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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) airline | Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Airlines | airline |  |  | 2 |
Number of Operating Segments | airline |  |  | 3 |
Operating revenues |  |  |  |
Passenger, Mainline | $ 1,073 | $ 1,057 | $ 3,036 | $ 2,977
Passenger, Regional | 249 | 240 | 682 | 638
Total passenger revenue | 1,322 | 1,297 | 3,718 | 3,615
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 31 | 30 | 82 | 83
Other - net revenue | 213 | 188 | 607 | 523
Total Operating Revenues | 1,566 | 1,515 | 4,407 | 4,221
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 941 | 837 | 2,706 | 2,437
Economic fuel | 225 | 245 | 593 | 741
Total Operating Expenses | 1,166 | 1,082 | 3,299 | 3,178
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 5 | 20 | 16
Interest expense | (11) | (10) | (33) | (32)
Other | 6 | 9 | 19 | 26
Nonoperating Income (Expense) Total | 2 | 4 | 6 | 10
Income before income tax | 402 | 437 | $ 1,114 | 1,053
Air Group Adjusted [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of Airlines | airline |  |  | 2 |
Operating revenues |  |  |  |
Passenger, Mainline | 1,073 | 1,057 | $ 3,036 | 2,977
Passenger, Regional | 249 | 240 | 682 | 638
Total passenger revenue | 1,322 | 1,297 | 3,718 | 3,615
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 31 | 30 | 82 | 83
Other - net revenue | 213 | 188 | 607 | 523
Total Operating Revenues | 1,566 | 1,515 | 4,407 | 4,221
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 919 | 837 | 2,670 | 2,437
Economic fuel | 222 | 240 | 602 | 742
Total Operating Expenses | 1,141 | 1,077 | 3,272 | 3,179
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 5 | 20 | 16
Interest expense | (11) | (10) | (33) | (32)
Other | 6 | 9 | 19 | 26
Nonoperating Income (Expense) Total | 2 | 4 | 6 | 10
Income before income tax | 427 | 442 | 1,141 | 1,052
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,073 | 1,057 | 3,036 | 2,977
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 1,073 | 1,057 | 3,036 | 2,977
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 30 | 29 | 79 | 79
Other - net revenue | 190 | 167 | 546 | 465
Total Operating Revenues | 1,293 | 1,253 | 3,661 | 3,521
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 727 | 667 | 2,107 | 1,951
Economic fuel | 188 | 205 | 512 | 641
Total Operating Expenses | 915 | 872 | 2,619 | 2,592
Nonoperating Income (Expense) |  |  |  |
Interest income | 7 | 5 | 19 | 15
Interest expense | (7) | (7) | (23) | (21)
Other | 5 | 7 | 15 | 21
Nonoperating Income (Expense) Total | 5 | 5 | 11 | 15
Income before income tax | 383 | 386 | 1,053 | 944
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 249 | 240 | 682 | 638
Total passenger revenue | 249 | 240 | 682 | 638
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 1 | 1 | 3 | 4
Other - net revenue | 21 | 20 | 57 | 55
Total Operating Revenues | 271 | 261 | 742 | 697
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 202 | 181 | 580 | 514
Economic fuel | 34 | 35 | 90 | 101
Total Operating Expenses | 236 | 216 | 670 | 615
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 | $ 35 | 45 | $ 72 | 82
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 | 109 | 105 | 322 | 303
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 1 | 1 | 3 | 3
Total Operating Revenues | 110 | 106 | 325 | 306
Operating expenses |  |  |  |
Operating expenses, excluding fuel | 99 | 93 | 305 | 274
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 99 | 93 | 305 | 274
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 1 | 0
Interest expense | (2) | (3) | (7) | (8)
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (2) | (3) | (6) | (8)
Income before income tax | 9 | 10 | 14 | 24
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 | (109) | (105) | (322) | (303)
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 1 | 0 | 1 | 0
Total Operating Revenues | (108) | (105) | (321) | (303)
Operating expenses |  |  |  |
Operating expenses, excluding fuel | (109) | (104) | (322) | (302)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (109) | (104) | (322) | (302)
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 1
Interest expense | (2) | 0 | (3) | (3)
Other | 1 | 2 | 4 | 5
Nonoperating Income (Expense) Total | (1) | 2 | 1 | 3
Income before income tax | 0 | 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 | 22 | 0 | 36 | 0
Economic fuel | 3 | 5 | 9 | 1
Total Operating Expenses | 25 | 5 | 27 | (1)
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 | $ (25) | $ (5) | $ (27) | $ 1

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