v3.19.2
COVER - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Cover page.    
Document Type 10-Q  
Document Transition Report false  
Document Period End Date Jun. 30, 2019  
Document Quarterly Report true  
Entity File Number 1-8957  
Entity Registrant Name ALASKA AIR GROUP, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 91-1292054  
Title of 12(b) Security Common stock, $0.01 par value  
Security Exchange Name NYSE  
Trading Symbol ALK  
Entity Address, Address Line One 19300 International Boulevard,  
Entity Address, City or Town Seattle,  
Entity Address, State or Province WA  
Entity Address, Postal Zip Code 98188  
City Area Code (206)  
Local Phone Number 392-5040  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   123,272,253
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0000766421  
Current Fiscal Year End Date --12-31