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Allowance For Credit Losses (TDRs on Financing Receivables) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) obligor	Dec. 31, 2021 USD ($) obligor
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	1,360	755
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 385	$ 301
Increase in Allowance at Modification	$ 10	$ 8
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	50	65
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 174	$ 116
Increase in Allowance at Modification	$ 0	$ 0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	11	28
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 5	$ 11
Increase in Allowance at Modification	$ 0	$ 0
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3	$ 2
Increase in Allowance at Modification	$ 0	$ 0
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	5	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 48	$ 77
Increase in Allowance at Modification	$ 0	$ 0
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	983	492
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 135	$ 85
Increase in Allowance at Modification	$ 6	$ 8
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	94	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 6	$ 1
Increase in Allowance at Modification	$ 4	$ 0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	208	72
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 14	$ 6
Increase in Allowance at Modification	$ 0	$ 0
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	4	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Other consumer- exit portfolios
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Indirect-vehicles and other consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	5	80
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 3
Increase in Allowance at Modification	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	61	95
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 182	$ 129
Increase in Allowance at Modification	$ 0	$ 0
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	5	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 48	$ 77
Increase in Allowance at Modification	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	1,294	652
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 155	$ 95
Increase in Allowance at Modification	$ 10	$ 8

X

- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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