v3.26.1
Expected credit loss measurement - Coverage ratios (Detail 1) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 870,908 $ 925,254
ECL coverage 0.42% 0.39%
Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 1,125,443 $ 1,098,962
Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,110,926 1,085,094
Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 667,391 658,760
Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 288,702 288,259
Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 94,239 93,076
Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 26,637 26,963
Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 23,739 23,941
Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,990 165,336
Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,535 2,408
Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,498 4,849
Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,097 8,753
Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,988 2,957
Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 72,437 72,025
Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 2,947 $ 2,716
Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.11% 0.10%
Twelve-month expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 823,865 $ 882,875
ECL coverage 0.07% 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 $ 1,090,669 $ 1,067,267
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 1,076,152 1,053,400
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 634,006 628,914
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 274,962 277,176
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 86,428 87,650
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 23,250 23,146
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 19,718 19,984
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,623 164,890
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 1,934 1,860
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 4,726 3,570
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 8,145 7,609
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 2,760 2,699
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 71,241 70,552
Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,806 2,567
Lifetime expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 38,872 $ 34,479
ECL coverage 1.05% 1.12%
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 $ 29,705 $ 26,911
Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 29,705 26,911
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 28,591 25,287
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 12,069 9,635
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 7,396 5,307
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 2,845 2,890
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,623 2,551
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 169
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 550 501
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 772 1,274
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 883 1,025
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 121 130
Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 927 1,247
Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 48 53
Lifetime expected credit losses | Stage 3    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 8,170 $ 7,900
ECL coverage 32.67% 34.08%
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 $ 5,068 $ 4,784
Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,068 4,784
Lifetime expected credit losses | Stage 3 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,794 4,559
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,671 1,448
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 415 119
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 543 928
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,399 1,406
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 368 276
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51 47
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 6
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 69 119
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 106 129
Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 269 225
Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93 95
Gross carrying amount | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 673,536 664,747
Gross carrying amount | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 383,177 381,538
Gross carrying amount | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 52,722 53,219
Gross carrying amount | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 237,637 229,989
Gross carrying amount | Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 288,850 288,393
Gross carrying amount | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 94,327 93,145
Gross carrying amount | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 27,537 27,973
Gross carrying amount | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 25,184 25,246
Gross carrying amount | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 166,064 165,466
Gross carrying amount | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,588 2,456
Gross carrying amount | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,624 4,986
Gross carrying amount | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,109 8,771
Gross carrying amount | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,159 3,124
Gross carrying amount | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 48,110 42,437
Gross carrying amount | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,982 2,750
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 637,180 631,837
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 361,457 364,896
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 43,164 43,327
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 232,559 223,614
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 275,003 277,220
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 86,454 87,676
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 23,354 23,263
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 19,810 20,064
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 165,628 164,896
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 1,941 1,867
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 4,736 3,593
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 8,152 7,618
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 2,789 2,718
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 46,504 40,351
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 2,809 2,571
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 28,927 25,612
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 19,514 14,991
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,654 5,616
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,758 5,006
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 12,092 9,653
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 7,422 5,337
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 2,946 2,984
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 2,709 2,632
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 0 169
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 564 513
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 772 1,274
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 887 1,033
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 146 154
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 1,340 1,809
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 49 54
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 7,429 7,298
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,206 1,651
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,903 4,276
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,320 1,370
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 1,755 1,520
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 451 132
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 1,238 1,726
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 2,666 2,550
