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OPERATING SEGMENT INFORMATION, ASSETS (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total assets $ 6,410us-gaap_Assets $ 6,181us-gaap_Assets
Alaska Airlines [Member]    
Total assets 7,153us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= alk_AlaskaAirlinesMember		 6,772us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= alk_AlaskaAirlinesMember
Horizon [Member]    
Total assets 821us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= alk_HorizonMember		 818us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= alk_HorizonMember
Parent [Member]    
Total assets 3,638us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember		 3,552us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Intersegment Elimination [Member]    
Total assets $ (5,202)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember		 $ (4,961)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember