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Financial Liability, Closed Portfolio, Portfolio Layer Method, Amortized Cost

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Hedged Liability, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease)

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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.

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- Definition

Amount of asset hedged in portfolio layer hedging relationship, expected to be remaining at end of hedging relationship.

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, in portfolio layer hedging relationship.

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- Definition

Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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- Definition

Amortized cost of closed portfolio of financial asset used to designate hedging relationship in which hedged item is expected to be outstanding for designated hedged period.

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	$ 515		$ 515		$ 177
Fair value hedging adjustments	(32)		(32)		(42)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged items	5,600		5,600
Subordinated notes \| Other long term debt
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities, Amortized Cost	10,939		10,939		11,066
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	(391)		(391)		1
Interest rate contracts \| Investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Assets, Amortized Cost	14,724		14,724		11,402
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	(515)		(515)		$ (177)
Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpenseOtherLongTermDebt \| Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	(218)	$ 16	(391)	$ 231
Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpenseOtherLongTermDebt \| Hedged Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	218	(16)	392	(231)
Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeSecuritiesTaxable \| Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	293	(40)	342	(302)
Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeSecuritiesTaxable \| Hedged investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	$ (293)	$ 38	$ (338)	$ 299