v3.26.1
Expected credit loss measurement - Coverage ratios (Detail 2) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 207,178 $ 271,231
Total on- and off-balance sheet $ 870,908 $ 925,254
ECL coverage 0.42% 0.39%
Total    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 197,372 $ 260,508
ECL coverage 0.22% 0.13%
Total | Private clients with mortgages    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 15,646 $ 13,016
ECL coverage 0.04% 0.03%
Total | Real estate financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 8,561 $ 7,743
ECL coverage 0.06% 0.07%
Total | Total real estate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 24,207 $ 20,758
ECL coverage 0.05% 0.04%
Total | Large corporate clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 65,722 $ 68,798
ECL coverage 0.45% 0.31%
Total | SME clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 16,914 $ 16,511
ECL coverage 0.51% 0.46%
Total | Total corporate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 82,636 $ 85,308
ECL coverage 0.46% 0.34%
Total | Lombard    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 8,329 $ 65,395
ECL coverage 0.04% 0.02%
Total | Credit cards    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 12,800 $ 12,943
ECL coverage 0.07% 0.07%
Total | Commodity trade finance    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,619 $ 5,490
ECL coverage 0.00% 0.02%
Total | Ship / aircraft financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,602 $ 1,968
ECL coverage 0.06% 0.11%
Total | Consumer financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 165 $ 153
ECL coverage 0.00% 0.00%
Total | Financial intermediaries and hedge funds    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 32,659 $ 37,709
ECL coverage 0.01% 0.01%
Total | Other off-balance sheet commitments    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 33,355 $ 30,782
ECL coverage 0.10% 0.07%
Total | Total other lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 90,529 $ 154,441
ECL coverage 0.05% 0.03%
Stages 1 and 2    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.11% 0.10%
Stages 1 and 2 | Total    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.16% 0.11%
Stages 1 and 2 | Total | Private clients with mortgages    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.04% 0.03%
Stages 1 and 2 | Total | Real estate financing    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.06% 0.07%
Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.05% 0.04%
Stages 1 and 2 | Total | Large corporate clients    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.32% 0.28%
Stages 1 and 2 | Total | SME clients    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.38% 0.39%
Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.33% 0.30%
Stages 1 and 2 | Total | Lombard    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.01% 0.00%
Stages 1 and 2 | Total | Credit cards    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.07% 0.07%
Stages 1 and 2 | Total | Commodity trade finance    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.03% 0.02%
Stages 1 and 2 | Total | Ship / aircraft financing    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.06% 0.11%
Stages 1 and 2 | Total | Consumer financing    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.00% 0.00%
Stages 1 and 2 | Total | Financial intermediaries and hedge funds    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.01% 0.01%
Stages 1 and 2 | Total | Other off-balance sheet commitments    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.05% 0.06%
Stages 1 and 2 | Total | Total other lending    
Disclosure Of Provision Matrix [Line Items]    
ECL coverage 0.04% 0.02%
Twelve-month expected credit losses | Stages 1 and 2    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 196,491 $ 261,761
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    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 186,685 $ 251,038
ECL coverage 0.10% 0.07%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 15,348 $ 12,757
ECL coverage 0.03% 0.02%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Real estate financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 7,280 $ 6,591
ECL coverage 0.12% 0.13%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 22,628 $ 19,348
ECL coverage 0.06% 0.06%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Large corporate clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 59,797 $ 63,753
ECL coverage 0.19% 0.17%
Twelve-month expected credit losses | Stages 1 and 2 | Total | SME clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 15,616 $ 15,531
ECL coverage 0.23% 0.23%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 75,412 $ 79,284
ECL coverage 0.20% 0.18%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Lombard    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 8,304 $ 65,298
ECL coverage 0.01% 0.00%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Credit cards    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 12,158 $ 12,361
ECL coverage 0.06% 0.06%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Commodity trade finance    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,619 $ 5,389
ECL coverage 0.02% 0.02%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,562 $ 1,770
ECL coverage 0.00% 0.02%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Consumer financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 165 $ 153
ECL coverage 0.00% 0.00%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Financial intermediaries and hedge funds    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 32,027 $ 37,307
ECL coverage 0.01% 0.01%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 32,810 $ 30,127
ECL coverage 0.05% 0.05%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 88,645 $ 152,406
ECL coverage 0.03% 0.02%
Lifetime expected credit losses | Stages 1 and 2    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 9,946 $ 8,867
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    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 9,946 $ 8,867
ECL coverage 1.23% 1.29%
Lifetime expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 295 $ 245
ECL coverage 0.45% 0.16%
Lifetime expected credit losses | Stages 1 and 2 | Total | Real estate financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,282 $ 1,051
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,577 $ 1,296
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Large corporate clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 5,553 $ 4,860
ECL coverage 1.64% 1.73%
Lifetime expected credit losses | Stages 1 and 2 | Total | SME clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 998 $ 732
ECL coverage 2.77% 3.86%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 6,552 $ 5,592
ECL coverage 1.81% 2.01%
Lifetime expected credit losses | Stages 1 and 2 | Total | Lombard    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 64
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Credit cards    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 638 $ 578
ECL coverage 0.36% 0.34%
Lifetime expected credit losses | Stages 1 and 2 | Total | Commodity trade finance    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 101
ECL coverage 0.00% 0.06%
Lifetime expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 40 $ 198
ECL coverage 2.16% 0.89%
Lifetime expected credit losses | Stages 1 and 2 | Total | Consumer financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 0
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Financial intermediaries and hedge funds    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 611 $ 401
ECL coverage 0.04% 0.05%
Lifetime expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 527 $ 635
ECL coverage 0.35% 0.19%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 1,817 $ 1,978
ECL coverage 0.29% 0.26%
Lifetime expected credit losses | Stage 3    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 741 $ 603
Total on- and off-balance sheet $ 8,170 $ 7,900
ECL coverage 32.67% 34.08%
Lifetime expected credit losses | Stage 3 | Total    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 741 $ 603
ECL coverage 17.27% 8.06%
Lifetime expected credit losses | Stage 3 | Total | Private clients with mortgages    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 3 $ 13
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Real estate financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 101
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Total real estate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 3 $ 114
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Large corporate clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 372 $ 184
ECL coverage 24.60% 14.03%
Lifetime expected credit losses | Stage 3 | Total | SME clients    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 300 $ 247
ECL coverage 7.47% 4.68%
Lifetime expected credit losses | Stage 3 | Total | Total corporate lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 673 $ 432
ECL coverage 16.96% 8.68%
Lifetime expected credit losses | Stage 3 | Total | Lombard    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 25 $ 33
ECL coverage 8.75% 21.51%
Lifetime expected credit losses | Stage 3 | Total | Credit cards    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 3 $ 4
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Commodity trade finance    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 0
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Ship / aircraft financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 0
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Consumer financing    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 0 $ 0
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Financial intermediaries and hedge funds    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 21 $ 0
ECL coverage 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Other off-balance sheet commitments    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 17 $ 20
ECL coverage 83.11% 20.53%
Lifetime expected credit losses | Stage 3 | Total | Total other lending    
Disclosure Of Provision Matrix [Line Items]    
Total exposure $ 66 $ 57
ECL coverage 21.13% 19.63%