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Unusual or Infrequently Occurring Items (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Special items - operating | $ 146 | $ 186 | $ 180 | $ 250
Special items - net non-operating | 0 | (6) | 0 | (6)
Fleet transition - impairment [Member] |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Special items - operating | 41 | 186 | 67 | 199
Labor agreements |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Special items - operating | 30 | 0 | 30 | 51
Integration costs |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Special items - operating | 30 | 0 | 38 | 0
Litigation |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Special items - operating | $ 45 | $ 0 | $ 45 | $ 0

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- Definition Special items - Net non-operating + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Special items - operating + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |