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Expected credit loss measurement - Coverage ratios (Detail 1) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Disclosure Of Credit Risk Exposure [Line Items]      
Financial Assets And Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts In Core Loan Portfolio $ 890,690 $ 516,563 $ 538,065
ECL coverage 0.35% 0.23% 0.22%
Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 1,066,359 $ 731,764 $ 768,640
Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,064,192 729,686 766,407
Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 608,910 390,908 405,633
Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 255,281 165,559 174,400
Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 88,141 50,512 54,305
Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 28,619 14,397 14,431
Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 23,698 11,911 12,694
Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 148,546 114,615 117,924
Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,927 1,840 2,041
Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 5,795 3,202 2,889
Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,549    
Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,886    
Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 60,826 52,551 54,334
Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 2,601 $ 2,615 $ 2,615
Stages 1 and 2      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.11% 0.10% 0.10%
Twelve-month expected credit losses | Stages 1 and 2      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial Assets And Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts In Core Loan Portfolio $ 849,630 $ 491,364 $ 512,129
ECL coverage 0.07% 0.06% 0.06%
Twelve-month expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 1,035,137 $ 711,317 $ 748,015
Twelve-month expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,032,970 709,239 745,782
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 578,841 370,978 385,493
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 244,008 155,129 163,617
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 83,214 46,668 50,252
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 23,612 12,186 12,594
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 19,766 10,027 10,662
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 147,529 114,580 117,874
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,479 1,402 1,564
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 5,558 3,180 2,873
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,096    
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,689    
Twelve-month expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 60,098 52,114 53,882
Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,408 2,430 2,422
Lifetime expected credit losses | Stages 1 and 2      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial Assets And Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts In Core Loan Portfolio $ 33,668 $ 22,191 $ 22,958
ECL coverage 1.10% 1.01% 1.05%
Lifetime expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 26,456 $ 18,287 $ 18,475
Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 26,456 18,287 18,475
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25,506 17,908 18,131
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 10,104 9,617 9,955
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,580 3,830 4,038
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,867 1,689 1,331
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,591 1,366 1,524
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 880 0 0
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 408 399 438
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 222 11 12
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 427    
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 120    
Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 537 299 312
Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 83 70 79
Lifetime expected credit losses | Stage 3      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial Assets And Exposure To Credit Risk On Loan Commitments And Financial Guarantee Contracts In Core Loan Portfolio $ 7,391 $ 3,008 $ 2,978
ECL coverage 29.00% 21.89% 21.57%
Lifetime expected credit losses | Stage 3 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 4,766 $ 2,160 $ 2,150
Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,766 2,160 2,150
Lifetime expected credit losses | Stage 3 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,563 2,022 2,009
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,169 813 828
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 347 13 15
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,140 522 506
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,341 518 508
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 137 35 50
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 40 38 39
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 16 11 4
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25    
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 78    
Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 191 138 141
Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 110 115 114
Gross carrying amount | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 614,254 394,508 409,232
Gross carrying amount | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 343,708 216,260 228,906
Gross carrying amount | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 53,929 26,832 27,627
Gross carrying amount | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 216,617 151,416 152,699
Gross carrying amount | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 255,462 165,707 174,555
Gross carrying amount | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 88,246 50,552 54,351
Gross carrying amount | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 29,360 14,667 14,671
Gross carrying amount | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 24,569 12,165 12,956
Gross carrying amount | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 148,647 114,634 117,946
Gross carrying amount | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,968 1,879 2,083
Gross carrying amount | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 5,945 3,313 3,008
Gross carrying amount | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,591    
Gross carrying amount | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,998    
Gross carrying amount | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 45,821 28,926 26,997
Gross carrying amount | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,647 2,664 2,665
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 581,607 373,579 388,092
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 327,305 201,854 213,928
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 43,532 22,280 23,324
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 210,770 149,445 150,840
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 244,063 155,168 163,656
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 83,242 46,686 50,272
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 23,705 12,221 12,628
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 19,827 10,060 10,696
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 147,536 114,585 117,879
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,485 1,408 1,571
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 5,576 3,187 2,881
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,134    
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,709    
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 42,918 27,830 26,083
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,412 2,435 2,426
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25,889 18,151 18,396
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 14,792 13,550 14,107
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 6,593 3,108 2,911
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,504 1,493 1,378
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 10,181 9,698 10,044
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,611 3,852 4,063
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,962 1,723 1,363
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,631 1,385 1,548
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 882 0 0
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 419 410 449
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 224 11 12
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 432    
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 141    
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,322 1,001 837
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 84 71 80
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 6,758 2,778 2,744
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,610 856 872
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,804 1,444 1,392
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,343 478 481
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,217 842 856
