OPERATING SEGMENT INFORMATION, ASSETS (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Total assets	$ 6,061		$ 5,838
Alaska Airlines [Member]
Total assets	6,124	[1]	5,832	[1]
Horizon [Member]
Total assets	849		840
Parent [Member]
Total assets	2,913		2,762
Intersegment Elimination [Member]
Total assets	$ (3,825)		$ (3,596)

[1] There are no assets associated with purchased capacity flying at Alaska.