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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 380	$ 703
Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	144	375
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	60
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	8
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	233	260
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	254	451
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	73	258
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	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	5
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	180	186
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3	9
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	4
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	2	5
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount		2
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		2
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	257	462
Commercial Portfolio Segment [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	74	262
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	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	5
Commercial Portfolio Segment [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	182	193
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	89	151
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	40	40
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	48
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	49	63
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	91	153
Total Investor Real Estate [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	42	42
Total Investor Real Estate [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	48
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	49	63
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	28	78
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	25	63
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	10
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	3
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	2
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	3
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	3
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	2	7
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	1	5
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	2
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	32	88
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	28	71
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	10
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	3
Consumer Portfolio Segment [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	4
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	2
Commercial Investor Real Estate Construction [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	2	2
Commercial Investor Real Estate Construction [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0	0
Commercial Investor Real Estate Construction [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 Construction [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 0	$ 0

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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