v3.26.3
Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 148 $ 84
Derivative liability 285 179
Interest rate forward sales commitments    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 2  
Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 146 84
Derivative liability 279 179
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 146 84
Derivative liability 279 179
Interest rate contracts | Future    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative liability $ 5 $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Interest rate contracts | Interest rate forward sales commitments    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 2 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative liability $ 0 $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Interest rate contracts | Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 146 $ 84
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative liability $ 279 $ 179
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Foreign currency derivatives    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative liability $ 1 $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities