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Allowance For Credit Losses (ModificationsByClassAndSegment) (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
Term Extension, Percentage	0.19%	0.38%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 160	$ 189
Term Extension, Percentage	0.16%	0.19%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 24	$ 182
Term Extension, Percentage	0.02%	0.18%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2	$ 5
Term Extension, Percentage	0.00%	0.01%
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 92	$ 256
Term Extension, Percentage	0.16%	0.45%
Commercial Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 68	$ 74
Term Extension, Percentage	0.12%	0.13%
Commercial Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 24	$ 182
Term Extension, Percentage	0.04%	0.32%
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 31	$ 57
Term Extension, Percentage	0.09%	0.17%
Consumer Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 29	$ 52
Term Extension, Percentage	0.09%	0.16%
Consumer Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Consumer Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2	$ 5
Term Extension, Percentage	0.01%	0.02%
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 81	$ 243
Term Extension, Percentage	0.15%	0.47%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 57	$ 61
Term Extension, Percentage	0.11%	0.12%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 24	$ 182
Term Extension, Percentage	0.05%	0.35%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 8	$ 10
Term Extension, Percentage	0.17%	0.21%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 8	$ 10
Term Extension, Percentage	0.17%	0.21%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3	$ 3
Term Extension, Percentage	0.81%	0.81%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3	$ 3
Term Extension, Percentage	0.66%	0.66%
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.15%	0.00%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 27	$ 50
Term Extension, Percentage	0.14%	0.25%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 27	$ 49
Term Extension, Percentage	0.14%	0.24%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 1
Term Extension, Percentage	0.00%	0.01%
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 2
Term Extension, Percentage	0.03%	0.06%
Home Equity Lines of Credit[Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 1
Term Extension, Percentage	0.00%	0.02%
Home Equity Lines of Credit[Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Home Equity Lines of Credit[Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 1
Term Extension, Percentage	0.02%	0.04%
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3	$ 5
Term Extension, Percentage	0.11%	0.21%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2	$ 2
Term Extension, Percentage	0.06%	0.10%
Home Equity Loan [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 3
Term Extension, Percentage	0.06%	0.11%
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 63	$ 63
Term Extension, Percentage	0.98%	0.98%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 63	$ 63
Term Extension, Percentage	0.98%	0.98%
Commercial investor real estate mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Commercial investor real estate mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 63	$ 63
Term Extension, Percentage	0.73%	0.73%
Total Investor Real Estate [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 63	$ 63
Term Extension, Percentage	0.73%	0.73%
Total Investor Real Estate [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%
Total Investor Real Estate [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0
Term Extension, Percentage	0.00%	0.00%

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

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+ 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

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+ 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)
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-Topic 310
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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-Topic 310
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