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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 | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Level 3 [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,020 | $ 906
Recurring Fair Value Measurements | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average CPR | 0.043 | 0.056
Option-Adjusted Spread | 4.60% | 4.50%
Recurring Fair Value Measurements | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Weighted Average CPR | 0.256 | 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 | 0.082 | 0.082
Option-Adjusted Spread | 4.90% | 4.80%

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