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Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Millions	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential mortgage servicing rights	$ 770	$ 418
Loans held for sale, at fair value	369	783
Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for sale, at fair value	60	104
Recurring Fair Value Measurements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential mortgage servicing rights	770	418
Loans held for sale, at fair value	369	783
Recurring Fair Value Measurements [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential mortgage servicing rights	770	418
Loans held for sale, at fair value	57	90
Recurring Fair Value Measurements [Member] | Mortgage Servicing Rights [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential mortgage servicing rights	$ 770	$ 418
Recurring Fair Value Measurements [Member] | Mortgage Servicing Rights [Member] | Minimum [Member] | Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.062	0.072
Option-Adjusted Spread	4.40%	3.70%
Recurring Fair Value Measurements [Member] | Mortgage Servicing Rights [Member] | Maximum [Member] | Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.181	0.222
Option-Adjusted Spread	8.20%	7.70%
Recurring Fair Value Measurements [Member] | Mortgage Servicing Rights [Member] | Weighted Average [Member] | Discounted Cash Flow [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.079	0.105
Option-Adjusted Spread	4.80%	4.50%
Recurring Fair Value Measurements [Member] | Commercial Mortgage Loans Held For Sale | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held for sale, at fair value		$ 90
Recurring Fair Value Measurements [Member] | Commercial Mortgage Loans Held For Sale | Minimum [Member] | Valuation Technique, Discounted Cash Flow
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] | Valuation Technique, Discounted Cash Flow
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] | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans Held-for-sale, Measurement Input		0.013

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+ 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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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

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-URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746

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-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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