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Interest rate benchmark reform (Narrative) (Detail) - USD ($)
$ in Billions
Jun. 30, 2023
Dec. 31, 2022
Disclosure Of Maximum Exposure To Interest Rate Benchmark Reform [Line Items]    
US mortgages linked to USD LIBOR   $ 9
Corporate loans subject to interest rate benchmark reform $ 2  
Yen, pounds, sterling and US dollar denominated publicly issued benchmark bonds 6  
Credit Suisse    
Disclosure Of Maximum Exposure To Interest Rate Benchmark Reform [Line Items]    
Yen, pounds, sterling and US dollar denominated publicly issued benchmark notes $ 3