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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>

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