v3.26.1
Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 81 $ 84
Derivative liability 181 179
Interest rate forward sales commitments    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 1  
Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 80 84
Derivative liability 178 179
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 80 84
Derivative liability 178 179
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 $ 3 $ 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 $ 1 $ 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 $ 80 $ 84
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative liability $ 178 $ 179
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities