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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |
Number of Operating Segments | segment | 3 |
Operating Revenues |  |
Passenger revenue | $ 1,685 | $ 1,602
CPA revenues | 0 | 0
Mileage plan other revenue | 107 | 100
Cargo and other | 40 | 38
Total Operating Revenues | 1,832 | 1,740
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,394 | 1,244
Economic fuel | 409 | 339
Total Operating Expenses | 1,803 | 1,583
Nonoperating Income (Expense) |  |
Interest income | 8 | 7
Interest expense | (24) | (25)
Interest Costs Capitalized | 5 | 4
Other | (12) | (1)
Nonoperating Income (Expense) Total | (23) | (15)
Income (loss) before income tax | 6 | 142
Air Group Adjusted [Member] |  |
Operating Revenues |  |
Passenger revenue | 1,685 | 1,602
CPA revenues | 0 | 0
Mileage plan other revenue | 107 | 100
Cargo and other | 40 | 38
Total Operating Revenues | 1,832 | 1,740
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,363 | 1,205
Economic fuel | 422 | 329
Total Operating Expenses | 1,785 | 1,534
Nonoperating Income (Expense) |  |
Interest income | 8 | 7
Interest expense | (24) | (25)
Interest Costs Capitalized | 5 | 4
Other | (12) | (1)
Nonoperating Income (Expense) Total | (23) | (15)
Income (loss) before income tax | 24 | 191
Alaska Mainline [Member] |  |
Operating Revenues |  |
Passenger revenue | 1,442 | 1,375
CPA revenues | 0 | 0
Mileage plan other revenue | 98 | 93
Cargo and other | 39 | 36
Total Operating Revenues | 1,579 | 1,504
Operating expenses |  |
Operating Expenses, Excluding Fuel | 1,131 | 1,000
Economic fuel | 367 | 292
Total Operating Expenses | 1,498 | 1,292
Nonoperating Income (Expense) |  |
Interest income | 11 | 7
Interest expense | (22) | (23)
Interest Costs Capitalized | 4 | 4
Other | (5) | (1)
Nonoperating Income (Expense) Total | (12) | (13)
Income (loss) before income tax | 69 | 199
Alaska Regional [Member] |  |
Operating Revenues |  |
Passenger revenue | 243 | 227
CPA revenues | 0 | 0
Mileage plan other revenue | 9 | 7
Cargo and other | 0 | 1
Total Operating Revenues | 252 | 235
Operating expenses |  |
Operating Expenses, Excluding Fuel | 239 | 200
Economic fuel | 55 | 37
Total Operating Expenses | 294 | 237
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Interest Costs Capitalized | 0 | 0
Other | (7) | 0
Nonoperating Income (Expense) Total | (7) | 0
Income (loss) before income tax | (49) | (2)
Horizon [Member] |  |
Operating Revenues |  |
Passenger revenue | 0 | 0
CPA revenues | 110 | 97
Mileage plan other revenue | 0 | 0
Cargo and other | 1 | 1
Total Operating Revenues | 111 | 98
Operating expenses |  |
Operating Expenses, Excluding Fuel | 104 | 103
Economic fuel | 0 | 0
Total Operating Expenses | 104 | 103
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | (5) | (2)
Interest Costs Capitalized | 1 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | (4) | (2)
Income (loss) before income tax | 3 | (7)
Intersegment Elimination [Member] |  |
Operating Revenues |  |
Passenger revenue | 0 | 0
CPA revenues | (110) | (97)
Mileage plan other revenue | 0 | 0
Cargo and other | 0 | 0
Total Operating Revenues | (110) | (97)
Operating expenses |  |
Operating Expenses, Excluding Fuel | (111) | (98)
Economic fuel | 0 | 0
Total Operating Expenses | (111) | (98)
Nonoperating Income (Expense) |  |
Interest income | (3) | 0
Interest expense | 3 | 0
Interest Costs Capitalized | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income (loss) before income tax | 1 | 1
Special Revenue and Charges [Member] |  |
Operating Revenues |  |
Passenger revenue | 0 | 0
CPA revenues | 0 | 0
Mileage plan other revenue | 0 | 0
Cargo and other | 0 | 0
Total Operating Revenues | 0 | 0
Operating expenses |  |
Operating Expenses, Excluding Fuel | 31 | 39
Economic fuel | (13) | 10
Total Operating Expenses | 18 | 49
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Interest Costs Capitalized | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income (loss) before income tax | $ (18) | $ (49)

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