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FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on derivatives recognized	$ 20	$ 96
Mark-to-Market
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss on derivative	22
Settlement Losses on Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivative	$ 2

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- Definition

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

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