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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (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
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	41	185	347
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	100		300
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	44	27	126
Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		197	451
Current | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		171	162
Current | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount			192
Current | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		26	97
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	14
Financial Asset, 30 to 89 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	0
Financial Asset, 30 to 89 Days Past Due | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount			0
Financial Asset, 30 to 89 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	14
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	8
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount			0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	8
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		15	300
Non-performing [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		14	185
Non-performing [Member] | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount			108
Non-performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		1	7
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	40	182	345
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		169	161
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	0
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		13	184
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	2	2
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		2	1
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		0	1
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		1
Commercial Real Estate Construction - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		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
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		1
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	100		300
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount			192
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount			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
Commercial investor real estate mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount			108
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	40	24	113
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		23	87
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	13
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	8
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		1	5
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	1	4
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		1	4
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	0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 3	2	9
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount		2	6
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount		0	1
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		$ 0	$ 2

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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-Section 50
-Paragraph 33
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

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