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Derivative instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Derivative [Line Items]      
Derivative financial assets $ 185,949 $ 114,251 $ 150,108
Derivative financial liabilities 193,147 116,113 154,906
Other notional values 26,040,000 13,993,000 11,376,000
Notional values related to derivative financial assets and liabilities 13,010,000 10,224,000 9,302,000
Credit Suisse      
Derivative [Line Items]      
Derivative financial assets 63,200    
Derivative financial liabilities 66,700    
Other notional values 10,689,000    
Notional values related to derivative financial assets and liabilities 2,804,000    
Interest rate      
Derivative [Line Items]      
Derivative financial assets 63,700 36,700 39,800
Derivative financial liabilities 62,000 34,700 37,500
Other notional values 25,438,000 13,842,000 11,255,000
Notional values related to derivative financial assets and liabilities 3,788,000 2,345,000 2,080,000
Notional values related to derivative financial assets and liabilities related to over-the-counter derivatives 225,000    
Credit derivative      
Derivative [Line Items]      
Derivative financial assets 5,400 1,300 1,000
Derivative financial liabilities 6,200 1,300 1,200
Notional values related to derivative financial assets and liabilities 379,000 86,000 74,000
Foreign exchange      
Derivative [Line Items]      
Derivative financial assets 74,700 52,200 85,500
Derivative financial liabilities 76,600 53,300 88,500
Other notional values 82,000 56,000 40,000
Notional values related to derivative financial assets and liabilities 7,350,000 6,610,000 6,080,000
Equity / index      
Derivative [Line Items]      
Derivative financial assets 39,700 21,800 22,200
Derivative financial liabilities 45,300 24,600 26,100
Other notional values 497,000 76,000 63,000
Notional values related to derivative financial assets and liabilities 1,192,000 932,000 886,000
Commodity      
Derivative [Line Items]      
Derivative financial assets 1,700 1,800 1,400
Derivative financial liabilities 1,700 1,600 1,400
Other notional values 23,000 19,000 18,000
Notional values related to derivative financial assets and liabilities 159,000 146,000 132,000
Other      
Derivative [Line Items]      
Derivative financial assets 800 400 200
Derivative financial liabilities 1,300 600 100
Notional values related to derivative financial assets and liabilities $ 140,000 $ 106,000 $ 50,000