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Net fee and commission income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net fee And Commission Income [Line Items]          
Underwriting Fees $ 153 $ 127 $ 111 $ 280 $ 283
M&A and corporate finance fees 199 178 220 378 456
Brokerage fees 930 880 869 1,809 1,946
Investment fund fees 1,196 1,178 1,233 2,374 2,620
Portfolio management and related services 2,485 2,210 2,298 4,695 4,761
Other 719 479 492 1,199 993
Total fee and commission income 5,682 5,053 5,224 10,735 11,061
Fee and commission expense 507 447 450 954 934
Net fee and commission income 5,175 4,606 4,774 9,781 10,127
Credit Suisse          
Net fee And Commission Income [Line Items]          
Total fee and commission income 675        
Global Wealth Management          
Net fee And Commission Income [Line Items]          
Total fee and commission income 3,134 3,145 3,281    
Personal & Corporate Banking          
Net fee And Commission Income [Line Items]          
Total fee and commission income 465 449 421    
Asset Management          
Net fee And Commission Income [Line Items]          
Total fee and commission income 673 687 720    
Investment Bank          
Net fee And Commission Income [Line Items]          
Total fee and commission income 731 770 801    
Group Functions          
Net fee And Commission Income [Line Items]          
Total fee and commission income 4 3 1    
of which: recurring          
Net fee And Commission Income [Line Items]          
Total fee and commission income 3,808 3,413 3,593 7,221 7,453
of which: transaction-based          
Net fee And Commission Income [Line Items]          
Total fee and commission income 1,864 1,616 1,621 3,480 3,579
of which: performance-based          
Net fee And Commission Income [Line Items]          
Total fee and commission income $ 10 $ 24 $ 10 $ 34 $ 29