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Fair Value Measurement (Schedule Of A Description Of The Valuation Technique, Unobservable Input, And Qualitative Information For The Company's Assets And Liabilities Classified As Level 3) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residential mortgage servicing rights, at fair value $ 101 $ 108
Junior subordinated debentures, at fair value 331 331
Residential mortgage servicing rights    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residential mortgage servicing rights, at fair value 101 108
Junior subordinated debentures    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Junior subordinated debentures, at fair value 331 331
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residential mortgage servicing rights, at fair value 101 108
Junior subordinated debentures, at fair value $ 331 $ 331
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Weighted Average | Constant prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0794 0.0692
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.1020 0.1023
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Minimum | Constant prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0577 0.0577
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Minimum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.0950 0.0950
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Maximum | Constant prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.3132 0.6085
Level 3 | Discounted cash flow | Residential mortgage servicing rights | Maximum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Servicing asset, measurement input 0.1626 0.1616
Level 3 | Discounted cash flow | Junior subordinated debentures | Weighted Average | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt instrument, measurement input 0.0308 0.0306
Level 3 | Discounted cash flow | Junior subordinated debentures | Minimum | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt instrument, measurement input 0.0212 0.0146
Level 3 | Discounted cash flow | Junior subordinated debentures | Maximum | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt instrument, measurement input 0.0428 0.0415