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Derivative instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Derivative [Table]    
Derivative financial assets $ 118,142 $ 159,617
Notional amounts related to derivative financial assets 4,613,800 4,479,500
Derivative financial liabilities 121,309 161,102
Notional amounts related to derivative financial liabilities 4,616,600 4,429,700
Other amounts values 8,771,100 11,394,400
Interest rate contracts    
Derivative [Table]    
Derivative financial assets 33,200 50,900
Notional amounts related to derivative financial assets 991,200 928,000
Derivative financial liabilities 28,700 43,900
Notional amounts related to derivative financial liabilities 943,100 880,400
Other amounts values 8,675,100 11,291,500
Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 1,400 2,400
Notional amounts related to derivative financial assets 44,700 57,600
Derivative financial liabilities 1,800 2,900
Notional amounts related to derivative financial liabilities 46,300 64,800
Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 53,300 68,700
Notional amounts related to derivative financial assets 3,030,800 2,951,100
Derivative financial liabilities 54,100 70,500
Notional amounts related to derivative financial liabilities 2,938,800 2,820,400
Other amounts values 1,200 1,400
Equity contracts    
Derivative [Table]    
Derivative financial assets 28,200 34,800
Notional amounts related to derivative financial assets 456,900 449,600
Derivative financial liabilities 34,900 41,200
Notional amounts related to derivative financial liabilities 603,900 581,300
Other amounts values 80,100 91,300
Commodity contracts    
Derivative [Table]    
Derivative financial assets 1,600 2,200
Notional amounts related to derivative financial assets 57,800 57,800
Derivative financial liabilities 1,600 2,000
Notional amounts related to derivative financial liabilities 56,400 49,700
Other amounts values 14,700 10,100
Loan commitments measured at FVTPL    
Derivative [Table]    
Notional amounts related to derivative financial assets 800  
Unsettled purchases of non-derivative financial instruments    
Derivative [Table]    
Derivative financial assets 100 300
Notional amounts related to derivative financial assets 13,300 18,300
Derivative financial liabilities 200 200
Notional amounts related to derivative financial liabilities 10,600 10,000
Unsettled sales of non-derivative financial instruments    
Derivative [Table]    
Derivative financial assets 200 200
Notional amounts related to derivative financial assets 18,200 17,200
Derivative financial liabilities 100 300
Notional amounts related to derivative financial liabilities 9,400 12,900
Over-the-counter (OTC) contracts | Loan commitments measured at FVTPL    
Derivative [Table]    
Derivative financial liabilities 0 0
Notional amounts related to derivative financial liabilities 8,200 10,200
Forward contracts | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 100 0
Notional amounts related to derivative financial assets 29,400 19,800
Derivative financial liabilities 200 400
Notional amounts related to derivative financial liabilities 28,600 21,900
Other amounts values 443,600 2,602,500
Forward contracts | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 23,800 27,300
Notional amounts related to derivative financial assets 1,008,900 779,100
Derivative financial liabilities 23,800 29,000
Notional amounts related to derivative financial liabilities 1,043,200 853,300
Forward contracts | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Notional amounts related to derivative financial assets 18,100 8,000
Notional amounts related to derivative financial liabilities 15,200 6,300
Swaps | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 26,400 40,800
Notional amounts related to derivative financial assets 394,300 407,000
Derivative financial liabilities 19,200 30,900
Notional amounts related to derivative financial liabilities 344,100 364,800
Other amounts values 7,549,400 8,105,200
Swaps | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 24,300 34,300
Notional amounts related to derivative financial assets 1,606,300 1,727,300
Derivative financial liabilities 24,900 34,400
Notional amounts related to derivative financial liabilities 1,480,300 1,567,300
Swaps | Over-the-counter (OTC) contracts | Equity contracts    
Derivative [Table]    
Derivative financial assets 4,700 6,400
Notional amounts related to derivative financial assets 105,700 89,400
Derivative financial liabilities 9,300 9,800
Notional amounts related to derivative financial liabilities 154,800 108,400
Swaps | Over-the-counter (OTC) contracts | Commodity contracts    
Derivative [Table]    
Derivative financial assets 500 500
Notional amounts related to derivative financial assets 19,900 17,700
Derivative financial liabilities 800 800
Notional amounts related to derivative financial liabilities 25,400 18,000
Options | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 6,600 10,100
Notional amounts related to derivative financial assets 545,200 447,500
Derivative financial liabilities 9,200 12,500
Notional amounts related to derivative financial liabilities 553,600 460,500
Options | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 5,200 7,100
Notional amounts related to derivative financial assets 412,600 440,900
Derivative financial liabilities 5,300 7,100
Notional amounts related to derivative financial liabilities 408,600 394,700
