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Expected credit loss measurement - Financial assets subject to credit risk by rating category (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets $ 746,638 $ 695,603
Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 737,794 687,345
Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,480 15,444
Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,012 74,210
Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 397,761 379,528
Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26,209 27,194
Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 8,844 8,258
Twelve-month expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 728,923 672,021
Twelve-month expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 720,079 663,763
Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,453 15,260
Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,012 74,210
Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 380,564 356,948
Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 25,718 26,377
Lifetime expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,948 20,873
Lifetime expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,948 20,873
Lifetime expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26 184
Lifetime expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,620 20,341
Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 302 348
Lifetime expected credit losses | Credit-impaired positions | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,767 2,709
Lifetime expected credit losses | Credit-impaired positions | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,767 2,709
Lifetime expected credit losses | Credit-impaired positions | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 0
Lifetime expected credit losses | Credit-impaired positions | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Credit-impaired positions | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,577 2,240
Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 189 469
Gross carrying amount | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 747,606 696,815
Gross carrying amount | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 738,762 688,556
Gross carrying amount | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
Gross carrying amount | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,488 15,460
Gross carrying amount | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,014 74,212
Gross carrying amount | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
Gross carrying amount | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 398,611 380,589
Gross carrying amount | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26,318 27,327
Gross carrying amount | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 8,844 8,258
Gross carrying amount | Rating category 0-1 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 255,130 212,417
Gross carrying amount | Rating category 0-1 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 251,133 209,204
Gross carrying amount | Rating category 0-1 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 191,015 156,250
Gross carrying amount | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 407 543
Gross carrying amount | Rating category 0-1 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 34,386 22,998
Gross carrying amount | Rating category 0-1 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,466 8,196
Gross carrying amount | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,295 5,813
Gross carrying amount | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,564 15,404
Gross carrying amount | Rating category 0-1 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,996 3,212
Gross carrying amount | Rating category 2-3 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 282,874 266,936
Gross carrying amount | Rating category 2-3 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 278,103 261,922
Gross carrying amount | Rating category 2-3 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,802 1,981
Gross carrying amount | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,623 12,129
Gross carrying amount | Rating category 2-3 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 11,267 16,009
Gross carrying amount | Rating category 2-3 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13,476 13,477
Gross carrying amount | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 232,233 214,307
Gross carrying amount | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,702 4,018
Gross carrying amount | Rating category 2-3 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 4,771 5,014
Gross carrying amount | Rating category 4-5 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 85,472 91,993
Gross carrying amount | Rating category 4-5 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 85,472 91,993
Gross carrying amount | Rating category 4-5 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,171 1,344
Gross carrying amount | Rating category 4-5 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10,483 15,367
Gross carrying amount | Rating category 4-5 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,878 7,733
Gross carrying amount | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 67,620 67,270
Gross carrying amount | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 321 280
Gross carrying amount | Rating category 4-5 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category 6-8 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 97,923 98,255
Gross carrying amount | Rating category 6-8 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 97,846 98,223
Gross carrying amount | Rating category 6-8 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 795 1,182
Gross carrying amount | Rating category 6-8 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 17,440 17,995
Gross carrying amount | Rating category 6-8 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,647 3,243
Gross carrying amount | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 69,892 69,217
Gross carrying amount | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,072 6,585
Gross carrying amount | Rating category 6-8 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 77 32
Gross carrying amount | Rating category 9-13 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 23,793 23,709
Gross carrying amount | Rating category 9-13 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 23,793 23,709
Gross carrying amount | Rating category 9-13 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 490 260
Gross carrying amount | Rating category 9-13 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,439 1,842
Gross carrying amount | Rating category 9-13 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 47 88
Gross carrying amount | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 21,423 21,038
Gross carrying amount | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 394 481
Gross carrying amount | Rating category 9-13 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category Defaulted | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,414 3,505
Gross carrying amount | Rating category Defaulted | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,414 3,505
Gross carrying amount | Rating category Defaulted | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
Gross carrying amount | Rating category Defaulted | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category Defaulted | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
Gross carrying amount | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
Gross carrying amount | Rating category Defaulted | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,460 15,269
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,014 74,212
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 380,690 357,090
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 25,745 26,410
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 191,015 156,250
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 407 543
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 34,386 22,998
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,466 8,196
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,295 5,813
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,564 15,404
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,802 1,981
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,623 12,074
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 11,267 16,009
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13,476 13,477
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 231,153 212,970
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,693 4,015
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,146 1,277
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10,483 15,367
