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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 887
Defaulted during period where modified in a TDR, twelve months prior to modification	116
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	113
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	561
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	213
Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	593
Current | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	86
Current | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	356
Current | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	151
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	17
Financial Asset, 30 to 89 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	17
Financial Asset, 30 to 89 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	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, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	10
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
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
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	267
Non-performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Non-performing [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	200
Non-performing [Member] | Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	62
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	555
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	355
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	0
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	195
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	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
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
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	2
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3
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	3
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	213
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	151
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	62
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	99
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	75
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	16
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	3
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	5
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	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
Home Equity Lines of Credit[Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	9
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Term extension, amount	6
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Term extension, amount	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
Home Equity Loan [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Term extension, amount	$ 2

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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-Section 50
-Paragraph 42
-Subparagraph (a)(1)
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
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-Section 55
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