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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,232 | $ 2,196
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,833 | 1,717
Economic fuel | 565 | 665
Total Operating Expenses | 2,398 | 2,382
Nonoperating Income (Expense) |  |
Interest income | 17 | 17
Interest expense | (35) | (28)
Interest capitalized | 6 | 7
Other—net | 0 | (9)
Nonoperating Income (Expense) | (12) | (13)
Costs and Expenses, Total | $ 2,398 | $ 2,382
Pretax Margin, Adjusted | (7.00%) | (5.20%)
Pretax Margin, GAAP | (8.00%) | (9.10%)
Mileage Plan Revenue [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 412 | $ 386
Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,232 | 2,196
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,799 | 1,653
Economic fuel | 578 | 645
Total Operating Expenses | 2,377 | 2,298
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | (12) | (13)
Income (loss) before income tax | (157) | (115)
Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,840 | 1,873
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,514 | 1,390
Economic fuel | 485 | 561
Total Operating Expenses | 1,999 | 1,951
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | (3) | (6)
Income (loss) before income tax | (162) | (84)
Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 390 | 322
Operating expenses |  |
Operating Expenses, Excluding Fuel | 299 | 256
Economic fuel | 93 | 85
Total Operating Expenses | 392 | 341
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | 0 | 0
Income (loss) before income tax | (2) | (19)
Horizon [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 104 | 78
Operating expenses |  |
Operating Expenses, Excluding Fuel | 88 | 84
Economic fuel | 0 | 0
Total Operating Expenses | 88 | 84
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | (11) | (8)
Income (loss) before income tax | 5 | (14)
Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (102) | (77)
Operating expenses |  |
Operating Expenses, Excluding Fuel | (102) | (77)
Economic fuel | 0 | (1)
Total Operating Expenses | (102) | (78)
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | 2 | 1
Income (loss) before income tax | 2 | 2
Special Charges [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Operating expenses |  |
Operating Expenses, Excluding Fuel | 34 | 64
Economic fuel | (13) | 20
Total Operating Expenses | 21 | 84
Nonoperating Income (Expense) |  |
Nonoperating Income (Expense) | 0 | 0
Income (loss) before income tax | (21) | (84)
Passenger [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,004 | 1,984
Passenger [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,004 | 1,984
Passenger [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,629 | 1,673
Passenger [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 375 | 311
Passenger [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Passenger [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Passenger [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Capacity Purchase Agreements [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 104 | 78
Capacity Purchase Agreements [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (104) | (78)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Mileage plan other revenue [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 164 | 154
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 164 | 154
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 164 | 154
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 149 | 143
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 15 | 11
Mileage plan other revenue [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Mileage plan other revenue [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Mileage plan other revenue [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Cargo and Freight [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 64 | 58
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 64 | 58
Cargo and Freight [Member] | Alaska Mainline [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 62 | 57
Cargo and Freight [Member] | Alaska Regional [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Cargo and Freight [Member] | Horizon [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0
Cargo and Freight [Member] | Consolidating and Other [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2 | 1
Cargo and Freight [Member] | Special Charges [Member] |  |
Operating Revenues |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0 | $ 0

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