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Allowance For Credit Losses (ModificationsByClassAndSegment) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 185	$ 212	$ 773
Term Extension, Percentage	0.19%	0.22%
Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 181	$ 45
Term Extension, Percentage	0.19%	0.05%
Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 164
Term Extension, Percentage		0.17%
Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 4	$ 3
Term Extension, Percentage	0.00%	0.00%
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 41	$ 185	347
Term Extension, Percentage	0.07%	0.32%
Commercial Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 41	$ 21
Term Extension, Percentage	0.07%	0.04%
Commercial Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 164
Term Extension, Percentage		0.29%
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%
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 100		300
Term Extension, Percentage	1.14%
Total Investor Real Estate [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 100
Term Extension, Percentage	1.14%
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%
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 44	$ 27	126
Term Extension, Percentage	0.13%	0.09%
Consumer Portfolio Segment [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 40	$ 24
Term Extension, Percentage	0.12%	0.07%
Consumer Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 0
Term Extension, Percentage		0.00%
Consumer Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 4	$ 3
Term Extension, Percentage	0.01%	0.01%
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 40	$ 182	345
Term Extension, Percentage	0.08%	0.35%
Commercial And Industrial [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 40	$ 18
Term Extension, Percentage	0.08%	0.03%
Commercial And Industrial [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 164
Term Extension, Percentage		0.32%
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	$ 1	$ 2	2
Term Extension, Percentage	0.01%	0.05%
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 2
Term Extension, Percentage	0.01%	0.04%
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	$ 0
Term Extension, Percentage	0.00%	0.00%
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 1
Term Extension, Percentage		0.17%
Commercial Real Estate Construction - Owner-Occupied [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 1
Term Extension, Percentage		0.17%
Commercial Real Estate Construction - Owner-Occupied [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 0
Term Extension, Percentage		0.00%
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 investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 100		300
Term Extension, Percentage	1.56%
Commercial investor real estate mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 100
Term Extension, Percentage	1.56%
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%
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 40	$ 24	113
Term Extension, Percentage	0.20%	0.13%
Residential First Mortgage [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 39	$ 22
Term Extension, Percentage	0.19%	0.12%
Residential First Mortgage [Member] | Payment Deferral
Financing Receivable, Modifications [Line Items]
Term extension, amount		$ 0
Term Extension, Percentage		0.00%
Residential First Mortgage [Member] | Extended Maturity and Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 2
Term Extension, Percentage	0.01%	0.01%
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 1	4
Term Extension, Percentage	0.03%	0.03%
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
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	$ 1	$ 0
Term Extension, Percentage	0.02%	0.00%
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3	$ 2	$ 9
Term Extension, Percentage	0.12%	0.09%
Home Equity Loan [Member] | Extended Maturity
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 1	$ 1
Term Extension, Percentage	0.04%	0.04%
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	$ 2	$ 1
Term Extension, Percentage	0.08%	0.06%

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

+ Details

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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

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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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Section 55
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

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