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FVM - Level 3 instruments: Valuation techniques and inputs (Detail) - Level 3
$ in Billions
 3 Months Ended
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 1.4 $ 0.8
Financial liabilities measured at fair value $ 0.1 $ 0.0
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Relative value to market comparable | Bond price equivalent (% of par) | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.04 0.14
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Relative value to market comparable | Bond price equivalent (% of par) | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1.01 1.12
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Relative value to market comparable | Bond price equivalent (% of par) | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.94 0.85
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Discounted expected cash flows | Discount margin | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0200 0.0412
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Discounted expected cash flows | Discount margin | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0391 0.0412
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Corporate and municipal bonds | Discounted expected cash flows | Discount margin | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0376  
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 9.2 $ 1.7
Financial liabilities measured at fair value $ 0.0 $ 0.0
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Relative value to market comparable | Loan price equivalent (% of par) | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0 0.30
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Relative value to market comparable | Loan price equivalent (% of par) | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1.40 1
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Relative value to market comparable | Loan price equivalent (% of par) | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.87 0.97
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Discounted expected cash flows | Credit spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0060 0.0200
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Discounted expected cash flows | Credit spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.3263 0.0200
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Discounted expected cash flows | Credit spread | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0347 0.0200
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Market comparable and securitization model | Credit spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0165 0.0145
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Market comparable and securitization model | Credit spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.1544 0.1350
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Market comparable and securitization model | Credit spread | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0349 0.0322
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Option model | Gap risk | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0  
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Option model | Gap risk | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.02  
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Traded loans, loans mandatorily at fair value, loan commitments and guarantees | Option model | Gap risk | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0  
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Auction rate securities    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 1.3 $ 1.3
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Auction rate securities | Discounted expected cash flows | Credit spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0115 0.0115
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Auction rate securities | Discounted expected cash flows | Credit spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0209 0.0196
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Auction rate securities | Discounted expected cash flows | Credit spread | weighted average    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0156 0.0144
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Investment fund units    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 0.8 $ 0.3
Financial liabilities measured at fair value 0.0 0.0
Financial assets and liabilities at fair value held for trading, Financial assets at fair value not held for trading: Equity instruments    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value 3.5 0.9
Financial liabilities measured at fair value 0.1 0.1
Debt issued designated at fair value    
Disclosure Of Fair Value Measurement [Line Items]    
Financial liabilities measured at fair value 19.1 10.5
Other financial liabilities designated at fair value    
Disclosure Of Fair Value Measurement [Line Items]    
Financial liabilities measured at fair value $ 3.0 $ 0.7
Other financial liabilities designated at fair value | Discounted expected cash flows | Funding spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0025 0.0023
Other financial liabilities designated at fair value | Discounted expected cash flows | Funding spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0175 0.0175
Derivative financial instruments: Interest rate contracts    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 0.8 $ 0.5
Financial liabilities measured at fair value $ 0.3 $ 0.1
Derivative financial instruments: Interest rate contracts | Option model | Volatility of inflation | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0  
Derivative financial instruments: Interest rate contracts | Option model | Volatility of inflation | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.06  
Derivative financial instruments: Interest rate contracts | Option model | IR-to-IR correlation | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) (0.01)  
Derivative financial instruments: Interest rate contracts | Option model | IR-to-IR correlation | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1  
Derivative financial instruments: Interest rate contracts | Option model | Volatility of interest rates | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0055 0.0075
Derivative financial instruments: Interest rate contracts | Option model | Volatility of interest rates | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0161 0.0143
Derivative financial instruments: Credit derivative contracts    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 0.6 $ 0.3
Financial liabilities measured at fair value $ 0.7 $ 0.3
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Bond price equivalent (% of par) | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.03 0.03
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Bond price equivalent (% of par) | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 2.81 2.77
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Credit spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0005 0.0009
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Credit spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0538 0.0565
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Recovery rates | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.01  
Derivative financial instruments: Credit derivative contracts | Discounted expected cash flows | Recovery rates | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1  
Derivative financial instruments: Credit derivative contracts | Option model | Credit spread | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0017  
Derivative financial instruments: Credit derivative contracts | Option model | Credit spread | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.0707  
Derivative financial instruments: Equity / index contracts    
Disclosure Of Fair Value Measurement [Line Items]    
Financial assets measured at fair value $ 1.1 $ 0.7
Financial liabilities measured at fair value $ 3.8 $ 1.2
Derivative financial instruments: Equity / index contracts | Option model | Equity dividend yields | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0 0
Derivative financial instruments: Equity / index contracts | Option model | Equity dividend yields | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.10 0.20
Derivative financial instruments: Equity / index contracts | Option model | Volatility of equity stocks, equity and other indices | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.04 0.04
Derivative financial instruments: Equity / index contracts | Option model | Volatility of equity stocks, equity and other indices | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1.38 1.20
Derivative financial instruments: Equity / index contracts | Option model | Equity-to-equity correlation | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) (0.25) (0.25)
Derivative financial instruments: Equity / index contracts | Option model | Equity-to-equity correlation | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 1 1
Derivative financial instruments: Equity / index contracts | Option model | Equity-to-FX correlation | low    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) (0.40) (0.29)
Derivative financial instruments: Equity / index contracts | Option model | Equity-to-FX correlation | high    
Disclosure Of Fair Value Measurement [Line Items]    
Significant unobservable input(s) 0.84 0.84