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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 3 |
Operating Revenues |  |  |  |
Total Operating Revenues | $ 2,156 | $ 2,102 | $ 3,988 | $ 3,842
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,410 | 1,271 | 2,804 | 2,515
Economic fuel | 475 | 344 | 884 | 683
Total Operating Expenses | 1,885 | 1,615 | 3,688 | 3,198
Nonoperating Income (Expense) |  |  |  |
Interest income | 10 | 9 | 18 | 16
Interest expense | (25) | (26) | (49) | (51)
Interest Costs Capitalized | 4 | 4 | 9 | 8
Other | (1) | 0 | (13) | (1)
Nonoperating Income (Expense) Total | (12) | (13) | (35) | (28)
Income (loss) before income tax | 259 | 474 | 265 | 616
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 2,156 | 2,102 | 3,988 | 3,842
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,371 | 1,247 | 2,734 | 2,452
Economic fuel | 497 | 342 | 919 | 671
Total Operating Expenses | 1,868 | 1,589 | 3,653 | 3,123
Nonoperating Income (Expense) |  |  |  |
Interest income | 10 | 9 | 18 | 16
Interest expense | (25) | (26) | (49) | (51)
Interest Costs Capitalized | 4 | 4 | 9 | 8
Other | (1) | 0 | (13) | (1)
Nonoperating Income (Expense) Total | (12) | (13) | (35) | (28)
Income (loss) before income tax | 276 | 500 | 300 | 691
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 1,859 | 1,823 | 3,438 | 3,327
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,135 | 1,030 | 2,266 | 2,030
Economic fuel | 432 | 304 | 799 | 596
Total Operating Expenses | 1,567 | 1,334 | 3,065 | 2,626
Nonoperating Income (Expense) |  |  |  |
Interest income | 13 | 10 | 24 | 17
Interest expense | (22) | (24) | (44) | (47)
Interest Costs Capitalized | 4 | 3 | 8 | 7
Other | 1 | 0 | (4) | (1)
Nonoperating Income (Expense) Total | (4) | (11) | (16) | (24)
Income (loss) before income tax | 288 | 478 | 357 | 677
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 296 | 278 | 548 | 513
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 249 | 206 | 488 | 406
Economic fuel | 65 | 38 | 120 | 75
Total Operating Expenses | 314 | 244 | 608 | 481
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | (2) | 0 | (9) | 0
Nonoperating Income (Expense) Total | (2) | 0 | (9) | 0
Income (loss) before income tax | (20) | 34 | (69) | 32
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 138 | 109 | 249 | 207
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 123 | 116 | 227 | 219
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 123 | 116 | 227 | 219
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | (5) | (3) | (10) | (5)
Interest Costs Capitalized | 0 | 1 | 1 | 1
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (5) | (2) | (9) | (4)
Income (loss) before income tax | 10 | (9) | 13 | (16)
Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | (137) | (108) | (247) | (205)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (136) | (105) | (247) | (203)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (136) | (105) | (247) | (203)
Nonoperating Income (Expense) |  |  |  |
Interest income | (3) | (1) | (6) | (1)
Interest expense | 2 | 1 | 5 | 1
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (1) | 0 | (1) | 0
Income (loss) before income tax | (2) | (3) | (1) | (2)
Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 39 | 24 | 70 | 63
Economic fuel | (22) | 2 | (35) | 12
Total Operating Expenses | 17 | 26 | 35 | 75
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 | (17) | (26) | (35) | (75)
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,997 | 1,945 | 3,682 | 3,547
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,997 | 1,945 | 3,682 | 3,547
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,711 | 1,677 | 3,153 | 3,052
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 286 | 268 | 529 | 495
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 | 137 | 108 | 247 | 205
Capacity Purchase Agreements [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | (137) | (108) | (247) | (205)
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 | 108 | 109 | 215 | 209
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 108 | 109 | 215 | 209
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 99 | 101 | 197 | 194
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 9 | 8 | 18 | 15
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 | 51 | 48 | 91 | 86
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 51 | 48 | 91 | 86
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 49 | 45 | 88 | 81
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1 | 2 | 1 | 3
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1 | 1 | 2 | 2
Cargo and Freight [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 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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