v3.26.1
Commitments, Contingencies, And Guarantees (Narrative) (Detail)
SFr in Thousands, € in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 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 $ 105   $ 105       $ 179
Repurchase agreements 3,368   3,368       3,324
Operating Lease, Right-of-Use Asset 1,002   1,002       1,025
Operating Lease, Liability $ 1,234   $ 1,234       $ 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 $110 and $58)   Other assets (includes VIE balances of $110 and $58)   Other assets (includes VIE balances of $110 and $58)   Other assets (includes VIE balances of $110 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     574        
Loans | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     586        
Unsecured Debt | Net Investment Hedging | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Notional Amount of Nonderivative Instruments     250        
Currency Swap [Member] | Designated as Hedging Instrument              
Financial Instruments Owned and Pledged as Collateral [Line Items]              
Derivative, Notional Amount 5,955   5,955       $ 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 17 $ (138) 75 $ (114)      
Derivative, Notional Amount 3,874   3,874       2,995
OCI, before Reclassifications, before Tax, Attributable to Parent 17 (138) 75 (114)      
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 16 141 (27) 115      
Derivative, Notional Amount 2,081   2,081       $ 2,046
OCI, before Reclassifications, before Tax, Attributable to Parent $ 16 $ 141 $ (27) $ 115