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FVM - Financial instruments not measured at fair value - Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying amount    
Amounts due to banks $ 11,050 $ 6,570
Payables from securities financing transactions 6,321 7,778
Cash collateral payables on derivative instruments 37,312 31,415
Customer deposits 524,605 448,284
Debt issued measured at amortized cost [1] 139,232 110,497
Other financial liabilities measured at amortized cost 9,729 9,712
Fair Value    
Financial liabilities measured at fair value [2] 325,069 291,452
Level 1    
Fair Value    
Financial liabilities measured at fair value [2] 27,635 26,176
Level 2    
Fair Value    
Financial liabilities measured at fair value [2] 282,222 252,518
Level 3    
Fair Value    
Financial liabilities measured at fair value [2] 15,212 12,759
Not measured at fair value    
Carrying amount    
Amounts due to banks 11,000 6,600
Payables from securities financing transactions 6,300 7,800
Cash collateral payables on derivative instruments 37,300 31,400
Customer deposits 524,600 448,300
Debt issued measured at amortized cost 139,200 110,500
Other financial liabilities measured at amortized cost [3] 5,800 5,800
Not measured at fair value | Amount due to banks    
Fair Value    
Financial liabilities measured at fair value 11,000 6,600
Not measured at fair value | Amount due to banks | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 8,500 5,600
Not measured at fair value | Amount due to banks | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Amount due to banks | Level 2    
Fair Value    
Financial liabilities measured at fair value 2,600 900
Not measured at fair value | Amount due to banks | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Payables from securities financing transactions    
Fair Value    
Financial liabilities measured at fair value 6,300 7,800
Not measured at fair value | Payables from securities financing transactions | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 6,000 7,500
Not measured at fair value | Payables from securities financing transactions | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Payables from securities financing transactions | Level 2    
Fair Value    
Financial liabilities measured at fair value 300 300
Not measured at fair value | Payables from securities financing transactions | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Cash collateral payables on derivative instruments    
Fair Value    
Financial liabilities measured at fair value 37,300 31,400
Not measured at fair value | Cash collateral payables on derivative instruments | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 37,300 31,400
Not measured at fair value | Cash collateral payables on derivative instruments | Level 1    
Fair Value    
Financial liabilities measured at fair value 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
Not measured at fair value | Cash collateral payables on derivative instruments | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Customer deposits    
Fair Value    
Financial liabilities measured at fair value 524,700 448,400
Not measured at fair value | Customer deposits | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 519,400 439,100
Not measured at fair value | Customer deposits | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Customer deposits | Level 2    
Fair Value    
Financial liabilities measured at fair value 5,300 9,300
Not measured at fair value | Customer deposits | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Debt issued measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value 141,900 113,600
Not measured at fair value | Debt issued measured at amortized cost | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 16,400 8,700
Not measured at fair value | Debt issued measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Debt issued measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 125,500 104,900
Not measured at fair value | Debt issued measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
Not measured at fair value | Other financial liabilities measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value [3] 5,800 5,700
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 [4] 5,700 5,700
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value [3] 0 0
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value [3] 0 0
Not measured at fair value | Other financial liabilities measured at amortized cost | Level 3    
Fair Value    
Financial liabilities measured at fair value [3] 100 0
UBS AG    
Carrying amount    
Amounts due to banks 11,050 6,570
Payables from securities financing transactions 6,321 7,778
Cash collateral payables on derivative instruments 37,313 31,416
Customer deposits 527,929 450,591
Funding from UBS Group AG and its subsidiaries [5],[6] 53,979 47,866
Debt issued measured at amortized cost [1] 85,351 62,835
Other financial liabilities measured at amortized cost 10,421 10,373
Fair Value    
Financial liabilities measured at fair value [2] 325,080 291,452
UBS AG | Level 1    
Fair Value    
