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SHAREHOLDER'S EQUITY (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Components of accumulated other comprehensive loss, net of tax (in millions):  
 20212020
Related to marketable securities$(4)$23 
Related to employee benefit plans(252)(498)
Related to interest rate derivatives(6)(19)
 $(262)$(494)
Schedule of Stockholders' Equity Note, Warrants or Rights
Total warrants outstanding are as follows as of December 31, 2021:
Number of shares of ALK common stockStrike Price
PSP 1928,127 31.61
CARES Act loan warrants427,080 31.61
PSP 2305,499 52.25
PSP 3221,812 66.39
Outstanding December 31, 20211,882,518