v3.26.3
Commitments, Contingencies, And Guarantees (Narrative) (Detail)
SFr in Thousands, € in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
EUR (€)
Mar. 17, 2026
CHF (SFr)
Dec. 31, 2025
USD ($)
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 31   $ 31       $ 179
Repurchase agreements 3,225   3,225       3,324
Operating Lease, Right-of-Use Asset 1,027   1,027       1,025
Operating Lease, Liability $ 1,260   $ 1,260       $ 1,214
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities   Other liabilities   Other liabilities   Other liabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets (includes VIE balances of $59 and $58)   Other assets (includes VIE balances of $59 and $58)   Other assets (includes VIE balances of $59 and $58)   Other assets (includes VIE balances of $59 and $58)
Fair Value Hedging              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Hedged Liability, Fair Value Hedge $ 2,000   $ 2,000   € 1,700    
Bonds | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     1,300        
CAD Bonds [Domain] | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     579        
Loans | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     593        
Unsecured Debt | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     432        
Currency Swap [Member] | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Derivative, Notional Amount 5,786   5,786       $ 5,041
Currency Swap [Member] | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Derivative Notional Amount Terminated | SFr           SFr 95,800  
OCI, before Reclassifications, before Tax, Attributable to Parent (287) $ 61 (212) $ (53)      
Derivative, Notional Amount 3,702   3,702       2,995
OCI, before Reclassifications, before Tax, Attributable to Parent (287) 61 (212) (53)      
Derivative Notional Amount Terminated | SFr           SFr 95,800  
Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
OCI, before Reclassifications, before Tax, Attributable to Parent (9) (17) (36) 98      
Derivative, Notional Amount 2,084   2,084       $ 2,046
OCI, before Reclassifications, before Tax, Attributable to Parent $ (9) $ (17) $ (36) $ 98