DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Gains/(Losses) by Hedge Designation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	$ (125)	$ (36)	$ (60)	$ (351)
Interest rate contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	0	(153)	(63)	(102)
Interest rate contracts | Fair value hedges | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net interest settlements and accruals on hedging instruments	(45)	(92)	(137)	(294)
Fair value changes on hedging instruments	34	585	598	316
Fair value changes on hedged debt	(33)	(553)	(576)	(316)
Interest rate contracts | Cross-currency interest rate swap contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net interest settlements and accruals on hedging instruments	(23)	(33)	(66)	(97)
Fair value changes on hedging instruments	(14)	266	490	155
Fair value changes on hedged debt	(1)	(261)	(476)	(159)
Foreign currency exchange contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	6	(5)	(129)	132
Cross-currency interest rate swap contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	$ (49)	$ 210	$ 299	$ 14