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Expected credit loss measurement - Coverage ratios (Detail 1) - Total - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Gross carrying amount      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 393,594 [1] $ 380,369 [2] $ 383,266 [3]
Gross carrying amount | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 147,966 142,770 148,341
Gross carrying amount | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 42,677 41,148 43,492
Gross carrying amount | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 14,540 13,577 15,440
Gross carrying amount | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 14,407 14,317 15,183
Gross carrying amount | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 146,202 141,173 133,886
Gross carrying amount | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,644 1,425 1,596
Gross carrying amount | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,503 3,796 3,375
Gross carrying amount | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 20,137 19,585 19,274
Gross carrying amount | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,518 2,578 2,677
Gross carrying amount | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 391,076 377,791 380,589
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 371,880 [1] 357,911 [2] 359,099 [3]
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 137,877 132,673 138,803
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 37,967 36,113 37,583
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 12,691 11,184 12,684
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 11,772 11,639 12,010
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 146,141 141,117 133,800
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,264 1,073 1,209
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,350 3,668 3,219
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 18,871 18,458 17,781
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,946 1,987 2,009
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 18,762 [1] 19,290 [2] 20,697 [3]
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 9,216 9,204 8,540
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,696 5,020 5,883
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,247 1,701 2,069
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,833 1,905 2,277
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 336 309 342
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 38 16 43
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,193 1,024 1,402
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 202 111 142
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,952 [1] 3,167 [2] 3,470 [3]
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 874 893 998
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 14 15 27
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 602 692 686
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 802 773 896
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 61 56 86
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 44 44 46
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 114 111 113
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 73 103 91
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets $ 369 $ 480 $ 526
Allowance for expected credit loss      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.27% [1] 0.29% [2] 0.30% [3]
Allowance for expected credit loss | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.09% 0.11% 0.11%
Allowance for expected credit loss | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.12% 0.14% 0.15%
Allowance for expected credit loss | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.69% 2.00% 1.81%
Allowance for expected credit loss | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.02% 1.98% 2.04%
Allowance for expected credit loss | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.02% 0.02% 0.03%
Allowance for expected credit loss | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.05% 2.33% 2.40%
Allowance for expected credit loss | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.95% 2.67% 3.15%
Allowance for expected credit loss | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.26% 0.28% 0.31%
Allowance for expected credit loss | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 4.08% 4.05% 4.04%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.04% [1] 0.05% [2] 0.05% [3]
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.02% 0.03% 0.02%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.04% 0.04% 0.04%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.16% 0.25% 0.21%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.17% 0.16% 0.16%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.00% 0.00% 0.00%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.72% 0.88% 0.91%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.15% 0.14% 0.16%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.11% 0.11% 0.14%
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.16% 1.31% 1.35%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.86% [1] 0.97% 1.06% [3]
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.82% 0.93% 1.08%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.69% 0.81% 0.75%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.51% 1.62% 1.92%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.02% 0.98% 1.01%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.00% 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.61% 2.66% 3.33%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.02% 0.02% 0.02%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 0.13% 0.26% 0.25%
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 2.90% 3.37% 3.51%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 25.21% [1] 23.55% [2] 22.47% [3]
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 4.27% 3.96% 3.90%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 1.01% 0.78% 14.14%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 34.46% 31.14% 30.89%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 31.52% 31.79% 29.91%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 46.98% 52.60% 35.92%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 36.08% 35.55% 34.88%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 86.05% 86.20% 89.39%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Other loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 40.51% 32.11% 35.63%
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
ECL coverage 20.16% 15.58% 14.46%
[1] <div>Includes Loans and advances to customers of USD 391,076 million and Loans to financial advisors of USD 2,518 million, which are presented on the balance sheet line Other assets measured at amortized cost</div>
[2] <div>Includes Loans and advances to customers of USD 377,791 million and Loans to financial advisors of USD 2,578 million, which are presented on the balance sheet line Other assets measured at amortized cost</div>
[3] <div>Includes Loans and advances to customers of USD 380,589 million and Loans to financial advisors of USD 2,677 million, which are presented on the balance sheet line Other assets measured at amortized cost</div>