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Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) - Mortgage Servicing Rights [Member] - Discounted Cash Flow [Member]
$ in Millions
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure $ 392 [1] $ 296 [2]
Recurring Fair Value Measurements [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average CPR 0.066 0.081
Option-Adjusted Spread 4.80% 4.80%
Recurring Fair Value Measurements [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average CPR 0.222 0.312
Option-Adjusted Spread 9.40% 9.50%
Recurring Fair Value Measurements [Member] | Weighted Average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted Average CPR 0.105 0.156
Option-Adjusted Spread 5.70% 5.60%
[1] See Note 4 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.
[2] See Note 7 to the consolidated financial statements of the Annual Report on Form 10-K for the year ended December 31, 2020 for additional disclosures related to assumptions used in the fair value calculation for residential mortgage servicing rights.