v3.25.2
Expected credit loss measurement - On-balance sheet financial assets subject to ECL (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Disclosure Of Credit Risk Exposure [Line Items]      
Total ECL allowances and provisions $ (2,966) $ (2,629) $ (2,507)
Total on-balance sheet financial assets in scope of ECL requirements      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,138,490 1,057,134 1,045,488
Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,131,618 1,053,918 1,043,293
Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 236,193 231,370 223,329
Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 21,527 21,107 18,903
Receivables from securities financing transactions measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 110,161 101,784 118,301
Cash collateral receivables on derivative instruments      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 45,478 38,994 43,959
Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 646,048 594,150 579,967
Loans and advances to customers | of which: Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 285,106 257,254 249,756
Loans and advances to customers | of which: Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 92,450 83,414 82,602
Loans and advances to customers | of which: Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 26,647 25,097 25,286
Loans and advances to customers | of which: SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 24,689 21,787 20,768
Loans and advances to customers | of which: Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 161,022 152,821 147,504
Loans and advances to customers | of which: Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,315 2,025 1,978
Loans and advances to customers | of which: Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,273 4,330 4,203
Loans and advances to customers | of which: Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,708 8,029 7,848
Loans and advances to customers | of which: Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,973 2,629 2,820
Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 72,211 66,513 58,835
Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,682 2,738 2,723
Financial assets measured at fair value through other comprehensive income      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 6,872 3,216 2,195
Twelve-month expected credit losses | Stages 1 and 2      
Disclosure Of Credit Risk Exposure [Line Items]      
Total ECL allowances and provisions (579) (493) (487)
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 1,107,384 1,029,322 1,018,102
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 1,100,512 1,026,106 1,015,906
Twelve-month expected credit losses | Stages 1 and 2 | Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 236,007 231,207 223,201
Twelve-month expected credit losses | Stages 1 and 2 | Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 21,425 21,070 18,704
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 110,161 101,784 118,301
Twelve-month expected credit losses | Stages 1 and 2 | Cash collateral receivables on derivative instruments      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 45,478 38,994 43,959
Twelve-month expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 616,026 567,285 553,532
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 272,055 245,046 239,540
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 86,557 78,340 78,410
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 22,894 21,923 20,816
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 20,887 18,381 17,403
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 160,775 152,732 147,136
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 1,791 1,564 1,533
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 4,236 4,311 4,089
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 7,903 7,713 6,974
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 2,684 2,414 2,480
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 71,415 65,766 58,209
Twelve-month expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,495 2,600 2,568
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 6,872 3,216 2,195
Lifetime expected credit losses | Stages 1 and 2      
Disclosure Of Credit Risk Exposure [Line Items]      
Total ECL allowances and provisions (474) (455) (459)
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 26,229 23,085 22,697
Lifetime expected credit losses | Stages 1 and 2 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 26,229 23,085 22,697
Lifetime expected credit losses | Stages 1 and 2 | Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 20 18 13
Lifetime expected credit losses | Stages 1 and 2 | Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 102 37 198
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 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 0
Lifetime expected credit losses | Stages 1 and 2 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25,488 22,470 22,049
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 11,620 10,800 8,987
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 5,572 4,828 3,976
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 3,098 2,115 3,462
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 2,496 2,287 2,265
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 147 1 260
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 479 420 406
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 25 12 106
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 727 316 874
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 131 109 114
Lifetime expected credit losses | Stages 1 and 2 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 620 560 436
Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 97 48 59
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 0
Lifetime expected credit losses | Stage 3      
Disclosure Of Credit Risk Exposure [Line Items]      
Total ECL allowances and provisions (1,574) (1,357) (1,253)
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 4,032 3,758 3,743
Lifetime expected credit losses | Stage 3 | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,032 3,758 3,743
Lifetime expected credit losses | Stage 3 | Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 0 0
Lifetime expected credit losses | Stage 3 | Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 0 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 0
Lifetime expected credit losses | Stage 3 | Cash collateral receivables on derivative instruments      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 0 0
Lifetime expected credit losses | Stage 3 | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,861 3,582 3,565
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 1,391 1,309 1,146
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 313 228 195
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 418 740 707
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 1,210 996 952
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 47 32 48
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 45 41 39
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 12 7 8
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 78 0 0
Lifetime expected credit losses | Stage 3 | Loans and advances to customers | of which: Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 89 73 159
Lifetime expected credit losses | Stage 3 | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 171 176 178
Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 90 89 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 0
Lifetime expected credit losses | Purchased credit-impaired (PCI)      
Disclosure Of Credit Risk Exposure [Line Items]      
Total ECL allowances and provisions (338) (324) (309)
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 844 969 946
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 844 969 946
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 167 145 114
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 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 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 0
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 673 813 820
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 41 99 84
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 8 18 20
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 237 320 301
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 95 122 148
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 53 55 61
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 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 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 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 69 33 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 5 11 12
Lifetime expected credit losses | Purchased credit-impaired (PCI) | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 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 0
Gross carrying amount | Loans and advances to customers | of which: Private clients with mortgages      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 285,249 257,387 249,916
Gross carrying amount | Loans and advances to customers | of which: Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 92,519 83,476 82,660
Gross carrying amount | Loans and advances to customers | of which: Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 27,294 25,744 25,859
Gross carrying amount | Loans and advances to customers | of which: SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 25,706 22,598 21,510
Gross carrying amount | Loans and advances to customers | of which: Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 161,086 152,869 147,547
Gross carrying amount | Loans and advances to customers | of which: Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,363 2,069 2,019
Gross carrying amount | Loans and advances to customers | of which: Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 4,364 4,410 4,284
Gross carrying amount | Loans and advances to customers | of which: Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 8,728 8,048 7,879
Gross carrying amount | Loans and advances to customers | of which: Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 3,083 2,721 2,912
Gross carrying amount | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 2,721 2,778 2,764
