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Derivatives (Summary Of Types Of Derivatives, Separately By Assets And Liabilities And Fair Value Of Derivatives) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 88 $ 109
Derivative Liability 194 281
Interest rate forward sales commitments    
Derivatives, Fair Value [Line Items]    
Asset Derivatives   1
Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 88 107
Derivative Liability 193 277
Interest rate contracts    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 88 107
Derivative Liability 193 277
Interest rate contracts | Future    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 0 0
Derivative Liability $ 1 $ 3
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
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 $ 0 $ 1
Derivative Liability $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
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 $ 88 $ 107
Derivative Liability $ 193 $ 277
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Foreign currency derivatives    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 0 $ 1
Derivative Liability $ 0 $ 1
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities