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Expected credit loss measurement - Coverage ratios (Detail 2) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 284,611 $ 301,322 $ 324,141
Total on- and off-balance sheet $ 878,385 $ 893,144 $ 949,729
ECL coverage 0.24% 0.23% 0.22%
Total      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 274,888 $ 283,672 $ 305,697
ECL coverage 0.11% 0.12% 0.11%
Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 8,091 $ 7,907 $ 9,782
ECL coverage 0.04% 0.07% 0.06%
Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 12,715 $ 13,652 $ 17,107
ECL coverage 0.05% 0.07% 0.09%
Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 20,805 $ 21,559 $ 26,889
ECL coverage 0.05% 0.07% 0.08%
Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 71,060 $ 73,534 $ 77,103
ECL coverage 0.24% 0.28% 0.26%
Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 15,352 $ 15,269 $ 16,762
ECL coverage 0.33% 0.34% 0.40%
Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 86,412 $ 88,803 $ 93,865
ECL coverage 0.26% 0.29% 0.29%
Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 68,071 $ 68,645 $ 86,173
ECL coverage 0.01% 0.01% 0.00%
Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 10,056 $ 10,049 $ 10,458
ECL coverage 0.08% 0.09% 0.10%
Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 3,732 $ 4,446 $ 4,640
ECL coverage 0.07% 0.06% 0.06%
Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,836 $ 1,643 $ 1,053
ECL coverage 0.11% 0.13% 0.26%
Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 152 $ 167 $ 153
ECL coverage 0.00% 0.00% 0.00%
Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 46,338 $ 48,923 $ 42,578
ECL coverage 0.03% 0.03% 0.03%
Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 37,485 $ 39,437 $ 39,887
ECL coverage 0.07% 0.06% 0.07%
Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 167,670 $ 173,310 $ 184,944
ECL coverage 0.03% 0.03% 0.03%
Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.11% 0.11% 0.11%
Stages 1 and 2 | Total      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.10% 0.11% 0.10%
Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.04% 0.07% 0.06%
Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.07% 0.09%
Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.07% 0.08%
Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.22% 0.25% 0.24%
Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.36% 0.38% 0.37%
Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.25% 0.27% 0.26%
Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.00% 0.00% 0.00%
Stages 1 and 2 | Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.08% 0.09% 0.10%
Stages 1 and 2 | Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.07% 0.06% 0.06%
Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.11% 0.13% 0.26%
Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.00% 0.00% 0.00%
Stages 1 and 2 | Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.03% 0.03% 0.03%
Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.04% 0.04% 0.05%
Stages 1 and 2 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.03% 0.03% 0.03%
Twelve-month expected credit losses | Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 276,199 $ 292,385 $ 315,060
Total on- and off-balance sheet $ 838,722 $ 848,933 $ 910,388
ECL coverage 0.07% 0.07% 0.07%
Twelve-month expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 266,475 $ 274,736 $ 296,616
ECL coverage 0.07% 0.08% 0.08%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,834 $ 7,590 $ 9,505
ECL coverage 0.04% 0.06% 0.05%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 12,143 $ 12,919 $ 16,281
ECL coverage 0.06% 0.08% 0.08%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 19,977 $ 20,509 $ 25,786
ECL coverage 0.05% 0.07% 0.07%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 66,029 $ 68,451 $ 71,524
ECL coverage 0.17% 0.18% 0.17%
Twelve-month expected credit losses | Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 14,421 $ 14,438 $ 15,868
ECL coverage 0.27% 0.29% 0.29%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 80,450 $ 82,889 $ 87,392
ECL coverage 0.19% 0.20% 0.19%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 68,017 $ 68,477 $ 86,173
ECL coverage 0.00% 0.00% 0.00%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 9,576 $ 9,560 $ 9,932
ECL coverage 0.07% 0.08% 0.08%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 3,712 $ 4,429 $ 4,628
ECL coverage 0.07% 0.06% 0.05%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,817 $ 1,643 $ 1,053
ECL coverage 0.11% 0.12% 0.26%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 152 $ 167 $ 153