Options | Over-the-counter (OTC) contracts | Equity contracts    
Derivative [Table]    
Derivative financial assets 4,600 7,000
Notional amounts related to derivative financial assets 61,400 87,100
Derivative financial liabilities 6,500 10,900
Notional amounts related to derivative financial liabilities 102,300 146,200
Options | Over-the-counter (OTC) contracts | Commodity contracts    
Derivative [Table]    
Derivative financial assets 400 1,000
Notional amounts related to derivative financial assets 14,000 23,500
Derivative financial liabilities 200 700
Notional amounts related to derivative financial liabilities 10,400 17,800
Options | Exchange-traded derivatives (ETD) | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 0 0
Notional amounts related to derivative financial assets 22,400 53,600
Derivative financial liabilities 0 0
Notional amounts related to derivative financial liabilities 16,800 33,100
Other amounts values 157,100 103,300
Options | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Derivative financial assets 10,200 10,700
Notional amounts related to derivative financial assets 289,600 273,100
Derivative financial liabilities 9,800 11,300
Notional amounts related to derivative financial liabilities 346,300 326,800
Other amounts values 8,800 23,500
Futures | Exchange-traded derivatives (ETD) | Interest rate contracts    
Derivative [Table]    
Other amounts values 525,000 480,600
Futures | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Other amounts values 71,200 67,900
Futures | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Other amounts values 13,900 9,300
Client-cleared transactions | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Derivative financial assets 8,600 10,700
Derivative financial liabilities 9,400 9,100
Client-cleared transactions | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Derivative financial assets 600 500
Derivative financial liabilities 400 300
Credit default swaps | Over-the-counter (OTC) contracts | Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 1,300 2,200
Notional amounts related to derivative financial assets 39,400 53,600
Derivative financial liabilities 1,600 2,600
Notional amounts related to derivative financial liabilities 44,100 62,300
Total return swaps | Over-the-counter (OTC) contracts | Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 100 100
Notional amounts related to derivative financial assets 1,300 1,900
Derivative financial liabilities 200 300
Notional amounts related to derivative financial liabilities 1,700 2,500
UBS AG    
Derivative [Table]    
Derivative financial assets 118,145 159,618
Notional amounts related to derivative financial assets 4,614,000 4,479,600
Derivative financial liabilities 121,309 161,102
Notional amounts related to derivative financial liabilities 4,616,600 4,429,700
Other amounts values 8,771,100 11,394,400
UBS AG | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 33,200 50,900
Notional amounts related to derivative financial assets 991,200 928,000
Derivative financial liabilities 28,700 43,900
Notional amounts related to derivative financial liabilities 943,100 880,400
Other amounts values 8,675,100 11,291,500
UBS AG | Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 1,400 2,400
Notional amounts related to derivative financial assets 44,700 57,600
Derivative financial liabilities 1,800 2,900
Notional amounts related to derivative financial liabilities 46,300 64,800
UBS AG | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 53,300 68,700
Notional amounts related to derivative financial assets 3,031,000 2,951,200
Derivative financial liabilities 54,100 70,500
Notional amounts related to derivative financial liabilities 2,938,800 2,820,400
Other amounts values 1,200 1,400
UBS AG | Equity contracts    
Derivative [Table]    
Derivative financial assets 28,200 34,800
Notional amounts related to derivative financial assets 456,900 449,600
Derivative financial liabilities 34,900 41,200
Notional amounts related to derivative financial liabilities 603,900 581,300
Other amounts values 80,100 91,300
UBS AG | Commodity contracts    
Derivative [Table]    
Derivative financial assets 1,600 2,200
Notional amounts related to derivative financial assets 57,800 57,800
Derivative financial liabilities 1,600 2,000
Notional amounts related to derivative financial liabilities 56,400 49,700
Other amounts values 14,700 10,100
UBS AG | Loan commitments measured at FVTPL    
Derivative [Table]    
Notional amounts related to derivative financial assets 800  
UBS AG | Unsettled purchases of non-derivative financial instruments    
Derivative [Table]    
Derivative financial assets 100 300
Notional amounts related to derivative financial assets 13,300 18,300
Derivative financial liabilities 200 200
Notional amounts related to derivative financial liabilities 10,600 10,000
UBS AG | Unsettled sales of non-derivative financial instruments    
Derivative [Table]    
Derivative financial assets 200 200
Notional amounts related to derivative financial assets 18,200 17,200
Derivative financial liabilities 100 300
Notional amounts related to derivative financial liabilities 9,400 12,900
UBS AG | Over-the-counter (OTC) contracts | Loan commitments measured at FVTPL    
Derivative [Table]    
Derivative financial liabilities 0 0
Notional amounts related to derivative financial liabilities 8,200 10,200
UBS AG | Forward contracts | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 100 0
