Expected credit loss measurement - Sensitivity analysis (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	$ (1,360)
Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	2,100
Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	5,690
Baseline ECL scenario | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(7,400)
Baseline ECL scenario | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(3,780)
Baseline ECL scenario | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	4,150
Baseline ECL scenario | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	8,500
Baseline ECL scenario | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,720
Baseline ECL scenario | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	1,860
Baseline ECL scenario | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,460)
Baseline ECL scenario | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,970)
Baseline ECL scenario | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	8,040
Baseline ECL scenario | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,450
Baseline ECL scenario | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,790)
Baseline ECL scenario | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(5,160)
Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,940
Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	1,910
Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(8,300)
Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(10,140)
Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,840)
Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,190
Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	6,860
Severe downside ECL scenario | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(63,010)
Severe downside ECL scenario | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(33,540)
Severe downside ECL scenario | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	36,970
Severe downside ECL scenario | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	75,930
Severe downside ECL scenario | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	16,140
Severe downside ECL scenario | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,840
Severe downside ECL scenario | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(3,300)
Severe downside ECL scenario | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(9,440)
Severe downside ECL scenario | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	144,340
Severe downside ECL scenario | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	65,800
Severe downside ECL scenario | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(56,600)
Severe downside ECL scenario | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(105,610)
Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,660
Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	4,290
Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(4,230)
Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(8,580)
Weighted average | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,930)
Weighted average | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,230
Weighted average | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	7,190
Weighted average | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(27,830)
Weighted average | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(15,670)
Weighted average | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	16,990
Weighted average | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	33,740
Weighted average | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,100
Weighted average | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	5,090
Weighted average | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,360)
Weighted average | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(5,930)
Weighted average | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	51,460
Weighted average | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	23,280
Weighted average | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(19,090)
Weighted average | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(35,290)
Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	6,780
Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,340
Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(7,270)
Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(10,220)
UBS AG | Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,360)
UBS AG | Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	2,100
UBS AG | Baseline ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	5,690
UBS AG | Baseline ECL scenario | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(7,400)
UBS AG | Baseline ECL scenario | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(3,780)
UBS AG | Baseline ECL scenario | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	4,150
UBS AG | Baseline ECL scenario | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	8,500
UBS AG | Baseline ECL scenario | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,720
UBS AG | Baseline ECL scenario | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	1,860
UBS AG | Baseline ECL scenario | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,460)
UBS AG | Baseline ECL scenario | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,970)
UBS AG | Baseline ECL scenario | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	8,040
UBS AG | Baseline ECL scenario | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,450
UBS AG | Baseline ECL scenario | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,790)
UBS AG | Baseline ECL scenario | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(5,160)
UBS AG | Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,940
UBS AG | Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	1,910
UBS AG | Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(8,300)
UBS AG | Baseline ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(10,140)
UBS AG | Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,840)
UBS AG | Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,190
UBS AG | Severe downside ECL scenario | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	6,860
UBS AG | Severe downside ECL scenario | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(63,010)
UBS AG | Severe downside ECL scenario | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(33,540)
UBS AG | Severe downside ECL scenario | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	36,970
UBS AG | Severe downside ECL scenario | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	75,930
UBS AG | Severe downside ECL scenario | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	16,140
UBS AG | Severe downside ECL scenario | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,840
UBS AG | Severe downside ECL scenario | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(3,300)
UBS AG | Severe downside ECL scenario | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(9,440)
UBS AG | Severe downside ECL scenario | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	144,340
UBS AG | Severe downside ECL scenario | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	65,800
UBS AG | Severe downside ECL scenario | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(56,600)
UBS AG | Severe downside ECL scenario | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(105,610)
UBS AG | Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,660
UBS AG | Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	4,290
UBS AG | Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(4,230)
UBS AG | Severe downside ECL scenario | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(8,580)
UBS AG | Weighted average | Fixed income: 10-year government bonds (relative change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(1,930)
UBS AG | Weighted average | Fixed income: 10-year government bonds (relative change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,230
UBS AG | Weighted average | Fixed income: 10-year government bonds (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	7,190
UBS AG | Weighted average | Unemployment rate (absolute change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(27,830)
UBS AG | Weighted average | Unemployment rate (absolute change) | Minus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(15,670)
UBS AG | Weighted average | Unemployment rate (absolute change) | Plus 0.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	16,990
UBS AG | Weighted average | Unemployment rate (absolute change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	33,740
UBS AG | Weighted average | Real GDP growth (relative change) | Minus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	9,100
UBS AG | Weighted average | Real GDP growth (relative change) | Minus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	5,090
UBS AG | Weighted average | Real GDP growth (relative change) | Plus 1.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(2,360)
UBS AG | Weighted average | Real GDP growth (relative change) | Plus 2.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(5,930)
UBS AG | Weighted average | House Price Index (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	51,460
UBS AG | Weighted average | House Price Index (relative change) | Minus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	23,280
UBS AG | Weighted average | House Price Index (relative change) | Plus 2.50 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(19,090)
UBS AG | Weighted average | House Price Index (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(35,290)
UBS AG | Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	6,780
UBS AG | Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Minus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	3,340
UBS AG | Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 5.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	(7,270)
UBS AG | Weighted average | Equity (S&P500, EuroStoxx, SMI) (relative change) | Plus 10.00 percent
Disclosure Of Key Macro Economic Variables Used For Expected Credit Loss Model [Line Items]
Economic forecast financial effect	$ (10,220)