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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,658 | $ 1,527 | $ 4,339 | $ 2,324
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,695 | 704 | 3,231 | 1,459
Economic fuel | 776 | 274 | 1,123 | 477
Total Operating Expenses | 2,471 | 978 | 4,354 | 1,936
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 6 | 18 | 13
Interest expense | (26) | (39) | (53) | (71)
Interest capitalized | 3 | 3 | 5 | 6
Other—net | 10 | 9 | 24 | 19
Nonoperating Income (Expense) | (2) | (21) | (6) | (33)
Costs and Expenses, Total | $ 2,471 | $ 978 | $ 4,354 | $ 1,936
Pretax Margin, Adjusted | 14.00% | (3.10%) | 3.10% | (26.90%)
Pretax Margin, GAAP | 7.00% | 34.60% | (0.50%) | 15.30%
Mileage Plan Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 422 | $ 272 | $ 722 | $ 450
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,658 | 1,527 | 4,339 | 2,324
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,549 | 1,234 | 3,010 | 2,371
Economic fuel | 736 | 320 | 1,190 | 545
Total Operating Expenses | 2,285 | 1,554 | 4,200 | 2,916
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | (2) | (21) | (6) | (33)
Income (loss) before income tax | 371 | (48) | 133 | (625)
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,251 | 1,229 | 3,651 | 1,859
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,262 | 984 | 2,456 | 1,877
Economic fuel | 617 | 253 | 998 | 427
Total Operating Expenses | 1,879 | 1,237 | 3,454 | 2,304
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 3 | (16) | 4 | (23)
Income (loss) before income tax | 375 | (24) | 201 | (468)
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 406 | 296 | 686 | 463
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 289 | 286 | 551 | 551
Economic fuel | 119 | 66 | 192 | 118
Total Operating Expenses | 408 | 352 | 743 | 669
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Income (loss) before income tax | (2) | (56) | (57) | (206)
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 101 | 111 | 195 | 215
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 98 | 91 | 197 | 179
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 98 | 91 | 197 | 179
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | (5) | (5) | (10) | (10)
Income (loss) before income tax | (2) | 15 | (12) | 26
Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (100) | (109) | (193) | (213)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (100) | (127) | (194) | (236)
Economic fuel | 0 | 1 | 0 | 0
Total Operating Expenses | (100) | (126) | (194) | (236)
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Income (loss) before income tax | 0 | 17 | 1 | 23
Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 146 | (530) | 221 | (912)
Economic fuel | 40 | (46) | (67) | (68)
Total Operating Expenses | 186 | (576) | 154 | (980)
Nonoperating Income (Expense) |  |  |  |
Nonoperating Income (Expense) | 0 | 0 | 0 | 0
Income (loss) before income tax | (186) | 576 | (154) | 980
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,418 | 1,352 | 3,929 | 2,011
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,418 | 1,352 | 3,929 | 2,011
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,028 | 1,072 | 3,271 | 1,578
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 390 | 280 | 658 | 433
Passenger [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
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
Capacity Purchase Agreements [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 101 | 111 | 195 | 215
Capacity Purchase Agreements [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | (101) | (111) | (195) | (215)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 175 | 118 | 287 | 212
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 175 | 118 | 287 | 212
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 175 | 118 | 287 | 212
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 159 | 102 | 259 | 182
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16 | 16 | 28 | 30
Mileage plan other revenue [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
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
Cargo and Freight [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 65 | 57 | 123 | 101
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 65 | 57 | 123 | 101
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 64 | 55 | 121 | 99
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
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 | 1 | 2 | 2 | 2
Cargo and Freight [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0 | $ 0 | $ 0 | $ 0

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