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Business Combinations and Asset Acquisitions (Details) $ / shares in Units, $ in Billions | Dec. 02, 2023 USD ($) $ / shares
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Business Acquisition, Equity Interests Issued or Issuable [Line Items] |
Business Acquisition, Amount Per Share Paid To Each Holder of Record | $ / shares | $ 18.00
Business Acquisition , Amount Paid To Each Holder Of Record | $ | $ 1

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- Definition Business Acquisition , Amount Paid To Each Holder Of Record + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Business Acquisition, Amount Per Share Paid To Each Holder of Record + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration