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Hedge accounting (Detail 4.1) - Cash flow hedges of forecast transactions - Interest rate risk - Hedging instruments: Interest rate swaps - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Nominal And Carrying Amount Of Cash Flow Hedges Of Forecast Transactions [Line Items]    
Nominal amount $ 69,443 $ 70,149
Derivative financial assets 16 24
Derivative financial liabilities   1
UBS AG    
Nominal And Carrying Amount Of Cash Flow Hedges Of Forecast Transactions [Line Items]    
Nominal amount 69,443 70,149
Derivative financial assets $ 16 24
Derivative financial liabilities   $ 1