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SHAREHOLDER'S EQUITY (Tables) | 12 Months Ended
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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):
| 2021 |  | 2020
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 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 December 31, 2021 | 1,882,518 |  |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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