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Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) - Discounted Cash Flow [Member] - Residential Mortgage $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 971	$ 906
Recurring Fair Value Measurements | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.045	0.056
Option-Adjusted Spread	4.70%	4.50%
Recurring Fair Value Measurements | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.354	0.215
Option-Adjusted Spread	7.70%	8.20%
Recurring Fair Value Measurements | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.090	0.082
Option-Adjusted Spread	5.00%	4.80%

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