Financial liabilities measured at fair value [2] 27,635 26,176
UBS AG | Level 2    
Fair Value    
Financial liabilities measured at fair value [2] 282,233 252,518
UBS AG | Level 3    
Fair Value    
Financial liabilities measured at fair value [2] 15,212 12,759
UBS AG | Not measured at fair value    
Carrying amount    
Amounts due to banks 11,000 6,600
Payables from securities financing transactions 6,300 7,800
Cash collateral payables on derivative instruments 37,300 31,400
Customer deposits 527,900 450,600
Funding from UBS Group AG and its subsidiaries 54,000 47,900
Debt issued measured at amortized cost 85,400 62,800
Other financial liabilities measured at amortized cost [3] 6,600 6,500
UBS AG | Not measured at fair value | Amount due to banks    
Fair Value    
Financial liabilities measured at fair value [4] 11,100 6,600
UBS AG | Not measured at fair value | Amount due to banks | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 8,500 5,600
UBS AG | Not measured at fair value | Amount due to banks | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
UBS AG | Not measured at fair value | Amount due to banks | Level 2    
Fair Value    
Financial liabilities measured at fair value 2,600 900
UBS AG | Not measured at fair value | Amount due to banks | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
UBS AG | Not measured at fair value | Payables from securities financing transactions    
Fair Value    
Financial liabilities measured at fair value [4] 6,300 7,800
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] 6,000 7,500
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 2    
Fair Value    
Financial liabilities measured at fair value 200 300
UBS AG | Not measured at fair value | Payables from securities financing transactions | Level 3    
Fair Value    
Financial liabilities measured at fair value 0 0
UBS AG | Not measured at fair value | Cash collateral payables on derivative instruments    
Fair Value    
Financial liabilities measured at fair value [4] 37,300 31,400
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 [4] 37,300 31,400
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
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
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
UBS AG | Not measured at fair value | Customer deposits    
Fair Value    
Financial liabilities measured at fair value [4] 528,000 450,700
UBS AG | Not measured at fair value | Customer deposits | Carrying amount approximates fair value    
Fair Value    
Financial liabilities measured at fair value [4] 521,800 440,500
UBS AG | Not measured at fair value | Customer deposits | Level 1    
Fair Value    
Financial liabilities measured at fair value 0 0
UBS AG | Not measured at fair value | Customer deposits | Level 2    
Fair Value    
Financial liabilities measured at fair value 6,200 10,200
UBS AG | Not measured at fair value | Customer deposits | Level 3    
Fair Value    
Financial liabilities measured at fair value 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 [4] 55,600 49,600
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 [4] 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
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 55,600 49,600
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
UBS AG | Not measured at fair value | Debt issued measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value [4] 86,300 64,300
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 [4] 16,400 8,700
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
UBS AG | Not measured at fair value | Debt issued measured at amortized cost | Level 2    
Fair Value    
Financial liabilities measured at fair value 70,000 55,500
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
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost    
Fair Value    
Financial liabilities measured at fair value [4] 6,700 6,500
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 [3],[4] 6,600 6,500
UBS AG | Not measured at fair value | Other financial liabilities measured at amortized cost | Level 1    
Fair Value    
Financial liabilities measured at fair value [3] 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 [3] 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 [3] $ 100 $ 0
[1]
Net of bifurcated embedded derivatives, the fair value of which was not material for the periods presented.
[2]
Bifurcated embedded derivatives are presented on the same balance sheet lines as their host contracts and are not included in this table. The fair value of these derivatives was not material for the periods presented
[3]
Excludes lease liabilities.
[4]
Includes certain financial instruments where the carrying amount is a reasonable approximation of the fair value due to the instruments’ short-term nature (instruments that are receivable or payable on demand, or with a remaining maturity (excluding the effects of callable features) of three months or less)
[5]
Represents funding from UBS Group AG to UBS AG.
[6]
UBS AG has also recognized funding from UBS Group AG and its subsidiaries that is designated at fair value. Refer to Note 19b for more information.