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Comprehensive Income - Differences between Net Income and Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Condensed Statement of Income Captions [Line Items]
NET INCOME	$ 67			$ 193			$ 204	$ 717
Other, net of deferred taxes	2			8			5	7
Total other comprehensive income (loss)	(48)			143			(37)	(143)
COMPREHENSIVE INCOME	19	$ 359	$ (212)	336	$ 544	$ (306)	167	574
Other deferred taxes	0			2			1	6
Fuel derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on fuel derivative instruments, net of deferred taxes	(50)			135			(42)	(150)
Derivative deferred taxes	$ (14)			$ 41			$ (12)	$ (45)

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