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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	$ 160		$ 160		$ 458
Fair value hedging adjustments	(46)		(46)		(56)
Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Designated hedged items	5,300		5,300
Subordinated notes | Other long term debt
Derivative Instruments, Gain (Loss) [Line Items]
Liabilities, Amortized Cost	11,074		11,074		11,589
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	8		8		(223)
Interest rate contracts | Investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Assets, Amortized Cost	8,478		8,478		16,390
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items	(160)		(160)		$ (458)
Interest income available for sale securities taxable | Investment Securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	(40)	$ (295)	(302)	$ (263)
Interest income available for sale securities taxable | Hedged investment securities
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	38	293	299	259
Interest expense subordinated notes and other long term debt | Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	16	301	231	142
Interest expense subordinated notes and other long term debt | Hedged Subordinated notes
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value for derivatives designated as fair value hedges	$ (16)	$ (302)	$ (231)	$ (143)

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