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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |
Number of operating airlines | segment | 3 |
Operating revenues |  |
Passenger, Mainline | $ 1,272 | $ 927
Passenger, Regional | 212 | 206
Total passenger revenue | 1,484 | 1,133
CPA revenues | 0 | 0
Freight and mail | 24 | 24
Other - net revenue | 241 | 190
Total Operating Revenues | 1,749 | 1,347
Operating expenses |  |
Operating expenses, excluding fuel | 1,244 | 890
Economic fuel | 339 | 167
Total Operating Expenses | 1,583 | 1,057
Nonoperating Income (Expense) |  |
Interest income | 7 | 6
Interest expense | (25) | (13)
Other | 4 | 9
Nonoperating Income (Expense) Total | (14) | 2
Income before income tax | 152 | 292
Air Group Adjusted [Member] |  |
Operating revenues |  |
Passenger, Mainline | 1,272 | 927
Passenger, Regional | 212 | 206
Total passenger revenue | 1,484 | 1,133
CPA revenues | 0 | 0
Freight and mail | 24 | 24
Other - net revenue | 241 | 190
Total Operating Revenues | 1,749 | 1,347
Operating expenses |  |
Operating expenses, excluding fuel | 1,204 | 890
Economic fuel | 329 | 169
Total Operating Expenses | 1,533 | 1,059
Nonoperating Income (Expense) |  |
Interest income | 7 | 6
Interest expense | (25) | (13)
Other | 4 | 9
Nonoperating Income (Expense) Total | (14) | 2
Income before income tax | 202 | 290
Alaska Mainline [Member] |  |
Operating revenues |  |
Passenger, Mainline | 1,272 | 927
Passenger, Regional | 0 | 0
Total passenger revenue | 1,272 | 927
CPA revenues | 0 | 0
Freight and mail | 23 | 23
Other - net revenue | 222 | 172
Total Operating Revenues | 1,517 | 1,122
Operating expenses |  |
Operating expenses, excluding fuel | 998 | 701
Economic fuel | 292 | 144
Total Operating Expenses | 1,290 | 845
Nonoperating Income (Expense) |  |
Interest income | 7 | 6
Interest expense | (22) | (12)
Other | 3 | 7
Nonoperating Income (Expense) Total | (12) | 1
Income before income tax | 215 | 278
Alaska Regional [Member] |  |
Operating revenues |  |
Passenger, Mainline | 0 | 0
Passenger, Regional | 212 | 206
Total passenger revenue | 212 | 206
CPA revenues | 0 | 0
Freight and mail | 1 | 1
Other - net revenue | 17 | 17
Total Operating Revenues | 230 | 224
Operating expenses |  |
Operating expenses, excluding fuel | 200 | 186
Economic fuel | 36 | 25
Total Operating Expenses | 236 | 211
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income before income tax | $ (6) | 13
Horizon [Member] |  |
Segment Reporting Information [Line Items] |  |
Capacity purchase arrangements | 100.00% |
Operating revenues |  |
Passenger, Mainline | $ 0 | 0
Passenger, Regional | 0 | 0
Total passenger revenue | 0 | 0
CPA revenues | 97 | 103
Freight and mail | 0 | 0
Other - net revenue | 1 | 1
Total Operating Revenues | 98 | 104
Operating expenses |  |
Operating expenses, excluding fuel | 103 | 105
Economic fuel | 0 | 0
Total Operating Expenses | 103 | 105
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | (2) | (1)
Other | 0 | 0
Nonoperating Income (Expense) Total | (2) | (1)
Income before income tax | (7) | (2)
Intersegment Elimination [Member] |  |
Operating revenues |  |
Passenger, Mainline | 0 | 0
Passenger, Regional | 0 | 0
Total passenger revenue | 0 | 0
CPA revenues | (97) | (103)
Freight and mail | 0 | 0
Other - net revenue | 1 | 0
Total Operating Revenues | (96) | (103)
Operating expenses |  |
Operating expenses, excluding fuel | (97) | (102)
Economic fuel | 1 | 0
Total Operating Expenses | (96) | (102)
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | (1) | 0
Other | 1 | 2
Nonoperating Income (Expense) Total | 0 | 2
Income before income tax | 0 | 1
Special Revenue and Charges [Member] |  |
Operating revenues |  |
Passenger, Mainline | 0 | 0
Passenger, Regional | 0 | 0
Total passenger revenue | 0 | 0
CPA revenues | 0 | 0
Freight and mail | 0 | 0
Other - net revenue | 0 | 0
Total Operating Revenues | 0 | 0
Operating expenses |  |
Operating expenses, excluding fuel | 40 | 0
Economic fuel | 10 | (2)
Total Operating Expenses | 50 | (2)
Nonoperating Income (Expense) |  |
Interest income | 0 | 0
Interest expense | 0 | 0
Other | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0
Income before income tax | $ (50) | $ 2

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