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Comprehensive Loss - Differences between Net Income and Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Condensed Statement of Income Captions [Line Items]
Net loss	$ (149)	$ (231)
Other, net of deferred taxes	1	2
Total other comprehensive income	1	19
COMPREHENSIVE LOSS	(148)	(212)
Other deferred taxes	0	0
Fuel derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on fuel derivative instruments, net of deferred taxes	0	17
Derivative deferred taxes	$ 0	$ 6

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