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,878 7,733
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 65,084 63,000
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 307 269
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 795 1,145
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 17,440 17,995
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,647 3,243
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 62,796 59,447
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,863 6,334
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 488 231
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,439 1,842
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 47 88
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 16,362 15,860
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 317 389
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 27 189
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,773 20,556
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 309 357
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 55
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,080 1,338
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10 3
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 24 67
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,536 4,269
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13 11
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 37
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,096 9,770
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 209 251
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2 29
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,061 5,178
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 77 91
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
Allowance for expected credit loss | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (969) (1,211)
Allowance for expected credit loss | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (969) (1,211)
Allowance for expected credit loss | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (8) (16)
Allowance for expected credit loss | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (2) (2)
Allowance for expected credit loss | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (850) (1,060)
Allowance for expected credit loss | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (109) (133)
Allowance for expected credit loss | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (161) (187)
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (161) (187)
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (7) (9)
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (2) (2)
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (126) (142)
Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (27) (34)
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (160) (229)
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (160) (229)
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (1) (5)
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (152) (215)
Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (7) (9)
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (647) (795)
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (647) (795)
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 (1)
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (572) (703)
Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (76) (90)
UBS AG | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 747,477 696,976
UBS AG | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 738,632 688,717
UBS AG | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
UBS AG | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,360 15,344
UBS AG | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,012 74,210
UBS AG | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
UBS AG | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 398,693 380,977
UBS AG | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26,236 27,219
UBS AG | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 8,844 8,258
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 729,762 673,394
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 720,917 665,135
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,333 15,160
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,012 74,210
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 381,496 358,396
UBS AG | Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 25,746 26,401
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,948 20,873
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,948 20,873
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26 184
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,620 20,341
UBS AG | Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 302 348
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,767 2,709
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,767 2,709
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 0
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,577 2,240
UBS AG | Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 189 469
UBS AG | Gross carrying amount | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 748,445 698,187
UBS AG | Gross carrying amount | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 739,601 689,929
UBS AG | Gross carrying amount | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
UBS AG | Gross carrying amount | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,368 15,360
UBS AG | Gross carrying amount | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,014 74,212
UBS AG | Gross carrying amount | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
UBS AG | Gross carrying amount | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 399,543 382,036
UBS AG | Gross carrying amount | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 26,346 27,352
UBS AG | Gross carrying amount | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 8,844 8,258
UBS AG | Gross carrying amount | Rating category 0-1 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 255,130 212,417
UBS AG | Gross carrying amount | Rating category 0-1 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 251,133 209,204
UBS AG | Gross carrying amount | Rating category 0-1 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 191,015 156,250
UBS AG | Gross carrying amount | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 407 543
UBS AG | Gross carrying amount | Rating category 0-1 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 34,386 22,998
UBS AG | Gross carrying amount | Rating category 0-1 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,466 8,196
UBS AG | Gross carrying amount | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,295 5,813
UBS AG | Gross carrying amount | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,564 15,404
UBS AG | Gross carrying amount | Rating category 0-1 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,996 3,212
UBS AG | Gross carrying amount | Rating category 2-3 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 283,236 268,309
UBS AG | Gross carrying amount | Rating category 2-3 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 278,465 263,295
UBS AG | Gross carrying amount | Rating category 2-3 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,802 1,981
UBS AG | Gross carrying amount | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,552 12,029
UBS AG | Gross carrying amount | Rating category 2-3 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 11,267 16,009
UBS AG | Gross carrying amount | Rating category 2-3 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13,476 13,477
UBS AG | Gross carrying amount | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 232,663 215,755
UBS AG | Gross carrying amount | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,705 4,043
UBS AG | Gross carrying amount | Rating category 2-3 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 4,771 5,014
UBS AG | Gross carrying amount | Rating category 4-5 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 85,424 91,993
UBS AG | Gross carrying amount | Rating category 4-5 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 85,424 91,993
UBS AG | Gross carrying amount | Rating category 4-5 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,123 1,344
UBS AG | Gross carrying amount | Rating category 4-5 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10,483 15,367
UBS AG | Gross carrying amount | Rating category 4-5 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,878 7,733
UBS AG | Gross carrying amount | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 67,620 67,270
UBS AG | Gross carrying amount | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 321 280
UBS AG | Gross carrying amount | Rating category 4-5 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category 6-8 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 98,449 98,255
UBS AG | Gross carrying amount | Rating category 6-8 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 98,372 98,223
UBS AG | Gross carrying amount | Rating category 6-8 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 795 1,182
UBS AG | Gross carrying amount | Rating category 6-8 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 17,440 17,995
UBS AG | Gross carrying amount | Rating category 6-8 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,647 3,243
UBS AG | Gross carrying amount | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 70,394 69,217
UBS AG | Gross carrying amount | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,097 6,585
UBS AG | Gross carrying amount | Rating category 6-8 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 77 32
UBS AG | Gross carrying amount | Rating category 9-13 | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 23,793 23,709
UBS AG | Gross carrying amount | Rating category 9-13 | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 23,793 23,709
UBS AG | Gross carrying amount | Rating category 9-13 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 490 260
UBS AG | Gross carrying amount | Rating category 9-13 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,439 1,842
UBS AG | Gross carrying amount | Rating category 9-13 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 47 88
UBS AG | Gross carrying amount | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 21,423 21,038
UBS AG | Gross carrying amount | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 394 481
UBS AG | Gross carrying amount | Rating category 9-13 | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category Defaulted | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,414 3,505
UBS AG | Gross carrying amount | Rating category Defaulted | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,414 3,505
UBS AG | Gross carrying amount | Rating category Defaulted | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
UBS AG | Gross carrying amount | Rating category Defaulted | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category Defaulted | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
UBS AG | Gross carrying amount | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
UBS AG | Gross carrying amount | Rating category Defaulted | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 192,817 158,231
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,340 15,170
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 75,014 74,212
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 30,514 32,737
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 381,622 358,538
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 25,772 26,435
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 191,015 156,250
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 407 543
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 34,386 22,998
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,466 8,196
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,295 5,813
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,564 15,404
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,802 1,981
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 12,552 11,974
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 11,267 16,009
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13,476 13,477
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 231,583 214,418
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 6,696 4,040
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,098 1,277
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10,483 15,367
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,878 7,733
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 65,083 63,000
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 307 269
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 795 1,145
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 17,440 17,995
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 3,647 3,243
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 63,298 59,447
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,887 6,334
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 488 231
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,439 1,842
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 47 88
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 16,362 15,860
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 317 389
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Twelve-month expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 27 189
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 15,773 20,556
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 309 357
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 55
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1,080 1,338
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 10 3
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 24 67
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,536 4,269
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 13 11
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 37
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 7,096 9,770
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 209 251
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2 29
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 5,061 5,178
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 77 91
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Positions that are not credit impaired | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 0-1 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 2-3 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 4-5 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 6-8 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category 9-13 | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 1 1
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 2,148 2,943
UBS AG | Gross carrying amount | Lifetime expected credit losses | Credit-impaired positions | Rating category Defaulted | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 264 560
UBS AG | Allowance for expected credit loss | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (969) (1,211)
UBS AG | Allowance for expected credit loss | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (969) (1,211)
UBS AG | Allowance for expected credit loss | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (8) (16)
UBS AG | Allowance for expected credit loss | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (2) (2)
UBS AG | Allowance for expected credit loss | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (850) (1,060)
UBS AG | Allowance for expected credit loss | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (109) (133)
UBS AG | Allowance for expected credit loss | Financial assets measured at FVOCI - debt instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (161) (187)
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (161) (187)
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (7) (9)
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (2) (2)
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (126) (142)
UBS AG | Allowance for expected credit loss | Twelve-month expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (27) (34)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (160) (229)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (160) (229)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (1) (5)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (152) (215)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Positions that are not credit impaired | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (7) (9)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Total on balance sheet financial instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (647) (795)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Total financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (647) (795)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Cash and balances at central banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to banks    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 (1)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Receivables from securities financing transactions    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Cash collateral receivables on derivative instruments    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets 0 0
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Loans and advances to customers    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets (572) (703)
UBS AG | Allowance for expected credit loss | Lifetime expected credit losses | Credit-impaired positions | Other financial assets measured at amortized cost    
Disclosure Of Internal Credit Exposures [Table]    
Financial assets $ (76) $ (90)