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 393 14 16
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,693 723 680
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,112 721 712
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 229 49 67
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 64 61 63
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 144 115 115
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25    
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 149    
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 581 96 77
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 151 157 159
Allowance for expected credit loss | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (3,148) (1,059) (1,057)
Allowance for expected credit loss | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (3,148) $ (1,059) $ (1,057)
Allowance for expected credit loss | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.45% 0.25% 0.24%
Allowance for expected credit loss | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.08% 0.09% 0.09%
Allowance for expected credit loss | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.99% 1.95% 1.82%
Allowance for expected credit loss | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.39% 0.18% 0.18%
Allowance for expected credit loss | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2,696) $ (936) $ (935)
Allowance for expected credit loss | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (181) $ (148) $ (156)
ECL coverage 0.07% 0.09% 0.09%
Allowance for expected credit loss | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (104) $ (41) $ (46)
ECL coverage 0.12% 0.08% 0.09%
Allowance for expected credit loss | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (741) $ (269) $ (241)
ECL coverage 2.53% 1.84% 1.64%
Allowance for expected credit loss | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (871) $ (255) $ (262)
ECL coverage 3.54% 2.09% 2.02%
Allowance for expected credit loss | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (101) $ (19) $ (22)
ECL coverage 0.07% 0.02% 0.02%
Allowance for expected credit loss | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (41) $ (40) $ (42)
ECL coverage 2.08% 2.11% 2.00%
Allowance for expected credit loss | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (149) $ (110) $ (119)
ECL coverage 2.51% 3.34% 3.94%
Allowance for expected credit loss | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (42)    
ECL coverage 0.49%    
Allowance for expected credit loss | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (112)    
ECL coverage 3.74%    
Allowance for expected credit loss | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.77% 0.19% 0.18%
Allowance for expected credit loss | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (148) $ (90) $ (87)
Allowance for expected credit loss | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (47) $ (49) $ (49)
ECL coverage 1.76% 1.86% 1.85%
Allowance for expected credit loss | Stages 1 and 2 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.11% 0.09% 0.09%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.06% 0.07% 0.08%
Increase Decrease Expected Credit Loss Rate (0.01%)    
Allowance for expected credit loss | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.58% 0.47% 0.48%
Increase Decrease Expected Credit Loss Rate 0.11%    
Allowance for expected credit loss | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.08% 0.04% 0.04%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.05% 0.07% 0.07%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.07% 0.08% 0.08%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.68% 0.49% 0.48%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.45% 0.45% 0.47%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.01% 0.00% 0.00%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.86% 0.89% 0.87%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.35% 0.21% 0.25%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.50%    
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.44%    
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.10% 0.10% 0.11%
Allowance for expected credit loss | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.22% 0.27% 0.20%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (396) $ (191) $ (197)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (396) $ (191) $ (197)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.06% 0.05% 0.05%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.03% 0.03% 0.03%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.35% 0.30% 0.29%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.06% 0.03% 0.03%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (354) $ (165) $ (173)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (56) $ (38) $ (39)
ECL coverage 0.02% 0.02% 0.02%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (28) $ (18) $ (20)
ECL coverage 0.03% 0.04% 0.04%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (93) $ (34) $ (34)
ECL coverage 0.39% 0.28% 0.27%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (60) $ (33) $ (34)
ECL coverage 0.31% 0.33% 0.32%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (7) $ (5) $ (5)
ECL coverage 0.00% 0.00% 0.00%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (6) $ (6) $ (6)
ECL coverage 0.39% 0.41% 0.40%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (18) $ (7) $ (7)
ECL coverage 0.33% 0.21% 0.25%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (38)    
ECL coverage 0.47%    
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (20)    
ECL coverage 0.74%    
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.07% 0.09% 0.10%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (34) $ (17) $ (16)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (4) $ (6) $ (4)
ECL coverage 0.18% 0.23% 0.17%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (535) $ (202) $ (217)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (535) $ (202) $ (217)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.16% 0.95% 1.01%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.73% 0.77% 0.81%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.05% 1.70% 1.93%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.27% 1.05% 1.17%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (299) $ (171) $ (185)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (77) $ (81) $ (89)
ECL coverage 0.76% 0.84% 0.88%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (31) $ (23) $ (25)
ECL coverage 0.66% 0.59% 0.61%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (95) $ (34) $ (32)
ECL coverage 2.40% 1.97% 2.37%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (40) $ (19) $ (24)
ECL coverage 1.51% 1.36% 1.55%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2) $ 0 $ 0
ECL coverage 0.18% 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (11) $ (10) $ (11)
ECL coverage 2.52% 2.56% 2.53%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2) $ 0 $ 0
ECL coverage 0.97% 0.78% 0.62%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (4)    
ECL coverage 1.03%    
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (21)    
ECL coverage 15.06%    
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.68% 0.39% 0.44%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (8) $ (5) $ (5)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (1) $ (1) $ (1)
ECL coverage 1.46% 1.60% 1.22%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2,217) $ (667) $ (643)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2,217) $ (667) $ (643)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 30.86% 23.10% (22.63%)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total real estate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 5.85% 3.38% 3.31%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 34.80% 27.97% 27.14%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total other lending      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 49.67% 43.69% 44.62%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (2,044) $ (599) $ (577)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (48) $ (28) $ (28)
ECL coverage 3.97% 3.36% 3.26%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (46) $ (1) $ (1)
ECL coverage 11.67% 4.82% 5.94%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (553) $ (201) $ (174)
ECL coverage 32.68% 27.78% 25.58%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (771) $ (203) $ (204)
ECL coverage 36.49% 28.16% 28.61%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (92) $ (14) $ (17)
ECL coverage 40.24% 28.36% 24.87%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (25) $ (23) $ (24)
ECL coverage 38.26% 38.02% 38.01%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (129) $ (104) $ (111)
ECL coverage 89.10% 90.33% 96.76%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 0    
ECL coverage 0.00%    
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (71)    
ECL coverage 47.71%    
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 53.28% 26.30% 23.79%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (106) $ (68) $ (66)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ (41) $ (43) $ (44)
ECL coverage 27.36% 27.16% 27.93%