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 272,098 245,085 239,586
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 86,582 78,366 78,434
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 23,011 22,004 20,888
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 20,961 18,446 17,459
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 160,787 152,740 147,141
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 1,798 1,572 1,539
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 4,244 4,319 4,098
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 7,917 7,729 6,988
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 2,703 2,430 2,495
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 2,498 2,603 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 11,669 10,850 9,056
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 5,608 4,860 4,003
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 3,194 2,225 3,585
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 2,581 2,354 2,312
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 147 1 260
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 491 431 416
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 25 12 106
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 732 319 891
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 154 128 133
Gross carrying amount | Lifetime expected credit losses | Stages 1 and 2 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 99 49 60
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 1,429 1,345 1,176
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 320 232 202
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 716 1,075 983
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 2,033 1,642 1,565
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 73 50 66
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 74 66 64
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 94 80 79
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 78 0 0
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 163 135 221
Gross carrying amount | Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 125 125 132
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 53 107 98
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 9 18 20
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 373 438 402
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 131 155 174
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 78 77 79
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 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 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 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 64 28 63
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 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 (2,559) (2,293) (2,187)
Allowance for expected credit loss | Total financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (2,559) (2,293) (2,187)
Allowance for expected credit loss | Cash and balances at central banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (72) (60) (47)
Allowance for expected credit loss | Amounts due from banks      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (10) (9) (36)
Allowance for expected credit loss | Receivables from securities financing transactions measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (3) (3) (2)
Allowance for expected credit loss | Cash collateral receivables on derivative instruments      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets 0 0 0
Allowance for expected credit loss | Loans and advances to customers      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (2,343) (2,099) (1,978)
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 (142) (133) (160)
Allowance for expected credit loss | Loans and advances to customers | of which: Real estate financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (69) (62) (58)
Allowance for expected credit loss | Loans and advances to customers | of which: Large corporate clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (647) (646) (573)
Allowance for expected credit loss | Loans and advances to customers | of which: SME clients      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (1,018) (811) (742)
Allowance for expected credit loss | Loans and advances to customers | of which: Lombard      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (64) (48) (42)
Allowance for expected credit loss | Loans and advances to customers | of which: Credit cards      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (48) (44) (41)
Allowance for expected credit loss | Loans and advances to customers | of which: Commodity trade finance      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (91) (81) (81)
Allowance for expected credit loss | Loans and advances to customers | of which: Ship / aircraft financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (20) (19) (31)
Allowance for expected credit loss | Loans and advances to customers | of which: Consumer financing      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (110) (92) (93)
Allowance for expected credit loss | Other financial assets measured at amortized cost      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (131) (121) (125)
Allowance for expected credit loss | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (39) (40) (41)
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 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 (378) (321) (304)
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 (378) (321) (304)
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 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 (5) (5) (1)
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 (3) (3) (2)
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 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 (343) (289) (276)
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 (43) (39) (46)
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 (25) (26) (24)
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 (116) (82) (72)
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 (74) (65) (55)
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 (11) (8) (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) (8) (6)
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 (8) (8) (9)
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 (15) (16) (14)
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 (19) (16) (15)
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 (25) (24) (25)
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 (3) (3) (4)
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 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 (356) (340) (357)
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 (356) (340) (357)
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) (28) (21)
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 (5) (4) (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 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 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 (311) (300) (323)
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 (49) (50) (70)
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 (36) (32) (27)
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 (97) (111) (123)
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 (85) (67) (47)
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 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 (12) (11) (11)
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 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 (5) (4) (16)
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 (23) (19) (19)
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 (11) (8) (7)
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) (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 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 (1,489) (1,309) (1,218)
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 (1,489) (1,309) (1,218)
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 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 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 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 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 (1,395) (1,228) (1,134)
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 (38) (36) (30)
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 (8) (4) (7)
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 (298) (335) (277)
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 (823) (646) (613)
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 (27) (18) (18)
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 (29) (26) (25)
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 (82) (73) (71)
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 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 (74) (62) (62)
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 (94) (82) (84)
Allowance for expected credit loss | Lifetime expected credit losses | Stage 3 | Loans to financial advisors      
Disclosure Of Credit Risk Exposure [Line Items]      
Financial assets (35) (36) (37)
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 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 (337) (322) (307)
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 (337) (322) (307)
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 (43) (33) (25)
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 (30)
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 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 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 (293) (281) (244)
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 (12) (8) (14)
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 0 0 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 (136) (119) (100)
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 (35) (33) (26)
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 (26) (22) (18)
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 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 0 0 0
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 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 5 5 4
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 (1) (8) (8)
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 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 $ 0