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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023
Supplier compensation [Line Items] |  |  |
Supplier Proceeds |  | $ 162 | $ 0
Supplier credit memos [Member] |  |  |
Supplier compensation [Line Items] |  |  |
Supplier credit memos | $ 61 |  |

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- Definition Supplier compensation + References No definition available. + Details
Name: | alk_SupplierCompensationLineItems
Namespace Prefix: | alk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Supplier credit memos + References No definition available. + Details
Name: | alk_SupplierCreditMemos
Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Supplier Proceeds + References No definition available. + Details
Name: | alk_SupplierProceeds
Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | alk_SupplierCompensationAxis=alk_SupplierCreditMemosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |