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Network
2409403 - Disclosure - EMPLOYEE BENEFIT PLANS - ASSUMPTIONS (Details)
(http://www.alaskaair.com/role/EmployeeBenefitPlansAssumptionsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000766421 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Qualified Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Range [Axis]Range [Axis]Range [Axis]
Minimum [Member]Maximum [Member]Minimum [Member]Maximum [Member]Range [Domain]Minimum [Member]Maximum [Member]Range [Domain]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
 
 
 
 
 
 
 
 
Benefit obligations, Weighted-average discount rate
4.29%  
4.50%  
4.55%  
4.69%  
    
Benefit obligations, Rate of compensation increase
2.12%  
2.59%  
2.06%  
2.65%  
    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
 
 
 
 
 
 
 
 
Net period benefit costs, Weighted-average discount rate
4.55%  
4.69%  
  
4.20%  
  
4.85%  
Net period benefit costs, Weighted-average expected return on assets
6.00%  
6.50%  
  
6.50%  
  
6.75%  
Net period benefit costs, Rate of compensation increase
2.06%  
2.65%  
2.85%  
3.91%  
 
2.90%  
3.93%