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SHAREHOLDERS' EQUITY (Tables)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) Components of accumulated other comprehensive loss, net of tax (in millions):
September 30, 2021December 31, 2020
Related to marketable securities$7 $23 
Related to employee benefit plans(479)(498)
Related to interest rate derivatives(10)(19)
Total$(482)$(494)
Schedule of Stockholders' Equity Note, Warrants or Rights Total warrants outstanding are as follows as of September 30, 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
Total1,882,518