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Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) - Discounted Cash Flow [Member] $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Level 3 [Member] | Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 1,007	$ 906
Level 3 [Member] | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 97	$ 81
Recurring Fair Value Measurements | Minimum [Member] | Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.046	0.056
Option-Adjusted Spread	4.80%	4.50%
Recurring Fair Value Measurements | Minimum [Member] | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.054	0.054
Measurement Input, Discount Rate	7.00%	7.00%
Recurring Fair Value Measurements | Maximum [Member] | Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.231	0.215
Option-Adjusted Spread	7.70%	8.20%
Recurring Fair Value Measurements | Maximum [Member] | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.106	0.115
Measurement Input, Discount Rate	8.00%	8.00%
Recurring Fair Value Measurements | Weighted Average [Member] | Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.080	0.082
Option-Adjusted Spread	5.10%	4.80%
Recurring Fair Value Measurements | Weighted Average [Member] | Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.077	0.081
Measurement Input, Discount Rate	7.10%	7.10%

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Fair value portion of asset recognized for present right to economic benefit.

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