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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 $ 286,160 $ 130,879 $ 139,206
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      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 276,436 $ 122,055 $ 128,833
ECL coverage 0.12% 0.15% 0.15%
Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 8,090 $ 5,299 $ 6,801
ECL coverage 0.05% 0.09% 0.08%
Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 12,715 $ 8,015 $ 10,662
ECL coverage 0.05% 0.05% 0.06%
Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 20,805 $ 13,315 $ 17,463
ECL coverage 0.05% 0.06% 0.06%
Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 71,091 $ 35,528 $ 34,829
ECL coverage 0.25% 0.27% 0.27%
Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 15,520 $ 7,101 $ 7,872
ECL coverage 0.51% 0.45% 0.47%
Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 86,611 $ 42,629 $ 42,702
ECL coverage 0.30% 0.30% 0.30%
Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 68,071 $ 11,941 $ 13,609
ECL coverage 0.01% 0.04% 0.01%
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 $ 3,701 $ 2,340 $ 2,354
ECL coverage 0.09% 0.03% 0.04%
Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,836    
ECL coverage 0.11%    
Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 152    
ECL coverage 0.00%    
Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 47,842 $ 24,192 $ 25,378
ECL coverage 0.03% 0.05% 0.05%
Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 37,362 $ 17,590 $ 16,869
ECL coverage 0.08% 0.09% 0.12%
Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 169,020 $ 66,112 $ 68,668
ECL coverage 0.04% 0.07% 0.07%
Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.11% 0.10% 0.10%
Stages 1 and 2 | Total      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.10% 0.13% 0.13%
Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.09% 0.08%
Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.05% 0.06%
Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.06% 0.06%
Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.22% 0.26% 0.25%
Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.35% 0.42% 0.41%
Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.25% 0.29% 0.28%
Increase Decrease Expected Credit Loss Rate (0.04%)    
Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.00% 0.01% 0.01%
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 0.09% 0.03% 0.04%
Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.11%    
Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.00%    
Stages 1 and 2 | Total | Financial intermediaries and hedge funds      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.03% 0.05% 0.05%
Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.05% 0.06% 0.08%
Stages 1 and 2 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
ECL coverage 0.03% 0.05% 0.06%
Twelve-month expected credit losses | Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 277,748 $ 126,609 $ 134,410
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      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 268,023 $ 117,785 $ 124,037
ECL coverage 0.07% 0.10% 0.09%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,833 $ 5,049 $ 6,560
ECL coverage 0.04% 0.08% 0.07%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 12,143 $ 7,573 $ 10,064
ECL coverage 0.06% 0.07% 0.05%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 19,975 $ 12,622 $ 16,624
ECL coverage 0.05% 0.07% 0.06%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 66,060 $ 33,312 $ 32,446
ECL coverage 0.17% 0.17% 0.16%
Twelve-month expected credit losses | Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 14,590 $ 6,655 $ 7,337
ECL coverage 0.27% 0.30% 0.29%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 80,650 $ 39,966 $ 39,782
ECL coverage 0.19% 0.19% 0.18%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 68,017 $ 11,940 $ 13,609
ECL coverage 0.00% 0.01% 0.01%
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 $ 3,681 $ 2,332 $ 2,346
ECL coverage 0.08% 0.02% 0.04%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,817    
ECL coverage 0.12%    
Twelve-month expected credit losses | Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 152    
ECL coverage 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 $ 47,381 $ 23,934 $ 25,148
ECL coverage 0.02% 0.04% 0.04%
Twelve-month expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 36,774 $ 17,430 $ 16,596
ECL coverage 0.05% 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 $ 167,398 $ 65,197 $ 67,630
ECL coverage 0.02% 0.04% 0.04%
Lifetime expected credit losses | Stages 1 and 2      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,779 $ 4,041 $ 4,562
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      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 7,779 $ 4,041 $ 4,562
ECL coverage 0.92% 1.26% 1.22%
Lifetime expected credit losses | Stages 1 and 2 | Total | Private clients with mortgages      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 226 $ 222 $ 226
ECL coverage 0.32% 0.31% 0.29%
Lifetime expected credit losses | Stages 1 and 2 | Total | Real estate financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 572 $ 442 $ 599
ECL coverage 0.00% 0.00% 0.22%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 799 $ 664 $ 824
ECL coverage 0.00% 0.00% 0.24%
Lifetime expected credit losses | Stages 1 and 2 | Total | Large corporate clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 4,833 $ 2,095 $ 2,259
ECL coverage 1.00% 1.63% 1.47%
Lifetime expected credit losses | Stages 1 and 2 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 719 $ 381 $ 456
ECL coverage 2.07% 2.58% 2.30%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 5,553 $ 2,476 $ 2,715
ECL coverage 1.14% 1.77% 1.61%
Lifetime expected credit losses | Stages 1 and 2 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 40 $ 0 $ 0
ECL coverage 0.16% 0.00% 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 $ 8 $ 8
ECL coverage 0.53% 0.42% 0.36%
Lifetime expected credit losses | Stages 1 and 2 | Total | Ship / aircraft financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 19    
ECL coverage 0.00%    
Lifetime expected credit losses | Stages 1 and 2 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0    
ECL coverage 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 $ 258 $ 230
ECL coverage 0.76% 1.34% 1.57%
Lifetime expected credit losses | Stages 1 and 2 | Total | Other off-balance sheet commitments      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 411 $ 151 $ 264
ECL coverage 0.67% 1.78% 1.70%
Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 1,427 $ 901 $ 1,024
ECL coverage 0.57% 0.87% 0.97%
Lifetime expected credit losses | Stage 3      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 633 $ 230 $ 234
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      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 633 $ 230 $ 234
ECL coverage 9.14% 7.17% 9.08%
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 $ 198 $ 121 $ 125
ECL coverage 9.04% 3.99% 6.28%
Lifetime expected credit losses | Stage 3 | Total | SME clients      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 210 $ 65 $ 80
ECL coverage 12.06% 3.42% 6.26%
Lifetime expected credit losses | Stage 3 | Total | Total corporate lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 408 $ 187 $ 205
ECL coverage 10.60% 3.79% 6.27%
Lifetime expected credit losses | Stage 3 | Total | Lombard      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 14 $ 1 $ 1
ECL coverage 27.06% 0.00% 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    
ECL coverage 0.00%    
Lifetime expected credit losses | Stage 3 | Total | Consumer financing      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 0    
ECL coverage 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 $ 177 $ 9 $ 9
ECL coverage 6.11% 0.00% 0.00%
Lifetime expected credit losses | Stage 3 | Total | Total other lending      
Disclosure Of Provision Matrix [Line Items]      
Total exposure $ 195 $ 14 $ 14
ECL coverage 7.51% 66.56% 59.21%