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DEBT - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jul. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Jul. 07, 2025
Debt Instrument [Line Items]
Unamortized debt discount		$ (130)
Voluntarily prepayment of outstanding principal balance of debt		4,196	$ 8,792
Secured Debt | MileagePlus Notes
Debt Instrument [Line Items]
Redemption of aggregate principal amount of outstanding debt				$ 1,520
Stated interest rate				6.50%
Secured Debt | Term Loan Facility
Debt Instrument [Line Items]
Voluntarily prepayment of outstanding principal balance of debt	$ 1,800
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Undrawn and available amount under revolving credit facility		$ 3,000

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