OPERATING SEGMENT INFORMATION, ASSETS (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Total assets	$ 14,829	$ 14,186
Alaska Airlines [Member]
Total assets	20,311	19,733
Horizon [Member]
Total assets	1,285	1,157
Consolidating and Other [Member]
Total assets	$ (6,767)	$ (6,704)