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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Liabilities Activity (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Hawaiian deferred revenue [Member] |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Increase in liability for mileage credits issued | $ 537 | $ 0
Mileage Plan Revenue [Member] |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Total Deferred Revenue balance at January 1 | 2,603 | 2,497
Revenue recognized | 947 | 900
Total Deferred Revenue balance at Sept 30 | 3,192 | 2,599
Passenger revenue [Member] | Mileage Plan Revenue [Member] |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Revenue recognized | (782) | (712)
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member] |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Revenue recognized | $ (113) | $ (86)

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- Definition Change in Contract with Customer, Liability [Roll Forward] + References No definition available. + Details
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- Definition Contract with Customer, Liability, Increase From Issuance of Credits + References No definition available. + Details
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Namespace Prefix: | alk_
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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