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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

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