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FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
(Losses) gains on derivatives recognized	$ (21)	$ 89	$ 12	$ 9
Mark-to-Market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivative			21
Settlement Losses on Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on derivative			$ 9