DERIVATIVE FINANCIAL INSTRUMENTS - INTEREST RATE AND FOREIGN CURRENCY DERIVATIVES (Details) $ in Millions, $ in Billions	1 Months Ended	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Apr. 30, 2026 USD ($)	Apr. 30, 2026 MXN ($)	Mar. 31, 2026 MXN ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025
Derivative [Line Items]
Termination of interest rate swaps, net of transaction costs	$ 96	$ 96	$ 0
Disposal Group Held-for-sale | SI Partners
Derivative [Line Items]
Ownership percentage sold	45.00%	45.00%				45.00%		45.00%
Interest rate swaps de-designated
Derivative [Line Items]
Derivative, terminated amount	$ 1,200	$ 1,200
Interest rate swaps | Derivatives not designated as hedging instruments: | Disposal Group Held-for-sale | SI Partners
Derivative [Line Items]
Disposal group, derivative liability	1,952	1,952					$ 3,189
Foreign exchange instruments | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount of derivative	612	612				$ 11.0
Foreign exchange instruments | Derivatives not designated as hedging instruments: | Subsequent Event
Derivative [Line Items]
Notional amount of derivative				$ 155	$ 2.8
Foreign exchange instruments | Derivatives not designated as hedging instruments: | SI Partners
Derivative [Line Items]
Notional amount of derivative						$ 7.5
Foreign exchange instruments | Derivatives not designated as hedging instruments: | SI Partners | Minimum
Derivative [Line Items]
Notional amount of derivative	411	411
Foreign exchange instruments | Derivatives not designated as hedging instruments: | SI Partners | Maximum
Derivative [Line Items]
Notional amount of derivative	422	422
Cash Flow Hedging | Interest rate instruments | Disposal Group Held-for-sale | SI Partners
Derivative [Line Items]
Disposal group, derivative liability	244	244					244
Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Notional amounts	1,461	1,461					2,286
Cash Flow Hedging | Foreign exchange instruments | Disposal Group Held-for-sale | SI Partners
Derivative [Line Items]
Disposal group, derivative liability	$ 122	$ 122					$ 172