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MD&A - Risk management and control - Market Risk (Detail 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Value At Risk [Table]    
Management VaR $ 12 $ 11
Diversification effect (5) (8)
Global Wealth Management    
Value At Risk [Table]    
Management VaR 2 1
Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Investment Bank    
Value At Risk [Table]    
Management VaR 11 10
Group Functions    
Value At Risk [Table]    
Management VaR 4 6
Minimum    
Value At Risk [Table]    
Management VaR 4 8
Minimum | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 0
Minimum | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Minimum | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Minimum | Investment Bank    
Value At Risk [Table]    
Management VaR 3 7
Minimum | Group Functions    
Value At Risk [Table]    
Management VaR 4 4
Maximum    
Value At Risk [Table]    
Management VaR 36 31
Maximum | Global Wealth Management    
Value At Risk [Table]    
Management VaR 3 2
Maximum | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Maximum | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Maximum | Investment Bank    
Value At Risk [Table]    
Management VaR 36 32
Maximum | Group Functions    
Value At Risk [Table]    
Management VaR 8 7
Average    
Value At Risk [Table]    
Management VaR 11 13
Diversification effect (6) (5)
Average | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 1
Average | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Average | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Average | Investment Bank    
Value At Risk [Table]    
Management VaR 11 12
Average | Group Functions    
Value At Risk [Table]    
Management VaR 5 5
Equity prices    
Value At Risk [Table]    
Management VaR 8 6
Diversification effect 0 0
Equity prices | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
Equity prices | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Equity prices | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Equity prices | Investment Bank    
Value At Risk [Table]    
Management VaR 7 10
Equity prices | Group Functions    
Value At Risk [Table]    
Management VaR 0 0
Equity prices | Minimum    
Value At Risk [Table]    
Management VaR 1 3
Equity prices | Maximum    
Value At Risk [Table]    
Management VaR 35 29
Equity prices | Average    
Value At Risk [Table]    
Management VaR 7 10
Interest rate risk    
Value At Risk [Table]    
Management VaR 11 8
Diversification effect (5) (4)
Interest rate risk | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 1
Interest rate risk | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Interest rate risk | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Interest rate risk | Investment Bank    
Value At Risk [Table]    
Management VaR 9 7
Interest rate risk | Group Functions    
Value At Risk [Table]    
Management VaR 4 4
Interest rate risk | Minimum    
Value At Risk [Table]    
Management VaR 7 6
Interest rate risk | Maximum    
Value At Risk [Table]    
Management VaR 13 11
Interest rate risk | Average    
Value At Risk [Table]    
Management VaR 9 8
Credit spreads    
Value At Risk [Table]    
Management VaR 7 8
Diversification effect (5) (4)
Credit spreads | Global Wealth Management    
Value At Risk [Table]    
Management VaR 2 1
Credit spreads | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Credit spreads | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Credit spreads | Investment Bank    
Value At Risk [Table]    
Management VaR 7 6
Credit spreads | Group Functions    
Value At Risk [Table]    
Management VaR 4 3
Credit spreads | Minimum    
Value At Risk [Table]    
Management VaR 5 5
Credit spreads | Maximum    
Value At Risk [Table]    
Management VaR 11 11
Credit spreads | Average    
Value At Risk [Table]    
Management VaR 7 7
Foreign exchange    
Value At Risk [Table]    
Management VaR 6 3
Diversification effect (1) (1)
Foreign exchange | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
Foreign exchange | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Foreign exchange | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Foreign exchange | Investment Bank    
Value At Risk [Table]    
Management VaR 3 4
Foreign exchange | Group Functions    
Value At Risk [Table]    
Management VaR 1 1
Foreign exchange | Minimum    
Value At Risk [Table]    
Management VaR 1 2
Foreign exchange | Maximum    
Value At Risk [Table]    
Management VaR 9 7
Foreign exchange | Average    
Value At Risk [Table]    
Management VaR 3 4
Commodities    
Value At Risk [Table]    
Management VaR 3 3
Diversification effect 0 0
Commodities | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
Commodities | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
Commodities | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
Commodities | Investment Bank    
Value At Risk [Table]    
Management VaR 3 4
Commodities | Group Functions    
Value At Risk [Table]    
Management VaR 0 0
Commodities | Minimum    
Value At Risk [Table]    
Management VaR 2 2
Commodities | Maximum    
Value At Risk [Table]    
Management VaR 5 6
Commodities | Average    
Value At Risk [Table]    
Management VaR 3 4
UBS AG    
Value At Risk [Table]    
Management VaR 12 11
Diversification effect (5) (8)
UBS AG | Global Wealth Management    
Value At Risk [Table]    
Management VaR 2 1
