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LONG-TERM DEBT - LINE OF CREDIT (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) credit_facility
Line of Credit Facility [Line Items] |
Line of Credit Facility, Number of Credit Facilities | credit_facility | 3
Line of Credit Facility, Maximum Borrowing Capacity | $ 475,000,000
Line of Credit Facility, Asset Restrictions | 500,000,000
Credit Facility 1 [Member] | Secured by aircraft [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 250,000,000
Line of Credit Facility, Expiration Date | Jun. 30, 2021
Credit Facility 2 [Member] | Secured by aircraft [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 75,000,000
Line of Credit Facility, Expiration Date | Sep. 30, 2018
Credit Facility 3 [Member] | Secured by certain accounts receivable, spare engines, spare parts and ground service equipment [Member] |
Line of Credit Facility [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 150,000,000
Line of Credit Facility, Expiration Date | Mar. 31, 2022

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- Definition Line of Credit Facility, Asset Restrictions, Unrestricted Cash and Marketable Securities + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line of Credit Facility, Number of Credit Facilities + References No definition available. + Details
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Namespace Prefix: | alk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
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
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Balance Type: |
Period Type: |

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