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Allowance For Credit Losses (ModificationsByClassAndSegment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 887
Term Extension, Percentage	0.90%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 696
Term Extension, Percentage	0.71%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 142
Term Extension, Percentage	0.14%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 12
Term Extension, Percentage	0.01%
Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 37
Term Extension, Percentage	0.04%
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 561
Term Extension, Percentage	1.00%
Commercial Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 384
Term Extension, Percentage	0.68%
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated	$ 106
Commercial Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 140
Term Extension, Percentage	0.25%
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial Portfolio Segment [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 37
Term Extension, Percentage	0.07%
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 213
Term Extension, Percentage	2.41%
Total Investor Real Estate [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 213
Term Extension, Percentage	2.41%
Total Investor Real Estate [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Total Investor Real Estate [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Total Investor Real Estate [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 113
Term Extension, Percentage	0.34%
Consumer Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 99
Term Extension, Percentage	0.29%
Consumer Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2
Term Extension, Percentage	0.01%
Consumer Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 12
Term Extension, Percentage	0.03%
Consumer Portfolio Segment [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 555
Term Extension, Percentage	1.09%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 379
Term Extension, Percentage	0.75%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 139
Term Extension, Percentage	0.27%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial And Industrial [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 37
Term Extension, Percentage	0.07%
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3
Term Extension, Percentage	0.06%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3
Term Extension, Percentage	0.05%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3
Term Extension, Percentage	0.81%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2
Term Extension, Percentage	0.67%
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1
Term Extension, Percentage	0.15%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 213
Term Extension, Percentage	3.23%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 213
Term Extension, Percentage	3.23%
Commercial investor real estate mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial investor real estate mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Commercial investor real estate mortgage [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 99
Term Extension, Percentage	0.49%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 94
Term Extension, Percentage	0.46%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2
Term Extension, Percentage	0.01%
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3
Term Extension, Percentage	0.02%
Residential First Mortgage [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 5
Term Extension, Percentage	0.13%
Home Equity Lines of Credit[Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1
Term Extension, Percentage	0.02%
Home Equity Lines of Credit[Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 4
Term Extension, Percentage	0.11%
Home Equity Lines of Credit[Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 9
Term Extension, Percentage	0.35%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 4
Term Extension, Percentage	0.17%
Home Equity Loan [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 5
Term Extension, Percentage	0.18%
Home Equity Loan [Member] | Extended Maturity and Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0
Term Extension, Percentage	0.00%

X

- Definition

Accumulated amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

+ Details

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Period Type:	instant

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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X

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ 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

+ Details

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X

- 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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

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-Topic 310
-SubTopic 10
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-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

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