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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) airline | Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Airlines | airline |  |  | 2 |
Number of Operating Segments | airline |  |  | 3 |
Operating revenues |  |  |  |
Passenger, Mainline | $ 1,036 | $ 1,019 | $ 1,963 | $ 1,920
Passenger, Regional | 227 | 212 | 433 | 398
Total passenger revenue | 1,263 | 1,231 | 2,396 | 2,318
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 27 | 30 | 51 | 53
Other - net revenue | 204 | 176 | 394 | 335
Total Operating Revenues | 1,494 | 1,437 | 2,841 | 2,706
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 875 | 804 | 1,765 | 1,600
Economic fuel | 201 | 261 | 368 | 496
Total Operating Expenses | 1,076 | 1,065 | 2,133 | 2,096
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 6 | 13 | 11
Interest expense | (9) | (11) | (22) | (22)
Other | 4 | 9 | 13 | 17
Nonoperating Income (Expense) Total | 2 | 4 | 4 | 6
Income before income tax | 420 | 376 | $ 712 | 616
Air Group Adjusted [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of Airlines | airline |  |  | 2 |
Operating revenues |  |  |  |
Passenger, Mainline | 1,036 | 1,019 | $ 1,963 | 1,920
Passenger, Regional | 227 | 212 | 433 | 398
Total passenger revenue | 1,263 | 1,231 | 2,396 | 2,318
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 27 | 30 | 51 | 53
Other - net revenue | 204 | 176 | 394 | 335
Total Operating Revenues | 1,494 | 1,437 | 2,841 | 2,706
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 861 | 804 | 1,751 | 1,600
Economic fuel | 211 | 267 | 380 | 502
Total Operating Expenses | 1,072 | 1,071 | 2,131 | 2,102
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 6 | 13 | 11
Interest expense | (9) | (11) | (22) | (22)
Other | 4 | 9 | 13 | 17
Nonoperating Income (Expense) Total | 2 | 4 | 4 | 6
Income before income tax | 424 | 370 | 714 | 610
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,036 | 1,019 | 1,963 | 1,920
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 1,036 | 1,019 | 1,963 | 1,920
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 26 | 28 | 49 | 50
Other - net revenue | 184 | 156 | 356 | 298
Total Operating Revenues | 1,246 | 1,203 | 2,368 | 2,268
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 679 | 645 | 1,380 | 1,284
Economic fuel | 180 | 232 | 324 | 436
Total Operating Expenses | 859 | 877 | 1,704 | 1,720
Nonoperating Income (Expense) |  |  |  |
Interest income | 6 | 5 | 12 | 10
Interest expense | (4) | (7) | (16) | (14)
Other | 3 | 7 | 10 | 14
Nonoperating Income (Expense) Total | 5 | 5 | 6 | 10
Income before income tax | 392 | 331 | 670 | 558
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 227 | 212 | 433 | 398
Total passenger revenue | 227 | 212 | 433 | 398
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 1 | 2 | 2 | 3
Other - net revenue | 19 | 19 | 36 | 35
Total Operating Revenues | 247 | 233 | 471 | 436
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 192 | 169 | 378 | 333
Economic fuel | 31 | 35 | 56 | 66
Total Operating Expenses | 223 | 204 | 434 | 399
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 before income tax | $ 24 | 29 | $ 37 | 37
Horizon [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capacity purchase arrangements | 100.00% |  | 100.00% |
Operating revenues |  |  |  |
Passenger, Mainline | $ 0 | 0 | $ 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | 110 | 99 | 213 | 198
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 1 | 1 | 2 | 2
Total Operating Revenues | 111 | 100 | 215 | 200
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 101 | 90 | 206 | 181
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 101 | 90 | 206 | 181
Nonoperating Income (Expense) |  |  |  |
Interest income | 1 | 0 | 1 | 0
Interest expense | (4) | (1) | (5) | (5)
Other | 0 | (1) | 0 | 0
Nonoperating Income (Expense) Total | (3) | (2) | (4) | (5)
Income before income tax | 7 | 8 | 5 | 14
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 | (110) | (99) | (213) | (198)
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 0 | 0 | 0 | 0
Total Operating Revenues | (110) | (99) | (213) | (198)
Operating expenses |  |  |  |
Operating expenses, excluding fuel | (111) | (100) | (213) | (198)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (111) | (100) | (213) | (198)
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 1 | 0 | 1
Interest expense | (1) | (3) | (1) | (3)
Other | 1 | 3 | 3 | 3
Nonoperating Income (Expense) Total | 0 | 1 | 2 | 1
Income before income tax | 1 | 2 | 2 | 1
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 | 14 | 0 | 14 | 0
Economic fuel | (10) | (6) | (12) | (6)
Total Operating Expenses | 4 | (6) | 2 | (6)
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 before income tax | $ (4) | $ 6 | $ (2) | $ 6

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