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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 3 |
Operating Revenues |  |  |  |
Total Operating Revenues | $ 2,389 | $ 2,212 | $ 6,553 | $ 6,200
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,481 | 1,402 | 4,334 | 4,206
Economic fuel | 486 | 513 | 1,408 | 1,397
Total Operating Expenses | 1,967 | 1,915 | 5,742 | 5,603
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 11 | 31 | 29
Interest expense | (18) | (22) | (60) | (71)
Interest Costs Capitalized | 4 | 5 | 11 | 14
Other | (3) | (7) | (20) | (20)
Nonoperating Income (Expense) Total | (6) | (13) | (38) | (48)
Income (loss) before income tax | 416 | 284 | 773 | 549
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 2,389 | 2,212 | 6,553 | 6,200
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,476 | 1,380 | 4,295 | 4,114
Economic fuel | 486 | 508 | 1,409 | 1,427
Total Operating Expenses | 1,962 | 1,888 | 5,704 | 5,541
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 11 | 31 | 29
Interest expense | (18) | (22) | (60) | (71)
Interest Costs Capitalized | 4 | 5 | 11 | 14
Other | (3) | (7) | (20) | (20)
Nonoperating Income (Expense) Total | (6) | (13) | (38) | (48)
Income (loss) before income tax | 421 | 311 | 811 | 611
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 2,015 | 1,884 | 5,514 | 5,322
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,226 | 1,126 | 3,545 | 3,392
Economic fuel | 411 | 438 | 1,191 | 1,237
Total Operating Expenses | 1,637 | 1,564 | 4,736 | 4,629
Nonoperating Income (Expense) |  |  |  |
Interest income | 17 | 15 | 50 | 39
Interest expense | (18) | (20) | (58) | (64)
Interest Costs Capitalized | 4 | 4 | 11 | 12
Other | (3) | (5) | (20) | (9)
Nonoperating Income (Expense) Total | 0 | (6) | (17) | (22)
Income (loss) before income tax | 378 | 314 | 761 | 671
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 373 | 326 | 1,035 | 874
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 275 | 267 | 817 | 755
Economic fuel | 75 | 70 | 218 | 190
Total Operating Expenses | 350 | 337 | 1,035 | 945
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | (2) | 0 | (11)
Nonoperating Income (Expense) Total | 0 | (2) | 0 | (11)
Income (loss) before income tax | 23 | (13) | 0 | (82)
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 112 | 130 | 341 | 379
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 94 | 118 | 286 | 345
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 94 | 118 | 286 | 345
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | (7) | (6) | (22) | (16)
Interest Costs Capitalized | 0 | 1 | 0 | 2
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (7) | (5) | (22) | (14)
Income (loss) before income tax | 11 | 7 | 33 | 20
Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | (111) | (128) | (337) | (375)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (119) | (131) | (353) | (378)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (119) | (131) | (353) | (378)
Nonoperating Income (Expense) |  |  |  |
Interest income | (6) | (4) | (19) | (10)
Interest expense | 7 | 4 | 20 | 9
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 1 | 0 | 1 | (1)
Income (loss) before income tax | 9 | 3 | 17 | 2
Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 5 | 22 | 39 | 92
Economic fuel | 0 | 5 | (1) | (30)
Total Operating Expenses | 5 | 27 | 38 | 62
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 | (5) | (27) | (38) | (62)
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2,211 | 2,043 | 6,038 | 5,724
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2,211 | 2,043 | 6,038 | 5,724
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,850 | 1,727 | 5,039 | 4,879
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 361 | 316 | 999 | 845
Passenger [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Special Revenue and 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 | 112 | 128 | 340 | 375
Capacity Purchase Agreements [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | (112) | (128) | (340) | (375)
Capacity Purchase Agreements [Member] | Special Revenue and 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 | 114 | 346 | 329
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 118 | 114 | 346 | 329
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 107 | 104 | 312 | 301
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 11 | 10 | 34 | 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] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Special Revenue and 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 | 60 | 55 | 169 | 147
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 60 | 55 | 169 | 147
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 58 | 53 | 163 | 142
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1 | 0 | 2 | 1
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 2 | 1 | 4
Cargo and Freight [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1 | 0 | 3 | 0
Cargo and Freight [Member] | Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | $ 0 | $ 0 | $ 0 | $ 0

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