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, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	$ 123	$ (125)	$ 161	$ (60)
Interest rate contracts \| Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	173	0	265	(63)
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	0	(45)	(14)	(137)
Fair value changes on hedging instruments	(861)	34	(1,226)	598
Fair value changes on hedged debt	832	(33)	1,188	(576)
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	(15)	(23)	(41)	(66)
Fair value changes on hedging instruments	(193)	(14)	(433)	490
Fair value changes on hedged debt	189	(1)	422	(476)
Foreign currency exchange contracts \| Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments	43	6	119	(129)
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	$ (45)	$ (49)	$ (119)	$ 299

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Loss relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

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