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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Operating Revenues |  |  |  |
Total Operating Revenues | $ 1,527 | $ 421 | $ 2,324 | $ 2,057
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 704 | 650 | 1,459 | 2,223
Economic fuel | 274 | 59 | 477 | 443
Total Operating Expenses | 978 | 709 | 1,936 | 2,666
Nonoperating Income (Expense) |  |  |  |
Interest income | 6 | 7 | 13 | 16
Interest expense | (39) | (17) | (71) | (30)
Interest Costs Capitalized | 3 | 1 | 6 | 4
Other | 9 | 6 | 19 | 11
Nonoperating Income (Expense) Total | (21) | (3) | (33) | 1
Income (loss) before income tax | 528 | (291) | 355 | (608)
Costs and Expenses, Total | 978 | 709 | 1,936 | 2,666
Interest Costs Incurred | 39 | 17 | 71 | 30
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,527 | 421 | 2,324 | 2,057
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,234 | 942 | 2,371 | 2,352
Economic fuel | 320 | 65 | 545 | 440
Total Operating Expenses | 1,554 | 1,007 | 2,916 | 2,792
Nonoperating Income (Expense) |  |  |  |
Interest income | 6 | 7 | 13 | 16
Interest expense | (39) | (17) | (71) | (30)
Interest Costs Capitalized | 3 | 1 | 6 | 4
Other | 9 | 6 | 19 | 11
Nonoperating Income (Expense) Total | (21) | (3) | (33) | 1
Income (loss) before income tax | (48) | (589) | (625) | (734)
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,229 | 320 | 1,859 | 1,696
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 984 | 746 | 1,877 | 1,905
Economic fuel | 253 | 45 | 427 | 358
Total Operating Expenses | 1,237 | 791 | 2,304 | 2,263
Nonoperating Income (Expense) |  |  |  |
Interest income | 6 | 11 | 13 | 25
Interest expense | (34) | (18) | (61) | (30)
Interest Costs Capitalized | 3 | 1 | 6 | 4
Other | 9 | 6 | 19 | 12
Nonoperating Income (Expense) Total | (16) | 0 | (23) | 11
Income (loss) before income tax | (24) | (471) | (468) | (556)
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 296 | 101 | 463 | 359
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 286 | 210 | 551 | 479
Economic fuel | 66 | 20 | 118 | 82
Total Operating Expenses | 352 | 230 | 669 | 561
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | (56) | (129) | (206) | (202)
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 111 | 81 | 215 | 186
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 91 | 68 | 179 | 160
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 91 | 68 | 179 | 160
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | (5) | (5) | (10) | (10)
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (5) | (5) | (10) | (10)
Income (loss) before income tax | 15 | 8 | 26 | 16
Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | (109) | (81) | (213) | (184)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (127) | (82) | (236) | (192)
Economic fuel | 1 | 0 | 0 | 0
Total Operating Expenses | (126) | (82) | (236) | (192)
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | (4) | 0 | (9)
Interest expense | 0 | (6) | 0 | (10)
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | (1)
Nonoperating Income (Expense) Total | 0 | 2 | 0 | 0
Income (loss) before income tax | 17 | 3 | 23 | 8
Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (530) | (292) | (912) | (129)
Economic fuel | (46) | (6) | (68) | 3
Total Operating Expenses | (576) | (298) | (980) | (126)
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | 576 | 298 | 980 | 126
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,352 | 309 | 2,011 | 1,790
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,352 | 309 | 2,011 | 1,790
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,072 | 225 | 1,578 | 1,459
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 280 | 84 | 433 | 331
Passenger [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 111 | 81 | 215 | 186
Capacity Purchase Agreements [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | (111) | (81) | (215) | (186)
Capacity Purchase Agreements [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 118 | 73 | 212 | 182
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 118 | 73 | 212 | 182
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 102 | 56 | 182 | 154
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 16 | 17 | 30 | 28
Mileage plan other revenue [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Cargo and Freight [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 57 | 39 | 101 | 85
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 57 | 39 | 101 | 85
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 55 | 39 | 99 | 83
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Cargo and Freight [Member] | Consolidating and Other [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2 | 0 | 2 | 2
Cargo and Freight [Member] | Special Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | $ 0 | $ 0 | $ 0 | $ 0

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