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FVM - Financial instruments not measured at fair value - Liabilities (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Carrying amount    
Amounts due to banks $ 13,101,000,000 $ 11,050,000,000
Payables from securities financing transactions 5,533,000,000 6,321,000,000
Cash collateral payables on derivative instruments 31,798,000,000 37,312,000,000
Customer deposits 542,007,000,000 524,605,000,000
Debt issued measured at amortized cost 139,155,000,000 139,232,000,000
Other financial liabilities measured at amortized cost 9,001,000,000 9,729,000,000
Fair Value    
Financial liabilities measured at fair value 300,916,000,000 325,069,000,000
Level 1    
Fair Value    
Financial liabilities measured at fair value 25,922,000,000 27,635,000,000
Level 2    
Fair Value    
Financial liabilities measured at fair value 257,637,000,000 282,222,000,000
Level 3    
Fair Value    
Financial liabilities measured at fair value 17,357,000,000 15,212,000,000
Not measured at fair value    
Carrying amount    
Amounts due to banks 13,100,000,000 11,000,000,000.0
Payables from securities financing transactions 5,500,000,000 6,300,000,000
Cash collateral payables on derivative instruments 31,800,000,000 37,300,000,000
Customer deposits 542,000,000,000.0 524,600,000,000
Debt issued measured at amortized cost 139,200,000,000 139,200,000,000
Other financial liabilities measured at amortized cost 5,400,000,000 5,800,000,000
Not measured at fair value | Amount due to banks    
Fair Value    
Financial liabilities measured at fair value 13,100,000,000 11,000,000,000.0
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 1,000,000,000 0
Not measured at fair value | Amount due to banks | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 9,100,000,000 8,500,000,000
Not measured at fair value | Amount due to banks | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Amount due to banks | Level 2    
Fair Value    
Financial liabilities measured at fair value 4,000,000,000.0 2,600,000,000
Not measured at fair value | Amount due to banks | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Payables from securities financing transactions    
Fair Value    
Financial liabilities measured at fair value 5,500,000,000 6,300,000,000
Not measured at fair value | Payables from securities financing transactions | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 4,100,000,000 6,000,000,000.0
Not measured at fair value | Payables from securities financing transactions | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Payables from securities financing transactions | Level 2    
Fair Value    
Financial liabilities measured at fair value 1,500,000,000 300,000,000
Not measured at fair value | Payables from securities financing transactions | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Cash collateral payables on derivative instruments    
Fair Value    
Financial liabilities measured at fair value 31,800,000,000 37,300,000,000
Not measured at fair value | Cash collateral payables on derivative instruments | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 31,800,000,000 37,300,000,000
Not measured at fair value | Cash collateral payables on derivative instruments | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Cash collateral payables on derivative instruments | Level 2    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Cash collateral payables on derivative instruments | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Customer deposits    
Fair Value    
Financial liabilities measured at fair value 542,000,000,000.0 524,700,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 3,000,000,000 2,000,000,000
Not measured at fair value | Customer deposits | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 535,400,000,000 519,400,000,000
Not measured at fair value | Customer deposits | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Customer deposits | Level 2    
Fair Value    
Financial liabilities measured at fair value 6,600,000,000 5,300,000,000
Not measured at fair value | Customer deposits | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Debt issued measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value 141,100,000,000 141,900,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 84,000,000,000 82,000,000,000
Not measured at fair value | Debt issued measured at amortized cost | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 15,800,000,000 16,400,000,000
Not measured at fair value | Debt issued measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Debt issued measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 125,300,000,000 125,500,000,000
Not measured at fair value | Debt issued measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Other financial liabilities measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value 5,400,000,000 5,800,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 3,000,000,000 3,000,000,000
Not measured at fair value | Other financial liabilities measured at amortized cost | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 5,400,000,000 5,700,000,000
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 100,000,000
UBS AG    
Carrying amount    
Amounts due to banks 13,101,000,000 11,050,000,000
Payables from securities financing transactions 5,533,000,000 6,321,000,000
