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Hedge accounting (Detail 4.2) - Cash flow hedges of forecast transactions - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain Loss On Cash Flow Hedges Of Interest Rate Risk Recognized In Earnings [Line Items]      
Effective portion of changes in fair value of hedging instruments recognized as Other comprehensive income $ 1,571 $ (42) $ 45
Interest Rate Risk [Member] | Hedging instruments: Interest rate swaps      
Gain Loss On Cash Flow Hedges Of Interest Rate Risk Recognized In Earnings [Line Items]      
Changes in fair value of hedging instruments [1] 1,639 97  
Changes in fair value of hedged items [1] (1,571) (73)  
Effective portion of changes in fair value of hedging instruments recognized as Other comprehensive income 1,571 (42) 45
Ineffectiveness recognised as Other net income from fair value changes on financial instruments 68 25 8
UBS AG      
Gain Loss On Cash Flow Hedges Of Interest Rate Risk Recognized In Earnings [Line Items]      
Effective portion of changes in fair value of hedging instruments recognized as Other comprehensive income 1,571 (42) 45
UBS AG | Interest Rate Risk [Member] | Hedging instruments: Interest rate swaps      
Gain Loss On Cash Flow Hedges Of Interest Rate Risk Recognized In Earnings [Line Items]      
Changes in fair value of hedging instruments [1] 1,639 97  
Changes in fair value of hedged items [1] (1,571) (73)  
Effective portion of changes in fair value of hedging instruments recognized as Other comprehensive income 1,571 (42) 45
Ineffectiveness recognised as Other net income from fair value changes on financial instruments $ 68 $ 25 $ 8
[1]
This Note addresses the requirement of IFRS 7 effective from 1 January 2018, for which data is provided prospectively.