Notional amounts related to derivative financial assets 29,400 19,800
Derivative financial liabilities 200 400
Notional amounts related to derivative financial liabilities 28,600 21,900
Other amounts values 443,600 2,602,500
UBS AG | Forward contracts | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 23,800 27,300
Notional amounts related to derivative financial assets 1,009,100 779,200
Derivative financial liabilities 23,800 29,000
Notional amounts related to derivative financial liabilities 1,043,200 853,300
UBS AG | Forward contracts | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Derivative financial assets 0 0
Notional amounts related to derivative financial assets 18,100 8,000
Derivative financial liabilities 0 0
Notional amounts related to derivative financial liabilities 15,200 6,300
UBS AG | Swaps | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 26,400 40,800
Notional amounts related to derivative financial assets 394,300 407,000
Derivative financial liabilities 19,200 30,900
Notional amounts related to derivative financial liabilities 344,100 364,800
Other amounts values 7,549,400 8,105,200
UBS AG | Swaps | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 24,300 34,300
Notional amounts related to derivative financial assets 1,606,400 1,727,300
Derivative financial liabilities 24,900 34,400
Notional amounts related to derivative financial liabilities 1,480,300 1,567,300
UBS AG | Swaps | Over-the-counter (OTC) contracts | Equity contracts    
Derivative [Table]    
Derivative financial assets 4,700 6,400
Notional amounts related to derivative financial assets 105,700 89,400
Derivative financial liabilities 9,300 9,800
Notional amounts related to derivative financial liabilities 154,800 108,400
UBS AG | Swaps | Over-the-counter (OTC) contracts | Commodity contracts    
Derivative [Table]    
Derivative financial assets 500 500
Notional amounts related to derivative financial assets 19,900 17,700
Derivative financial liabilities 800 800
Notional amounts related to derivative financial liabilities 25,400 18,000
UBS AG | Options | Over-the-counter (OTC) contracts | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 6,600 10,100
Notional amounts related to derivative financial assets 545,200 447,500
Derivative financial liabilities 9,200 12,500
Notional amounts related to derivative financial liabilities 553,600 460,500
UBS AG | Options | Over-the-counter (OTC) contracts | Foreign exchange contracts    
Derivative [Table]    
Derivative financial assets 5,200 7,100
Notional amounts related to derivative financial assets 412,600 440,900
Derivative financial liabilities 5,300 7,100
Notional amounts related to derivative financial liabilities 408,600 394,700
UBS AG | Options | Over-the-counter (OTC) contracts | Equity contracts    
Derivative [Table]    
Derivative financial assets 4,600 7,000
Notional amounts related to derivative financial assets 61,400 87,100
Derivative financial liabilities 6,500 10,900
Notional amounts related to derivative financial liabilities 102,300 146,200
UBS AG | Options | Over-the-counter (OTC) contracts | Commodity contracts    
Derivative [Table]    
Derivative financial assets 400 1,000
Notional amounts related to derivative financial assets 14,000 23,500
Derivative financial liabilities 200 700
Notional amounts related to derivative financial liabilities 10,400 17,800
UBS AG | Options | Exchange-traded derivatives (ETD) | Interest rate contracts    
Derivative [Table]    
Derivative financial assets 0 0
Notional amounts related to derivative financial assets 22,400 53,600
Derivative financial liabilities 0 0
Notional amounts related to derivative financial liabilities 16,800 33,100
Other amounts values 157,100 103,300
UBS AG | Options | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Derivative financial assets 10,200 10,700
Notional amounts related to derivative financial assets 289,600 273,100
Derivative financial liabilities 9,800 11,300
Notional amounts related to derivative financial liabilities 346,300 326,800
Other amounts values 8,800 23,500
UBS AG | Futures | Exchange-traded derivatives (ETD) | Interest rate contracts    
Derivative [Table]    
Other amounts values 525,000 480,600
UBS AG | Futures | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Other amounts values 71,200 67,900
UBS AG | Futures | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Other amounts values 13,900 9,300
UBS AG | Client-cleared transactions | Exchange-traded derivatives (ETD) | Equity contracts    
Derivative [Table]    
Derivative financial assets 8,600 10,700
Derivative financial liabilities 9,400 9,100
UBS AG | Client-cleared transactions | Exchange-traded derivatives (ETD) | Commodity contracts    
Derivative [Table]    
Derivative financial assets 600 500
Derivative financial liabilities 400 300
UBS AG | Credit default swaps | Over-the-counter (OTC) contracts | Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 1,300 2,200
Notional amounts related to derivative financial assets 39,400 53,600
Derivative financial liabilities 1,600 2,600
Notional amounts related to derivative financial liabilities 44,100 62,300
UBS AG | Total return swaps | Over-the-counter (OTC) contracts | Credit derivative contracts    
Derivative [Table]    
Derivative financial assets 100 100
Notional amounts related to derivative financial assets 1,300 1,900
Derivative financial liabilities 200 300
Notional amounts related to derivative financial liabilities $ 1,700 $ 2,500