Comprehensive Income (Loss) - Differences between Net Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Condensed Statement of Income Captions [Line Items]
NET LOSS	$ (159)	$ (278)
Total other comprehensive income (loss)	(147)	503
COMPREHENSIVE INCOME (LOSS)	(306)	225
Fuel derivative contracts
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	(147)	498
Derivative deferred taxes	(44)	151
Interest rate derivatives
Condensed Statement of Income Captions [Line Items]
Unrealized gain (loss) on derivative instruments, net of deferred taxes	0	5
Derivative deferred taxes	$ 0	$ 2