SHAREHOLDERS' EQUITY (Tables) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2022

Mar. 31, 2021

Dec. 31, 2021

Dec. 31, 2020

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Components of accumulated other comprehensive loss, net of tax (in millions):

	Marketable Securities		Employee Benefit Plan		Interest Rate Derivatives		Total
Balance at December 31, 2021, net of tax effect of $83	$	(4)	$	(252)	$	(6)	$	(262)
Reclassifications into earnings, net of tax impact of $0	2		1		—		3
Change in value, net of tax impact of $10	(42)		—		9		(33)
Balance at March 31, 2022, net of tax effect of $93	$	(44)	$	(251)	$	3	$	(292)
Balance at December 31, 2020, net of tax effect of $160	$	23	$	(498)	$	(19)	$	(494)
Reclassifications into earnings, net of tax impact of $2	(4)		6		—		(2)
Change in value, net of tax impact of $(2)	(8)		—		6		2
Balance at March 31, 2021, net of tax effect of $160	$	11	$	(492)	$	(13)	$	(494)

Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax

$ 3

$ (2)

Schedule of Stockholders' Equity Note, Warrants or Rights

Total warrants outstanding are as follows as of March 31, 2022:

	Number of shares of ALK common stock	Strike Price
PSP 1	928,127	31.61
CARES Act loan warrants	427,080	31.61
PSP 2	305,499	52.25
PSP 3	221,812	66.39
Outstanding March 31, 2022	1,882,518

Related to marketable securities

$ (292)

$ (494)

$ (262)

$ (494)