OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 95	$ 3,072	$ 2,839	$ 8,201	$ 7,873
Operating expenses
Operating Expenses, Excluding Fuel		2,107	1,934	5,900	5,579
Economic fuel		624	694	1,804	1,932
Total Operating Expenses		2,731	2,628	7,704	7,511
Nonoperating Income (Expense)
Interest income		28	23	69	62
Interest expense		(44)	(34)	(115)	(90)
Interest capitalized		7	7	19	21
Other—net		(3)	(6)	(3)	(22)
Nonoperating Income (Expense)		(13)	(18)	(31)	(43)
Costs and Expenses, Total		$ 2,731	$ 2,628	$ 7,704	$ 7,511
Pretax Margin, Adjusted		13.00%	11.40%	8.50%	9.20%
Pretax Margin, GAAP		10.70%	6.80%	5.70%	4.10%
Mileage Plan Revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		$ 460	$ 416	$ 1,336	$ 1,240
Air Group Adjusted [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		3,072	2,839	8,201	7,873
Operating expenses
Operating Expenses, Excluding Fuel		2,033	1,778	5,646	5,173
Economic fuel		628	729	1,826	1,946
Total Operating Expenses		2,661	2,507	7,472	7,119
Nonoperating Income (Expense)
Nonoperating Income (Expense)		(12)	(10)	(30)	(29)
Income (loss) before income tax		399	322	699	725
Alaska Mainline [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,483	2,407	6,740	6,713
Operating expenses
Operating Expenses, Excluding Fuel		1,640	1,484	4,670	4,342
Economic fuel		510	621	1,515	1,672
Total Operating Expenses		2,150	2,105	6,185	6,014
Nonoperating Income (Expense)
Nonoperating Income (Expense)		3	0	6	(3)
Income (loss) before income tax		336	302	561	696
Horizon [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		491	430	1,358	1,154
Operating expenses
Operating Expenses, Excluding Fuel		325	297	946	832
Economic fuel		95	108	288	274
Total Operating Expenses		420	405	1,234	1,106
Nonoperating Income (Expense)
Nonoperating Income (Expense)		0	0	0	0
Income (loss) before income tax		71	25	124	48
Consolidating and Other [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		3	2	8	6
Operating expenses
Operating Expenses, Excluding Fuel		(14)	(3)	(52)	(1)
Economic fuel		0	0	0	0
Total Operating Expenses		(14)	(3)	(52)	(1)
Nonoperating Income (Expense)
Nonoperating Income (Expense)		(11)	(10)	(32)	(26)
Income (loss) before income tax		6	(5)	28	(19)
Special Charges [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Operating expenses
Operating Expenses, Excluding Fuel		74	156	254	406
Economic fuel		(4)	(35)	(22)	(14)
Total Operating Expenses		70	121	232	392
Nonoperating Income (Expense)
Nonoperating Income (Expense)		(1)	(8)	(1)	(14)
Income (loss) before income tax		(71)	(129)	(233)	(406)
Hawaiian Airlines
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax			0	95	0
Operating expenses
Operating Expenses, Excluding Fuel		82	0	82	0
Economic fuel		23	0	23	0
Total Operating Expenses		105	0	105	0
Nonoperating Income (Expense)
Nonoperating Income (Expense)		(4)	0	(4)	0
Income (loss) before income tax		(14)	0	(14)	0
Passenger [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,821	2,618	7,476	7,200
Passenger [Member] | Air Group Adjusted [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,821	2,618	7,476	7,200
Passenger [Member] | Alaska Mainline [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,261	2,201	6,078	6,082
Passenger [Member] | Horizon [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		476	417	1,314	1,118
Passenger [Member] | Consolidating and Other [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Passenger [Member] | Special Charges [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Passenger [Member] | Hawaiian Airlines
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		84	0	84	0
Mileage plan other revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		171	159	509	483
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		171	159	509	483
Mileage plan other revenue [Member] | Air Group Adjusted [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		171	159	509	483
Mileage plan other revenue [Member] | Alaska Mainline [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		151	146	460	447
Mileage plan other revenue [Member] | Horizon [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		15	13	44	36
Mileage plan other revenue [Member] | Consolidating and Other [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Mileage plan other revenue [Member] | Special Charges [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Mileage plan other revenue [Member] | Hawaiian Airlines
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		5	0	5	0
Cargo and Freight [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		80	62	216	190
Cargo and Freight [Member] | Air Group Adjusted [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		80	62	216	190
Cargo and Freight [Member] | Alaska Mainline [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		71	60	202	184
Cargo and Freight [Member] | Horizon [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Cargo and Freight [Member] | Consolidating and Other [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		3	2	8	6
Cargo and Freight [Member] | Special Charges [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		0	0	0	0
Cargo and Freight [Member] | Hawaiian Airlines
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax		$ 6	$ 0	$ 6	$ 0