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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Supplier compensation [Line Items] |  |
Supplier Proceeds | $ 162 | $ 0

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

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