Cash collateral payables on derivative instruments 31,801,000,000 37,313,000,000
Customer deposits 544,834,000,000 527,929,000,000
Funding from UBS Group AG 57,295,000,000 53,979,000,000
Debt issued measured at amortized cost 82,432,000,000 85,351,000,000
Other financial liabilities measured at amortized cost 9,765,000,000 10,421,000,000
Fair Value    
Financial liabilities measured at fair value 300,916,000,000 325,080,000,000
UBS AG | Level 1    
Fair Value    
Financial liabilities measured at fair value 25,922,000,000 27,635,000,000
UBS AG | Level 2    
Fair Value    
Financial liabilities measured at fair value 257,637,000,000 282,233,000,000
UBS AG | Level 3    
Fair Value    
Financial liabilities measured at fair value 17,357,000,000 15,212,000,000
UBS AG | Not measured at fair value    
Carrying amount    
Amounts due to banks 13,100,000,000 11,000,000,000.0
Payables from securities financing transactions 5,500,000,000 6,300,000,000
Cash collateral payables on derivative instruments 31,800,000,000 37,300,000,000
Customer deposits 544,800,000,000 527,900,000,000
Funding from UBS Group AG 57,300,000,000 54,000,000,000.0
Debt issued measured at amortized cost 82,400,000,000 85,400,000,000
Other financial liabilities measured at amortized cost 6,300,000,000 6,600,000,000
UBS AG | Not measured at fair value | Amount due to banks    
Fair Value    
Financial liabilities measured at fair value 13,100,000,000 11,100,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 1,000,000,000 0
UBS AG | Not measured at fair value | Amount due to banks | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 9,100,000,000 8,500,000,000
UBS AG | Not measured at fair value | Amount due to banks | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Amount due to banks | Level 2    
Fair Value    
Financial liabilities measured at fair value 4,000,000,000.0 2,600,000,000
UBS AG | Not measured at fair value | Amount due to banks | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Payables from securities financing transactions    
Fair Value    
Financial liabilities measured at fair value 5,500,000,000 6,300,000,000
UBS AG | Not measured at fair value | Payables from securities financing transactions | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 4,100,000,000 6,000,000,000.0
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 2    
Fair Value    
Financial liabilities measured at fair value 1,500,000,000 200,000,000
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments    
Fair Value    
Financial liabilities measured at fair value 31,800,000,000 37,300,000,000
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 31,800,000,000 37,300,000,000
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments | Level 2    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Customer deposits    
Fair Value    
Financial liabilities measured at fair value 544,800,000,000 528,000,000,000.0
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 4,000,000,000 3,000,000,000
UBS AG | Not measured at fair value | Customer deposits | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 537,600,000,000 521,800,000,000
UBS AG | Not measured at fair value | Customer deposits | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Customer deposits | Level 2    
Fair Value    
Financial liabilities measured at fair value 7,300,000,000 6,200,000,000
UBS AG | Not measured at fair value | Customer deposits | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Funding from UBS Group AG and its subsidiaries    
Fair Value    
Financial liabilities measured at fair value 58,800,000,000 55,600,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 53,000,000,000 49,000,000,000
UBS AG | Not measured at fair value | Funding from UBS Group AG and its subsidiaries | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 2,800,000,000 0.0
UBS AG | Not measured at fair value | Funding from UBS Group AG and its subsidiaries | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Funding from UBS Group AG and its subsidiaries | Level 2    
Fair Value    
Financial liabilities measured at fair value 56,000,000,000.0 55,600,000,000
UBS AG | Not measured at fair value | Funding from UBS Group AG and its subsidiaries | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Debt issued measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value 82,800,000,000 86,300,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 31,000,000,000 31,000,000,000
UBS AG | Not measured at fair value | Debt issued measured at amortized cost | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 13,000,000,000.0 16,400,000,000
UBS AG | Not measured at fair value | Debt issued measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Debt issued measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 69,800,000,000 70,000,000,000.0
UBS AG | Not measured at fair value | Debt issued measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value 6,300,000,000 6,700,000,000
Financial liabilities not measured at fair value expected to be recovered or settled after 12 months 3,000,000,000 3,000,000,000
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value 6,300,000,000 6,600,000,000
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 0.0 0.0
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value $ 0.0 $ 100,000,000