UBS AG | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Investment Bank    
Value At Risk [Table]    
Management VaR 11 10
UBS AG | Group Functions    
Value At Risk [Table]    
Management VaR 4 6
UBS AG | Minimum    
Value At Risk [Table]    
Management VaR 4 8
UBS AG | Minimum | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 0
UBS AG | Minimum | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Minimum | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Minimum | Investment Bank    
Value At Risk [Table]    
Management VaR 3 7
UBS AG | Minimum | Group Functions    
Value At Risk [Table]    
Management VaR 4 4
UBS AG | Maximum    
Value At Risk [Table]    
Management VaR 36 31
UBS AG | Maximum | Global Wealth Management    
Value At Risk [Table]    
Management VaR 3 2
UBS AG | Maximum | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Maximum | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Maximum | Investment Bank    
Value At Risk [Table]    
Management VaR 36 32
UBS AG | Maximum | Group Functions    
Value At Risk [Table]    
Management VaR 8 7
UBS AG | Average    
Value At Risk [Table]    
Management VaR 11 13
Diversification effect (6) (5)
UBS AG | Average | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 1
UBS AG | Average | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Average | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Average | Investment Bank    
Value At Risk [Table]    
Management VaR 11 12
UBS AG | Average | Group Functions    
Value At Risk [Table]    
Management VaR 5 5
UBS AG | Equity prices    
Value At Risk [Table]    
Management VaR 8 6
Diversification effect 0 0
UBS AG | Equity prices | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Equity prices | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Equity prices | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Equity prices | Investment Bank    
Value At Risk [Table]    
Management VaR 7 10
UBS AG | Equity prices | Group Functions    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Equity prices | Minimum    
Value At Risk [Table]    
Management VaR 1 3
UBS AG | Equity prices | Maximum    
Value At Risk [Table]    
Management VaR 35 29
UBS AG | Equity prices | Average    
Value At Risk [Table]    
Management VaR 7 10
UBS AG | Interest rate risk    
Value At Risk [Table]    
Management VaR 11 8
Diversification effect (5) (4)
UBS AG | Interest rate risk | Global Wealth Management    
Value At Risk [Table]    
Management VaR 1 1
UBS AG | Interest rate risk | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Interest rate risk | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Interest rate risk | Investment Bank    
Value At Risk [Table]    
Management VaR 9 7
UBS AG | Interest rate risk | Group Functions    
Value At Risk [Table]    
Management VaR 4 4
UBS AG | Interest rate risk | Minimum    
Value At Risk [Table]    
Management VaR 7 6
UBS AG | Interest rate risk | Maximum    
Value At Risk [Table]    
Management VaR 13 11
UBS AG | Interest rate risk | Average    
Value At Risk [Table]    
Management VaR 9 8
UBS AG | Credit spreads    
Value At Risk [Table]    
Management VaR 7 8
Diversification effect (5) (4)
UBS AG | Credit spreads | Global Wealth Management    
Value At Risk [Table]    
Management VaR 2 1
UBS AG | Credit spreads | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Credit spreads | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Credit spreads | Investment Bank    
Value At Risk [Table]    
Management VaR 7 6
UBS AG | Credit spreads | Group Functions    
Value At Risk [Table]    
Management VaR 4 3
UBS AG | Credit spreads | Minimum    
Value At Risk [Table]    
Management VaR 5 5
UBS AG | Credit spreads | Maximum    
Value At Risk [Table]    
Management VaR 11 11
UBS AG | Credit spreads | Average    
Value At Risk [Table]    
Management VaR 7 7
UBS AG | Foreign exchange    
Value At Risk [Table]    
Management VaR 6 3
Diversification effect (1) (1)
UBS AG | Foreign exchange | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Foreign exchange | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Foreign exchange | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Foreign exchange | Investment Bank    
Value At Risk [Table]    
Management VaR 3 4
UBS AG | Foreign exchange | Group Functions    
Value At Risk [Table]    
Management VaR 1 1
UBS AG | Foreign exchange | Minimum    
Value At Risk [Table]    
Management VaR 1 2
UBS AG | Foreign exchange | Maximum    
Value At Risk [Table]    
Management VaR 9 7
UBS AG | Foreign exchange | Average    
Value At Risk [Table]    
Management VaR 3 4
UBS AG | Commodities    
Value At Risk [Table]    
Management VaR 3 3
Diversification effect 0 0
UBS AG | Commodities | Global Wealth Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Commodities | Personal & Corporate Banking    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Commodities | Asset Management    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Commodities | Investment Bank    
Value At Risk [Table]    
Management VaR 3 4
UBS AG | Commodities | Group Functions    
Value At Risk [Table]    
Management VaR 0 0
UBS AG | Commodities | Minimum    
Value At Risk [Table]    
Management VaR 2 2
UBS AG | Commodities | Maximum    
Value At Risk [Table]    
Management VaR 5 6
UBS AG | Commodities | Average    
Value At Risk [Table]    
Management VaR $ 3 $ 4