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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

Option-Adjusted Spread

+ References

No definition available.

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Value of input used to measure loan, held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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