Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income (loss)	$ 977	$ (3,074)	$ 2,300
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of $25, ($15), and ($9)	84	(48)	(29)
Other, net of deferred taxes of ($13), $7, and $8	(47)	25	26
OTHER COMPREHENSIVE INCOME (LOSS)	513	(44)	(81)
COMPREHENSIVE INCOME (LOSS)	1,490	(3,118)	2,219
Fuel derivative contracts
Unrealized gain (loss) on derivatives, net of tax	469	4	(53)
Interest rate derivatives
Unrealized gain (loss) on derivatives, net of tax	$ 7	$ (25)	$ (25)