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LOANS AND LEASES - Loan and Lease Portfolio Composition (Details) - USD ($) $ in Millions		Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		$ 137,956		$ 130,042
Allowance for loan and lease losses		(2,374)	$ (2,331)	(2,244)	$ (2,235)	$ (2,304)	$ (2,255)
Net loans and leases	[1]	135,582		127,798
Loans and leases net premium (discount)		(638)		(468)
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		62,978		56,809
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		10,732		11,078
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		5,515		5,454
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		24,502		24,242
Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		15,996		14,564
RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		5,805		5,982
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		2,114		1,771
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		79,225		73,341
Allowance for loan and lease losses		(1,568)	(1,548)	(1,484)	(1,498)	(1,587)	(1,563)
Accrued interest receivable		319		316
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		62,978		56,809
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		10,732		11,078
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		5,515		5,454
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		58,731		56,701
Allowance for loan and lease losses		(806)	$ (783)	(760)	$ (737)	$ (717)	$ (692)
Accrued interest receivable		250		235
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		24,502		24,242
Consumer | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		15,996		14,564
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		10,314		10,142
Consumer | RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		5,805		5,982
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		$ 2,114		$ 1,771
[1] Includes VIE balances in net loans and leases, other assets, long-term debt, and other liabilities of $769 million, $334 million, $694 million, and $123 million, respectively, at September 30, 2025, and $1.1 billion, $264 million, $1.0 billion, and $109 million, respectively, at December 31, 2024. See Note 15 - “Variable Interest Entities” for additional information.

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Amount, before allowance for credit loss, of accrued interest on financing receivable.

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