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FVM - Movements of level 3 instruments - Liabilities (Detail) - Level 3 - USD ($)
$ in Billions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Derivative financial instruments    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period $ 1.7 $ 2.2
Credit Suisse liabilities acquired 2.8  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.6 (0.6)
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.5 (0.6)
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 0.8 0.9
Settlements (0.4) (0.8)
Transfers into Level 3 0.1 0.1
Transfers out of Level 3 (0.3) (0.1)
Foreign currency translation 0.0 (0.1)
Balance at the end of period 5.3 1.7
Derivative financial instruments | Interest rate contracts    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period 0.1 0.3
Credit Suisse liabilities acquired 0.2  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.0 (0.2)
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.0 (0.2)
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 0.1 0.1
Settlements (0.1) (0.0)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (0.0) (0.0)
Foreign currency translation 0.0 0.0
Balance at the end of period 0.4 0.1
Derivative financial instruments | Equity / index contracts    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period 1.2 1.5
Credit Suisse liabilities acquired 1.7  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.5 (0.3)
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.5 (0.3)
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 0.6 0.6
Settlements (0.3) (0.7)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (0.1) (0.1)
Foreign currency translation 0.0 0.0
Balance at the end of period 3.7 1.1
Derivative financial instruments | Credit derivative contracts    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period 0.3 0.3
Credit Suisse liabilities acquired 0.3  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.0 (0.1)
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.0 (0.1)
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 0.1 0.1
Settlements (0.0) (0.0)
Transfers into Level 3 0.1 0.1
Transfers out of Level 3 (0.2) (0.0)
Foreign currency translation 0.0 0.0
Balance at the end of period 0.6 0.4
Debt issued designated at fair value    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period 10.5 14.2
Credit Suisse liabilities acquired 8.5  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.4 (2.5)
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.4 (2.3)
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 2.4 4.2
Settlements (2.5) (2.7)
Transfers into Level 3 0.6 0.7
Transfers out of Level 3 (0.8) (1.5)
Foreign currency translation 0.0 (0.4)
Balance at the end of period 19.1 12.0
Other financial liabilities designated at fair value    
Disclosure Of Fair Value Measurement Of Liabilities [Line Items]    
Balance at the beginning of the period 0.7 0.8
Credit Suisse liabilities acquired 2.1  
Total gains / losses included in comprehensive income - Net gains / losses included in income 0.0 0.0
Total gains / losses included in comprehensive income - of which: related to Level 3 instruments held at the end of the reporting period 0.0 0.0
Purchases 0.0 0.0
Sales (0.0) (0.0)
Issuances 0.2 0.2
Settlements (0.1) (0.1)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (0.0) (0.0)
Foreign currency translation 0.0 0.0
Balance at the end of period $ 3.0 $ 0.9