units, shares in Millions, SFr in Millions, $ in Millions
 6 Months Ended
Jun. 12, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 12, 2023
CHF (SFr)
SFr / shares
shares
Jun. 12, 2023
USD ($)
shares
Disclosure Of Determination Of The Purchase Price Consideration [Line Items]        
The Credit Suisse Group ordinary shares outstanding | shares     3,949 3,949
Credit Suisse To UBS Exchange Ratio     4.00% 4.00%
UBS Ordinary Shares Equivalent | shares     176 176
UBS Ordinary Share Price | SFr / shares     SFr 18.35  
Impact of share-based compensation awards       $ 162
Provisional purchase price consideration, after consideration of pre-existing relationships       3,845
Net cash and cash equivalents acquired with the Credit Suisse Group (included in cash flows from investing activities) $ 108,510 $ 108,510    
of which: amounts due from banks 12,601      
of which: money market paper $ 2,897      
Purchase price consideration, before consideration of share-based compensation awards using exchange rate of 1.10       3,547
Purchase price consideration, before consideration of share-based compensation awards | SFr     SFr 3,223  
Purchase Price Consideration After Consideration Of Share Based Awards       $ 3,710