v3.26.1
Expected credit loss measurement - Coverage ratios (Detail 1) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 862,564 $ 916,166
ECL coverage 0.35% 0.31%
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
Loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 662,901 653,846
Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 287,595 287,424
Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93,064 92,334
Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 26,646 26,752
Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 23,551 23,805
Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,904 165,320
Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,535 2,408
Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,498 4,849
Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,077 8,753
Loans and advances to customers | 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
Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.11% 0.10%
Twelve-month expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 816,422 $ 874,662
ECL coverage 0.07% 0.06%
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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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
Lifetime expected credit losses | Stages 1 and 2    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 38,625 $ 34,346
ECL coverage 1.06% 1.12%
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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | Stage 3    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 6,712 $ 6,248
ECL coverage 26.87% 27.20%
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 | 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 | 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 | 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 | 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 | 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 | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 365 212
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51 47
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | 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 | 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 | 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 | Purchased credit-impaired (PCI)    
Disclosure Of Credit Risk Exposure [Line Items]    
Total on- and off-balance sheet $ 804 $ 910
ECL coverage 26.79% 27.03%
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) | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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
Gross carrying amount | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 668,402 659,086
Gross carrying amount | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 380,860 379,949
Gross carrying amount | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 51,982 52,387
Gross carrying amount | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 235,559 226,750
Gross carrying amount | Loans and advances to customers | 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 | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 93,130 92,401
Gross carrying amount | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 27,312 27,514
Gross carrying amount | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 24,670 24,873
Gross carrying amount | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 165,962 165,384
Gross carrying amount | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,588 2,456
Gross carrying amount | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,592 4,943
Gross carrying amount | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 9,089 8,771
Gross carrying amount | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,139 3,102
Gross carrying amount | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 46,207 39,344
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 632,947 627,051
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 359,374 363,401
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 42,894 43,033
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 230,679 220,618
Gross carrying amount | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 44,736 37,402
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 28,680 25,479
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 19,319 14,908
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,627 5,581
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 3,733 4,990
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,328 1,792
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 5,981 5,702
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,064 1,577
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 2,872 3,222
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 1,045 903
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 183 184
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 90 73
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) | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 794 853
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 103 64
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 589 550
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 102 239
Gross carrying amount | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets 53 77
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.38% 0.38%
Allowance for expected credit loss | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.05% 0.05%
Allowance for expected credit loss | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 3.43% 3.49%
Allowance for expected credit loss | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.24% 0.22%
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 | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (135) $ (124)
ECL coverage 0.05% 0.04%
Allowance for expected credit loss | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (67) $ (67)
ECL coverage 0.07% 0.07%
Allowance for expected credit loss | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (666) $ (762)
ECL coverage 2.44% 2.77%
Allowance for expected credit loss | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (1,119) $ (1,068)
ECL coverage 4.54% 4.29%
Allowance for expected credit loss | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (57) $ (64)
ECL coverage 0.03% 0.04%
Allowance for expected credit loss | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (53) $ (48)
ECL coverage 2.04% 1.97%
Allowance for expected credit loss | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (101) $ (94)
ECL coverage 1.80% 1.90%
Allowance for expected credit loss | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (11) $ (17)
ECL coverage 0.12% 0.20%
Allowance for expected credit loss | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (146) $ (136)
ECL coverage 4.64% 4.39%
Allowance for expected credit loss | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.34% 0.28%
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)
ECL coverage 1.18% 1.25%
Allowance for expected credit loss | Stages 1 and 2 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.10% 0.10%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.03% 0.03%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.79% 0.76%
Allowance for expected credit loss | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.07% 0.06%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.02% 0.02%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.06% 0.06%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.78% 0.80%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.80% 0.71%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.81% 0.80%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.17% 0.17%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.12% 0.20%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 1.83% 1.52%
Allowance for expected credit loss | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.11% 0.10%
Allowance for expected credit loss | Stages 1 and 2 | Loans to financial advisors    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.16% 0.15%
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.06% 0.06%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.02% 0.02%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.45% 0.46%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.05% 0.04%
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 | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (41) $ (44)
ECL coverage 0.01% 0.02%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (26) $ (26)
ECL coverage 0.03% 0.03%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (103) $ (116)
ECL coverage 0.44% 0.50%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (92) $ (80)
ECL coverage 0.47% 0.40%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (5) $ (6)
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (7) $ (7)
ECL coverage 0.37% 0.37%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (9) $ (8)
ECL coverage 0.20% 0.22%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (7) $ (9)
ECL coverage 0.08% 0.12%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (29) $ (19)
ECL coverage 1.03% 0.70%
Allowance for expected credit loss | Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.10% 0.10%
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)
ECL coverage 0.13% 0.12%
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 1.00% 1.07%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.25% 0.32%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 3.33% 3.13%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 1.36% 0.97%
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 | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (23) $ (18)
ECL coverage 0.19% 0.19%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (26) $ (30)
ECL coverage 0.35% 0.57%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (101) $ (94)
ECL coverage 3.45% 3.15%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (86) $ (81)
ECL coverage 3.20% 3.10%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (13) $ (12)
ECL coverage 2.33% 2.34%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0
ECL coverage 0.02% 0.02%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (4) $ (8)
ECL coverage 0.50% 0.77%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (25) $ (24)
ECL coverage 16.96% 15.90%
Allowance for expected credit loss | Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 0.56% 0.17%
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)
ECL coverage 1.95% 1.41%
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 | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 28.07% 29.11%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 4.04% 4.18%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 42.92% 39.86%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 34.70% 34.25%
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 | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (70) $ (55)
ECL coverage 4.17% 3.80%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (14) $ (11)
ECL coverage 3.51% 8.71%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (346) $ (413)
ECL coverage 34.49% 37.11%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (886) $ (872)
ECL coverage 47.46% 41.32%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (47) $ (27)
ECL coverage 11.37% 11.40%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (33) $ (29)
ECL coverage 39.05% 38.67%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (88) $ (80)
ECL coverage 0.00% 93.79%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (97) $ (92)
ECL coverage 52.95% 50.12%
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 76.36% 67.79%
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)
ECL coverage 24.65% 24.31%
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) | Total    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 26.69% 27.82%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total real estate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 1.42% 10.79%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total corporate lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 28.91% 31.77%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total | Total other lending    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 39.47% 23.28%
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 | Private clients with mortgages    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (1) $ (6)
ECL coverage 0.87% 11.62%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Real estate financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (1) $ 0
ECL coverage 2.43% 5.40%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Large corporate clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (116) $ (139)
ECL coverage 97.50% 39.56%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | SME clients    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (54) $ (36)
ECL coverage 11.57% 17.93%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Lombard    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (5) $ (31)
ECL coverage 69.72% 32.46%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Credit cards    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Commodity trade finance    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ (4) $ (6)
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Ship / aircraft financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 0 $ 0
ECL coverage 0.00% 0.00%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Consumer financing    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 4 $ 0
ECL coverage 0.00% 0.58%
Allowance for expected credit loss | Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers | Other loans and advances to customers    
Disclosure Of Credit Risk Exposure [Line Items]    
ECL coverage 67.10% 24.84%
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
ECL coverage 0.00% 0.00%