XML 49 R38.htm IDEA: XBRL DOCUMENT
v3.19.1

LEASES LEASES - NARRATIVE (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) aircraft | Mar. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Operating Leases, Rent Expense |  |  | $ 153
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 3 |
Lessee Operating Lease Lease Not Yet Commenced Amount |  | $ 104 |
Property Subject to Operating Lease [Member] | B-737 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 10 |
Property Subject to Operating Lease [Member] | Airbus [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 61 |
Property Subject to Operating Lease [Member] | Q400 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 9 |
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 32 |
Property Available for Operating Lease [Member] | Airbus [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Optional Additional Units | aircraft |  | 2 |
Property Available for Operating Lease [Member] | E175 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Property Subject to or Available for Operating Lease, Number of Optional Additional Units | aircraft |  | 3 |
Aircraft [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost |  | $ 1 |
Airport Facilities [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Variable Lease, Cost |  | 84 |
Retained Earnings [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 3 |
Minimum [Member] | CPA Aircraft [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  | 8 years |
Maximum [Member] | Aircraft [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  | 11 years |
Maximum [Member] | CPA Aircraft [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract |  | 11 years |
Accounting Standards Update 2016-02 [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 150 |  |

X
- Definition Derecognition of build-to-suit assets and liabilities due to ASU 2016-02 + References No definition available. + Details
Name: | alk_DerecognitionofBuildtosuitAccounting
Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Lessee, Operating Lease, Lease Not Yet Commenced, Amount + References No definition available. + Details
Name: | alk_LesseeOperatingLeaseLeaseNotYetCommencedAmount
Namespace Prefix: | alk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Property Subject to or Available for Operating Lease, Number of Optional Additional Units + References No definition available. + Details
Name: | alk_PropertySubjecttoorAvailableforOperatingLeaseNumberofOptionalAdditionalUnits
Namespace Prefix: | alk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
Name: | us-gaap_VariableLeaseCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=srt_B737Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=alk_AirbusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=alk_Q400Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_AircraftTypeAxis=alk_E175Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertyAvailableForOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | alk_OperatingLeaseTypeAxis=alk_AircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | alk_OperatingLeaseTypeAxis=alk_AirportFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | alk_OperatingLeaseTypeAxis=alk_CPAAircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |