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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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