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Interests in subsidiaries (Detail 2)
€ in Millions, ¥ in Millions, £ in Millions, SFr in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions
 12 Months Ended
Dec. 31, 2020
AUD ($)
Dec. 31, 2020
CHF (SFr)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
HKD ($)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2020
SDG ( )
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Share capital               $ 338.0 $ 338.0
UBS Asset Management (Americas) Inc.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (Americas) Inc.                
Registered office Wilmington, Delaware, USA                
Primary business division Asset Management                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS Asset Management (Hong Kong) Limited                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (Hong Kong) Limited                
Registered office Hong Kong, Hong Kong                
Primary business division Asset Management                
Share capital         $ 254.0        
Equity interest accumulated in % 100.00%                
UBS Asset Management Life Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management Life Ltd                
Registered office London, United Kingdom                
Primary business division Asset Management                
Share capital | £       £ 15.0          
Equity interest accumulated in % 100.00%                
UBS Asset Management Switzerland AG                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management Switzerland AG                
Registered office Zurich, Switzerland                
Primary business division Asset Management                
Share capital | SFr   SFr 0.5              
Equity interest accumulated in % 100.00%                
UBS Asset Management (UK) Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (UK) Ltd                
Registered office London, United Kingdom                
Primary business division Asset Management                
Share capital | £       125.0          
Equity interest accumulated in % 100.00%                
UBS Business Solutions US LLC                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Business Solutions US LLC                
Registered office Wilmington, Delaware, USA                
Primary business division Group Functions                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS Credit Corp.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Credit Corp.                
Registered office Wilmington, Delaware, USA                
Primary business division Global Wealth Management                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS (France) SA.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS (France) S.A.                
Registered office Paris, France                
Primary business division Global Wealth Management                
Share capital | €     € 133.0            
Equity interest accumulated in % 100.00%                
UBS Fund Management (Luxembourg) S.A.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Fund Management (Luxembourg) S.A.                
Registered office Luxembourg, Luxembourg                
Primary business division Asset Management                
Share capital | €     13.0            
Equity interest accumulated in % 100.00%                
UBS Fund Management (Switzerland) AG                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Fund Management (Switzerland) AG                
Registered office Basel, Switzerland                
Primary business division Asset Management                
Share capital | SFr   1.0              
Equity interest accumulated in % 100.00%                
UBS (Monaco) S.A.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS (Monaco) S.A.                
Registered office Monte Carlo, Monaco                
Primary business division Global Wealth Management                
Share capital | €     49.2            
Equity interest accumulated in % 100.00%                
UBS Realty Investors LLC                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Realty Investors LLC                
Registered office Boston, Massachusetts, USA                
Primary business division Asset Management                
Share capital               9.0  
Equity interest accumulated in % 100.00%                
UBS Securities Australia Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Australia Ltd                
Registered office Sydney, Australia                
Primary business division Investment Bank                
Share capital [1] $ 0.3                
Equity interest accumulated in % 100.00%                
UBS Securities Hong Kong Limited                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Hong Kong Limited                
Registered office Hong Kong, Hong Kong                
Primary business division Investment Bank                
Share capital         3,154.2        
Equity interest accumulated in % 100.00%                
UBS Securities Japan Co., Ltd.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Japan Co., Ltd.                
Registered office Tokyo, Japan                
Primary business division Investment Bank                
Share capital | ¥           ¥ 32,100.0      
Equity interest accumulated in % 100.00%                
UBS Securities Pte. Ltd.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Pte. Ltd.                
Registered office Singapore, Singapore                
Primary business division Investment Bank                
Share capital |             420.4    
Equity interest accumulated in % 100.00%                
UBS AG                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Share capital               338.0 $ 338.0
UBS AG | UBS Asset Management (Americas) Inc.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (Americas) Inc.                
Registered office Wilmington, Delaware, USA                
Primary business division Asset Management                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS AG | UBS Asset Management (Hong Kong) Limited                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (Hong Kong) Limited                
Registered office Hong Kong, Hong Kong                
Primary business division Asset Management                
Share capital         254.0        
Equity interest accumulated in % 100.00%                
UBS AG | UBS Asset Management Life Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management Life Ltd                
Registered office London, United Kingdom                
Primary business division Asset Management                
Share capital | £       15.0          
Equity interest accumulated in % 100.00%                
UBS AG | UBS Asset Management Switzerland AG                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management Switzerland AG                
Registered office Zurich, Switzerland                
Primary business division Asset Management                
Share capital | SFr   0.5              
Equity interest accumulated in % 100.00%                
UBS AG | UBS Asset Management (UK) Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Asset Management (UK) Ltd                
Registered office London, United Kingdom                
Primary business division Asset Management                
Share capital | £       £ 125.0          
Equity interest accumulated in % 100.00%                
UBS AG | UBS Business Solutions US LLC                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Business Solutions US LLC                
Registered office Wilmington, Delaware, USA                
Primary business division Group Functions                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS AG | UBS Credit Corp.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Credit Corp.                
Registered office Wilmington, Delaware, USA                
Primary business division Global Wealth Management                
Share capital               0.0  
Equity interest accumulated in % 100.00%                
UBS AG | UBS (France) SA.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS (France) S.A.                
Registered office Paris, France                
Primary business division Global Wealth Management                
Share capital | €     133.0            
Equity interest accumulated in % 100.00%                
UBS AG | UBS Fund Management (Luxembourg) S.A.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Fund Management (Luxembourg) S.A.                
Registered office Luxembourg, Luxembourg                
Primary business division Asset Management                
Share capital | €     13.0            
Equity interest accumulated in % 100.00%                
UBS AG | UBS Fund Management (Switzerland) AG                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Fund Management (Switzerland) AG                
Registered office Basel, Switzerland                
Primary business division Asset Management                
Share capital | SFr   SFr 1.0              
Equity interest accumulated in % 100.00%                
UBS AG | UBS (Monaco) S.A.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS (Monaco) S.A.                
Registered office Monte Carlo, Monaco                
Primary business division Global Wealth Management                
Share capital | €     € 49.2            
Equity interest accumulated in % 100.00%                
UBS AG | UBS Realty Investors LLC                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Realty Investors LLC                
Registered office Boston, Massachusetts, USA                
Primary business division Asset Management                
Share capital               $ 9.0  
Equity interest accumulated in % 100.00%                
UBS AG | UBS Securities Australia Ltd                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Australia Ltd                
Registered office Sydney, Australia                
Primary business division Investment Bank                
Share capital [1] $ 0.3                
Equity interest accumulated in % 100.00%                
UBS AG | UBS Securities Hong Kong Limited                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Hong Kong Limited                
Registered office Hong Kong, Hong Kong                
Primary business division Investment Bank                
Share capital         $ 3,154.2        
Equity interest accumulated in % 100.00%                
UBS AG | UBS Securities Japan Co., Ltd.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Japan Co., Ltd.                
Registered office Tokyo, Japan                
Primary business division Investment Bank                
Share capital | ¥           ¥ 32,100.0      
Equity interest accumulated in % 100.00%                
UBS AG | UBS Securities Pte. Ltd.                  
Disclosure Of Investments In Subsidiaries With Material Group Contribution [Line Items]                  
Company UBS Securities Pte. Ltd.                
Registered office Singapore, Singapore                
Primary business division Investment Bank                
Share capital |             420.4    
Equity interest accumulated in % 100.00%                
[1]
Includes a nominal amount relating to redeemable preference shares.