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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) segment | Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 3 |
Capacity purchase arrangements | 100.00% |  | 100.00% |
Operating revenues |  |  |  |
Passenger, Mainline | $ 1,556 | $ 1,036 | $ 2,828 | $ 1,963
Passenger, Regional | 251 | 227 | 463 | 433
Total passenger revenue | 1,807 | 1,263 | 3,291 | 2,396
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 32 | 27 | 56 | 51
Other - net revenue | 263 | 204 | 504 | 394
Total Operating Revenues | 2,102 | 1,494 | 3,851 | 2,841
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,265 | 875 | 2,509 | 1,765
Economic fuel | 344 | 201 | 683 | 368
Total Operating Expenses | 1,609 | 1,076 | 3,192 | 2,133
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 7 | 16 | 13
Interest expense | (26) | (9) | (51) | (22)
Other | 3 | 4 | 7 | 13
Nonoperating Income (Expense) Total | (14) | 2 | (28) | 4
Income (loss) before income tax | 479 | 420 | 631 | 712
Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,556 | 1,036 | 2,828 | 1,963
Passenger, Regional | 251 | 227 | 463 | 433
Total passenger revenue | 1,807 | 1,263 | 3,291 | 2,396
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 32 | 27 | 56 | 51
Other - net revenue | 263 | 204 | 504 | 394
Total Operating Revenues | 2,102 | 1,494 | 3,851 | 2,841
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,241 | 861 | 2,445 | 1,751
Economic fuel | 342 | 211 | 671 | 380
Total Operating Expenses | 1,583 | 1,072 | 3,116 | 2,131
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 7 | 16 | 13
Interest expense | (26) | (9) | (51) | (22)
Other | 3 | 4 | 7 | 13
Nonoperating Income (Expense) Total | (14) | 2 | (28) | 4
Income (loss) before income tax | 505 | 424 | 707 | 714
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,556 | 1,036 | 2,828 | 1,963
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 1,556 | 1,036 | 2,828 | 1,963
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 31 | 26 | 54 | 49
Other - net revenue | 244 | 184 | 466 | 356
Total Operating Revenues | 1,831 | 1,246 | 3,348 | 2,368
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,026 | 679 | 2,024 | 1,380
Economic fuel | 304 | 180 | 596 | 324
Total Operating Expenses | 1,330 | 859 | 2,620 | 1,704
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 6 | 16 | 12
Interest expense | (23) | (4) | (45) | (16)
Other | 3 | 3 | 6 | 10
Nonoperating Income (Expense) Total | (11) | 5 | (23) | 6
Income (loss) before income tax | 490 | 392 | 705 | 670
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 251 | 227 | 463 | 433
Total passenger revenue | 251 | 227 | 463 | 433
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 1 | 1 | 2 | 2
Other - net revenue | 19 | 19 | 36 | 36
Total Operating Revenues | 271 | 247 | 501 | 471
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 206 | 192 | 406 | 378
Economic fuel | 39 | 31 | 75 | 56
Total Operating Expenses | 245 | 223 | 481 | 434
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | 26 | 24 | 20 | 37
Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | 108 | 110 | 205 | 213
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 1 | 1 | 2 | 2
Total Operating Revenues | 109 | 111 | 207 | 215
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 116 | 101 | 219 | 206
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 116 | 101 | 219 | 206
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 1 | 0 | 1
Interest expense | (3) | (4) | (5) | (5)
Other | 1 | 0 | 1 | 0
Nonoperating Income (Expense) Total | (2) | (3) | (4) | (4)
Income (loss) before income tax | (9) | 7 | (16) | 5
Intersegment Elimination [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | (108) | (110) | (205) | (213)
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | (1) | 0 | 0 | 0
Total Operating Revenues | (109) | (110) | (205) | (213)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (107) | (111) | (204) | (213)
Economic fuel | (1) | 0 | 0 | 0
Total Operating Expenses | (108) | (111) | (204) | (213)
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | (1) | (1) | (1)
Other | (1) | 1 | 0 | 3
Nonoperating Income (Expense) Total | (1) | 0 | (1) | 2
Income (loss) before income tax | (2) | 1 | (2) | 2
Special Revenue and Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 0 | 0 | 0 | 0
Total Operating Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 24 | 14 | 64 | 14
Economic fuel | 2 | (10) | 12 | (12)
Total Operating Expenses | 26 | 4 | 76 | 2
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | $ (26) | $ (4) | $ (76) | $ (2)

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