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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 186	$ 376
Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	134	303
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	6
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	1
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	51	66
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	81	243
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	52	198
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	2
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	29	43
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	8	10
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	4	6
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	4	4
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	3
Commercial Real Estate Construction - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	2
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	92	256
Commercial Portfolio Segment [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	58	206
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	2
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Portfolio Segment [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	34	48
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	63	63
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	48	48
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial investor real estate mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial investor real estate mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	15	15
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	63	63
Total Investor Real Estate [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	48	48
Total Investor Real Estate [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Total Investor Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Total Investor Real Estate [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	15	15
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	27	50
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	25	44
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	4
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	1
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	2
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Home Equity Lines of Credit[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Home Equity Lines of Credit[Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	1
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	5
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	4
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Home Equity Loan [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	31	57
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	28	49
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	4
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	1
Consumer Portfolio Segment [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2	$ 3

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Topic 310
-SubTopic 10
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-Section 50
-Paragraph 34
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