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 436 401
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 83 76
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 116 118
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 69 119
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 224 252
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 267 278
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 124 125
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 (3,576) (3,635)
Allowance for expected credit loss | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (3,576) $ (3,635)
Allowance for expected credit loss | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.47% 0.49%
Allowance for expected credit loss | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.06% 0.05%
Allowance for expected credit loss | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 4.20% 4.35%
Allowance for expected credit loss | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.31% 0.33%
Allowance for expected credit loss | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (3,162) $ (3,236)
Allowance for expected credit loss | Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (148) $ (134)
ECL coverage 0.05% 0.05%
Allowance for expected credit loss | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (89) $ (68)
ECL coverage 0.09% 0.07%
Allowance for expected credit loss | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (767) $ (1,009)
ECL coverage 2.79% 3.61%
Allowance for expected credit loss | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (1,445) $ (1,305)
ECL coverage 5.74% 5.17%
Allowance for expected credit loss | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (74) $ (130)
ECL coverage 0.04% 0.08%
Allowance for expected credit loss | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (53) $ (48)
ECL coverage 2.04% 1.97%
Allowance for expected credit loss | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (141) $ (136)
ECL coverage 2.50% 2.73%
Allowance for expected credit loss | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (11) $ (17)
ECL coverage 0.12% 0.20%
Allowance for expected credit loss | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (171) $ (167)
ECL coverage 5.42% 5.33%
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 0.55% 0.52%
Allowance for expected credit loss | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (138) $ (122)
Allowance for expected credit loss | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (35) $ (34)
ECL coverage 1.18% 1.25%
Allowance for expected credit loss | Stages 1 and 2 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.10% 0.10%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.03% 0.03%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.79% 0.76%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.07% 0.06%
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 0.02% 0.02%
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 0.06% 0.06%
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 0.78% 0.80%
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 0.79% 0.71%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.00% 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 0.81% 0.80%
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 0.17% 0.17%
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 0.12% 0.20%
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 1.82% 1.51%
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 0.11% 0.09%
Allowance for expected credit loss | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.16% 0.15%
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 $ (398) $ (392)
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 $ (398) $ (392)
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% 0.06%
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 0.02% 0.02%
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 0.45% 0.46%
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 0.05% 0.04%
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 $ (365) $ (352)
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 $ (41) $ (44)
ECL coverage 0.01% 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 $ (26) $ (26)
ECL coverage 0.03% 0.03%
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 $ (104) $ (117)
ECL coverage 0.45% 0.50%
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 $ (92) $ (80)
ECL coverage 0.47% 0.40%
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 $ (5) $ (6)
ECL coverage 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 $ (7) $ (7)
ECL coverage 0.37% 0.37%
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 $ (9) $ (8)
ECL coverage 0.20% 0.22%
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 $ (7) $ (9)
ECL coverage 0.08% 0.12%
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 $ (29) $ (19)
ECL coverage 1.02% 0.69%
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 0.10% 0.09%
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 $ (31) $ (29)
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) $ (3)
ECL coverage 0.13% 0.12%
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 $ (576) $ (546)
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 $ (576) $ (546)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.99% 1.06%
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 0.25% 0.32%
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 3.31% 3.11%
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 1.35% 0.97%
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 $ (286) $ (271)
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 $ (23) $ (18)
ECL coverage 0.19% 0.19%
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 $ (26) $ (30)
ECL coverage 0.35% 0.57%
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 $ (101) $ (94)
ECL coverage 3.44% 3.15%
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 $ (86) $ (81)
ECL coverage 3.17% 3.07%
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 $ 0 $ 0
ECL coverage 10.25% 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 $ (13) $ (12)
ECL coverage 2.33% 2.34%
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 $ 0 $ 0
ECL coverage 0.02% 0.02%
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) $ (8)
ECL coverage 0.50% 0.77%
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 $ (25) $ (24)
ECL coverage 16.96% 15.90%
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 0.56% 0.17%
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 $ (15) $ (9)
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)
ECL coverage 1.95% 1.41%
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 $ (2,603) $ (2,697)
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 $ (2,603) $ (2,697)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 34.21% 36.23%
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 5.45% 5.10%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 46.86% 45.43%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 44.88% 45.04%
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 $ (2,511) $ (2,613)
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 $ (84) $ (72)
ECL coverage 4.77% 4.73%
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 $ (37) $ (12)
ECL coverage 8.09% 9.36%
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 $ (562) $ (798)
ECL coverage 45.42% 46.25%
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 $ (1,267) $ (1,144)
ECL coverage 47.53% 44.87%
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 $ (69) $ (124)
ECL coverage 15.74% 31.07%
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 $ (33) $ (29)
ECL coverage 39.05% 38.67%
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 $ (131) $ (128)
ECL coverage 0.00% 108.00%
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 $ 0
ECL coverage 0.00% 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 $ (118) $ (123)
ECL coverage 52.58% 48.84%
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 79.24% 65.30%
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 $ (91) $ (84)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (31) $ (30)
ECL coverage 24.65% 24.31%