ECL coverage 0.00% 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 $ 45,878 $ 48,619 $ 42,325
ECL coverage 0.02% 0.02% 0.03%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 36,897 $ 38,444 $ 39,174
ECL coverage 0.04% 0.04% 0.04%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 166,049 $ 171,338 $ 183,438
ECL coverage 0.02% 0.02% 0.02%
Lifetime expected credit losses | Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,779 $ 8,271 $ 8,456
Total on- and off-balance sheet $ 33,409 $ 37,399 $ 33,233
ECL coverage 1.11% 1.00% 1.14%
Lifetime expected credit losses | Stages 1 and 2 | Total      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,778 $ 8,271 $ 8,456
ECL coverage 0.90% 1.06% 1.07%
Lifetime expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 226 $ 289 $ 261
ECL coverage 0.23% 0.34% 0.27%
Lifetime expected credit losses | Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 572 $ 732 $ 826
ECL coverage 0.00% 0.00% 0.44%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 798 $ 1,021 $ 1,088
ECL coverage 0.00% 0.04% 0.40%
Lifetime expected credit losses | Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 4,833 $ 4,881 $ 5,357
ECL coverage 1.00% 1.33% 1.11%
Lifetime expected credit losses | Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 720 $ 678 $ 812
ECL coverage 2.07% 2.16% 1.96%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 5,553 $ 5,559 $ 6,170
ECL coverage 1.14% 1.43% 1.22%
Lifetime expected credit losses | Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 40 $ 161 $ 0
ECL coverage 0.00% 0.01% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 477 $ 485 $ 522
ECL coverage 0.35% 0.34% 0.35%
Lifetime expected credit losses | Stages 1 and 2 | Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 20 $ 18 $ 13
ECL coverage 0.13% 1.27% 1.51%
Lifetime expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 19 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 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 $ 461 $ 304 $ 253
ECL coverage 0.74% 1.14% 1.42%
Lifetime expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 411 $ 723 $ 411
ECL coverage 0.55% 0.40% 1.11%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,427 $ 1,691 $ 1,199
ECL coverage 0.52% 0.49% 0.85%
Lifetime expected credit losses | Stage 3      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 551 $ 593 $ 519
Total on- and off-balance sheet $ 4,923 $ 5,412 $ 4,408
ECL coverage 20.49% 18.38% 21.40%
Lifetime expected credit losses | Stage 3 | Total      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 550 $ 593 $ 519
ECL coverage 5.70% 5.43% 7.17%
Lifetime expected credit losses | Stage 3 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 31 $ 29 $ 15
ECL coverage 0.11% 0.24% 0.40%
Lifetime expected credit losses | Stage 3 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 31 $ 29 $ 15
ECL coverage 0.11% 0.23% 0.40%
Lifetime expected credit losses | Stage 3 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 149 $ 168 $ 157
ECL coverage 9.87% 9.95% 12.17%
Lifetime expected credit losses | Stage 3 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 189 $ 130 $ 80
ECL coverage 1.97% 1.81% 6.40%
Lifetime expected credit losses | Stage 3 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 338 $ 297 $ 236
ECL coverage 5.46% 6.40% 10.22%
Lifetime expected credit losses | Stage 3 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 14 $ 7 $ 1
ECL coverage 28.87% 99.21% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 4 $ 4 $ 4
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 163 $ 256 $ 263
ECL coverage 5.38% 2.57% 4.53%
Lifetime expected credit losses | Stage 3 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 181 $ 267 $ 268
ECL coverage 7.10% 4.93% 4.86%
Lifetime expected credit losses | Purchased credit-impaired (PCI)      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 83 $ 72 $ 106
Total on- and off-balance sheet $ 1,331 $ 1,401 $ 1,699
ECL coverage 12.02% 9.08% 7.06%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 84 $ 72 $ 106
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 49 $ 35 $ 65
ECL coverage 0.00% 0.00% 2.42%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 22 $ 23 $ 2
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 71 $ 58 $ 67
ECL coverage 0.00% 0.00% 2.21%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Credit cards      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Commodity trade finance      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0 $ 0 $ 0
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 13 $ 14 $ 39
ECL coverage 0.00% 0.00% 0.00%
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 13 $ 14 $ 39
ECL coverage 0.00% 0.00% 0.00%