v3.26.1
Expected credit loss measurement - On-balance sheet financial assets subject to ECL (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Credit Risk Exposure [Line Items]    
Total ECL allowances and provisions $ (3,189) $ (3,058)
Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,121,232 1,094,326
Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,106,715 1,080,458
Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 215,716 209,858
Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 20,963 19,649
Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 83,553 83,656
Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51,314 41,552
Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 662,901 653,846
Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 287,595 287,424
Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93,064 92,334
Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 26,646 26,752
Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 23,551 23,805
Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,904 165,320
Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,535 2,408
Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,498 4,849
Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,077 8,753
Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,994 2,966
Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 72,267 71,897
Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,947 2,716
Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 14,517 13,868
Twelve-month expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total ECL allowances and provisions (589) (576)
Twelve-month expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,086,721 1,062,771
Twelve-month expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,072,204 1,048,903
Twelve-month expected credit losses | Stages 1 and 2 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 215,693 209,606
Twelve-month expected credit losses | Stages 1 and 2 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 20,795 19,525
Twelve-month expected credit losses | Stages 1 and 2 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 83,553 83,656
Twelve-month expected credit losses | Stages 1 and 2 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51,314 41,552
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 629,774 624,137
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 273,949 276,377
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 85,357 86,954
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 23,146 22,954
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 19,553 19,883
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,537 164,874
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,934 1,860
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,726 3,570
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 8,139 7,609
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,740 2,677
Twelve-month expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 71,075 70,427
Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,806 2,567
Twelve-month expected credit losses | Stages 1 and 2 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 14,517 13,868
Lifetime expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total ECL allowances and provisions (456) (428)
Lifetime expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 29,454 26,546
Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 29,454 26,546
Lifetime expected credit losses | Stages 1 and 2 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 20 21
Lifetime expected credit losses | Stages 1 and 2 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 163 124
Lifetime expected credit losses | Stages 1 and 2 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stages 1 and 2 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 28,344 25,155
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 11,978 9,599
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 7,292 5,261
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,839 2,886
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,601 2,521
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 169
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 550 501
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 772 1,274
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 869 1,025
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 121 130
Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 926 1,247
Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 48 53
Lifetime expected credit losses | Stages 1 and 2 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stage 3    
Disclosure Of Credit Risk Exposure [Line Items]    
Total ECL allowances and provisions (1,864) (1,756)
Lifetime expected credit losses | Stage 3 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,482 4,167
Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,482 4,167
Lifetime expected credit losses | Stage 3 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stage 3 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5 0
Lifetime expected credit losses | Stage 3 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stage 3 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Stage 3 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,209 3,947
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,601 1,400
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 379 111
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 658 700
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 981 1,238
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 365 212
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51 47
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 5
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 69 119
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 86 92
Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 268 220
Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93 95
Lifetime expected credit losses | Stage 3 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI)    
Disclosure Of Credit Risk Exposure [Line Items]    
Total ECL allowances and provisions (280) (298)
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 576 841
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 576 841
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3 231
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 574 607
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 67 49
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 35 8
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3 213
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 416 163
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2 64
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 46 67
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 3
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Gross carrying amount | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 287,730 287,548
Gross carrying amount | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93,130 92,401
Gross carrying amount | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 27,312 27,514
Gross carrying amount | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 24,670 24,873
Gross carrying amount | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,962 165,384
Gross carrying amount | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,588 2,456
Gross carrying amount | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,592 4,943
Gross carrying amount | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,089 8,771
Gross carrying amount | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,139 3,102
Gross carrying amount | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,982 2,750
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 273,990 276,421
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 85,384 86,979
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 23,249 23,069
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 19,645 19,964
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,542 164,880
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,941 1,867
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4,736 3,584
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 8,146 7,618
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,769 2,696
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,809 2,571
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 12,002 9,617
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 7,318 5,292
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,940 2,980
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,687 2,602
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 169
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 564 513
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 772 1,274
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 874 1,033
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 146 154
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 49 54
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,671 1,455
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 393 122
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,004 1,113
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,868 2,109
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 412 239
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 83 76
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 84 86
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 69 119
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 183 184
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 124 125
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 67 55
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 36 8
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 119 352
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 470 198
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 7 95
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 42 68
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (2,746) (2,711)
Allowance for expected credit loss | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (2,746) (2,711)
Allowance for expected credit loss | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (90) (81)
Allowance for expected credit loss | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (3) (14)
Allowance for expected credit loss | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1) (1)
Allowance for expected credit loss | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (2,510) (2,490)
Allowance for expected credit loss | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (135) (124)
Allowance for expected credit loss | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (67) (67)
Allowance for expected credit loss | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (666) (762)
Allowance for expected credit loss | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1,119) (1,068)
Allowance for expected credit loss | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (57) (64)
Allowance for expected credit loss | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (53) (48)
Allowance for expected credit loss | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (101) (94)
Allowance for expected credit loss | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (11) (17)
Allowance for expected credit loss | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (146) (136)
Allowance for expected credit loss | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (141) (124)
Allowance for expected credit loss | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (35) (34)
Allowance for expected credit loss | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (397) (392)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (397) (392)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 (9)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1) (1)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (364) (353)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (41) (44)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (26) (26)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (103) (116)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (92) (80)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (5) (6)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (7) (7)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (9) (8)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (7) (9)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (29) (19)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (31) (29)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (4) (3)
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (333) (314)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (333) (314)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (29) (29)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (3) (5)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (286) (271)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (23) (18)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (26) (30)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (101) (94)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (86) (81)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (13) (12)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (4) (8)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (25) (24)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (15) (9)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1) (1)
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1,739) (1,715)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1,739) (1,715)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1,648) (1,629)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (70) (55)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (14) (11)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (346) (413)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (886) (872)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (47) (27)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (33) (29)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (88) (80)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (97) (92)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (91) (86)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (31) (30)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total on-balance sheet financial assets in scope of ECL requirements    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (277) (289)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (277) (289)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Cash and balances at central banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (61) (52)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Amounts due from banks    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Receivables from securities financing transactions measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Cash collateral receivables on derivative instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (212) (237)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1) (6)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (1) 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (116) (139)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (54) (36)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (5) (31)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (4) (6)
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | of which: Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 4 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Other financial assets measured at amortized cost    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets (3) 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Financial assets measured at fair value through other comprehensive income    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0