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Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) - Discounted Cash Flow [Member] $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | ---
Level 3 [Member] | Residential Mortgage [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure | $ 812 | $ 418 | $ 296
Commercial Mortgage Loans Held For Sale | Level 3 [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Assets, Fair Value Disclosure |  | $ 90 |
Recurring Fair Value Measurements [Member] | Minimum [Member] | Residential Mortgage [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Weighted Average CPR | 0.061 | 0.072 | 0.081
Option-Adjusted Spread | 4.80% | 3.70% | 4.80%
Recurring Fair Value Measurements [Member] | Maximum [Member] | Residential Mortgage [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Weighted Average CPR | 0.151 | 0.222 | 0.312
Option-Adjusted Spread | 8.20% | 7.70% | 9.50%
Recurring Fair Value Measurements [Member] | Weighted Average [Member] | Residential Mortgage [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Weighted Average CPR | 0.074 | 0.105 | 0.156
Option-Adjusted Spread | 5.10% | 4.50% | 5.60%
Recurring Fair Value Measurements [Member] | Commercial Mortgage Loans Held For Sale | Minimum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Loans Held-for-sale, Measurement Input |  | 0.002 |
Recurring Fair Value Measurements [Member] | Commercial Mortgage Loans Held For Sale | Maximum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Loans Held-for-sale, Measurement Input |  | 0.194 |
Recurring Fair Value Measurements [Member] | Commercial Mortgage Loans Held For Sale | Weighted Average [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Loans Held-for-sale, Measurement Input |  | 0.013 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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