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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES NARRATIVE (Details) - Accounting Standards Update 2014-09 [Member] - Scenario, Forecast [Member] $ in Millions | Jan. 01, 2018 USD ($)
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Minimum [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Amount of increase to the liability for earned miles | $ 350
Amount of decrease to air traffic liability | 80
Overall impact on equity | 170
Maximum [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Amount of increase to the liability for earned miles | 450
Amount of decrease to air traffic liability | 90
Overall impact on equity | $ 250

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- Definition Contract with Customer, Air Traffic Liability + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with Customer, Liability + References No definition available. + Details
Name: | alk_ContractwithCustomerLiability
Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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