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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) airline segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of operating airlines | airline |  | 2 |  |
Number of operating segments | segment |  | 3 |  |
Operating revenues |  |  |  |
Passenger, Mainline |  | $ 3,939 | $ 3,774 | $ 3,490
Passenger, Regional |  | 854 | 805 | 777
Total passenger revenue |  | 4,793 | 4,579 | 4,267
CPA revenues |  | 0 | 0 | 0
Freight and mail |  | 108 | 114 | 113
Other Net and Special Revenue |  | 697 | 675 | 776
Total Operating Revenues |  | 5,598 | 5,368 | 5,156
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 3,346 | 2,988 | 2,851
Economic fuel |  | 954 | 1,418 | 1,467
Total Operating Expenses |  | 4,300 | 4,406 | 4,318
Nonoperating income (expense) |  |  |  |
Interest income |  | 21 | 21 | 18
Interest expense |  | (42) | (48) | (56)
Other |  | 35 | 40 | 16
Nonoperating Income (Expense) Total |  | 14 | 13 | (22)
Income (loss) before income tax |  | 1,312 | 975 | 816
Income before income tax |  |  | 975 | 816
Depreciation |  | 320 | 294 | 270
Capital expenditures |  | 831 | 694 | 566
Total assets |  | 6,533 | 6,064 |
Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | [1] | 3,939 | 3,774 | 3,490
Passenger, Regional | [1] | 854 | 805 | 777
Total passenger revenue | [1] | 4,793 | 4,579 | 4,267
CPA revenues | [1] | 0 | 0 | 0
Freight and mail | [1] | 108 | 114 | 113
Other Net and Special Revenue | [1] | 697 | 675 | 584
Total Operating Revenues | [1] | 5,598 | 5,368 | 4,964
Operating expenses |  |  |  |
Operating expenses, excluding fuel | [1] | 3,314 | 3,018 | 2,851
Economic fuel | [1] | 954 | 1,441 | 1,475
Total Operating Expenses | [1] | 4,268 | 4,459 | 4,326
Nonoperating income (expense) |  |  |  |
Interest income | [1] | 21 | 21 | 18
Interest expense | [1] | (42) | (48) | (56)
Other | [1] | 35 | 40 | 16
Nonoperating Income (Expense) Total | [1] | 14 | 13 | (22)
Income (loss) before income tax | [1] | 1,344 | 922 | 616
Alaska Airlines [Member] |  |  |  |
Nonoperating income (expense) |  |  |  |
Depreciation | [2] | 268 | 243 | 223
Capital expenditures | [2] | 821 | 659 | 494
Total assets | [2] | 8,129 | 6,665 |
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline |  | 3,939 | 3,774 | 3,490
Passenger, Regional |  | 0 | 0 | 0
Total passenger revenue |  | 3,939 | 3,774 | 3,490
CPA revenues |  | 0 | 0 | 0
Freight and mail |  | 103 | 109 | 109
Other Net and Special Revenue |  | 621 | 592 | 513
Total Operating Revenues |  | 4,663 | 4,475 | 4,112
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 2,653 | 2,417 | 2,293
Economic fuel |  | 823 | 1,251 | 1,294
Total Operating Expenses |  | 3,476 | 3,668 | 3,587
Nonoperating income (expense) |  |  |  |
Interest income |  | 19 | 20 | 18
Interest expense |  | (28) | (32) | (38)
Other |  | 28 | 39 | 25
Nonoperating Income (Expense) Total |  | 19 | 27 | 5
Income (loss) before income tax |  | 1,206 | 834 | 530
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline |  | 0 | 0 | 0
Passenger, Regional |  | 854 | 805 | 777
Total passenger revenue |  | 854 | 805 | 777
CPA revenues |  | 0 | 0 | 0
Freight and mail |  | 5 | 5 | 4
Other Net and Special Revenue |  | 72 | 78 | 66
Total Operating Revenues |  | 931 | 888 | 847
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 695 | 623 | 585
Economic fuel |  | 131 | 190 | 181
Total Operating Expenses |  | 826 | 813 | 766
Nonoperating income (expense) |  |  |  |
Interest income |  | 0 | 0 | 0
Interest expense |  | 0 | 0 | 0
Other |  | 0 | (1) | (12)
Nonoperating Income (Expense) Total |  | 0 | (1) | (12)
Income (loss) before income tax |  | 105 | 74 | 69
Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline |  | 0 | 0 | 0
Passenger, Regional |  | 0 | 0 | 0
Total passenger revenue |  | 0 | 0 | 0
CPA revenues |  | 408 | 371 | 368
Freight and mail |  | 0 | 0 | 0
Other Net and Special Revenue |  | 4 | 5 | 5
Total Operating Revenues |  | 412 | 376 | 373
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | 375 | 349 | 341
Economic fuel |  | 0 | 0 | 0
Total Operating Expenses |  | 375 | 349 | 341
Nonoperating income (expense) |  |  |  |
Interest income |  | 0 | 0 | 0
Interest expense |  | (10) | (12) | (14)
Other |  | 1 | 2 | 2
Nonoperating Income (Expense) Total |  | (9) | (10) | (12)
Income (loss) before income tax |  | 28 | 17 | 20
Depreciation |  | 52 | 51 | 47
Capital expenditures |  | 10 | 35 | 72
Total assets |  | 718 | 809 |
Parent [Member] |  |  |  |
Nonoperating income (expense) |  |  |  |
Depreciation |  | 0 | 0 | 0
Total assets |  | 4,734 | 3,551 |
Intersegment Eliminations |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline |  | 0 | 0 | 0
Passenger, Regional |  | 0 | 0 | 0
Total passenger revenue |  | 0 | 0 | 0
CPA revenues |  | (408) | $ (371) | (368)
Freight and mail |  | 0 |  | 0
Other Net and Special Revenue |  | 0 |  | 0
Total Operating Revenues |  | (408) | $ (371) | (368)
Operating expenses |  |  |  |
Operating expenses, excluding fuel |  | (409) | (371) | (368)
Economic fuel |  | 0 | 0 | 0
Total Operating Expenses |  | (409) | (371) | (368)
Nonoperating income (expense) |  |  |  |
Interest income |  | 2 | 1 | 0
Interest expense |  | (4) | (4) | (4)
Other |  | 6 | 0 | 1
Nonoperating Income (Expense) Total |  | 4 | (3) | (3)
Income (loss) before income tax |  | 5 | (3) | (3)
Total assets |  | (7,048) | (4,961) |
Special Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | [3] | 0 | 0 | 0
Passenger, Regional | [3] | 0 | 0 | 0
Total passenger revenue | [3] | 0 | 0 | 0
CPA revenues | [3] | 0 | 0 | 0
Freight and mail | [3] | 0 | 0 | 0
Other Net and Special Revenue | [3] | 0 | 0 | 192
Total Operating Revenues | [3] | 0 | 0 | 192
Operating expenses |  |  |  |
Operating expenses, excluding fuel | [3] | 32 | (30) | 0
Economic fuel | [3] | 0 | (23) | (8)
Total Operating Expenses | [3] | 32 | (53) | (8)
Nonoperating income (expense) |  |  |  |
Interest income | [3] | 0 | 0 | 0
Interest expense | [3] | 0 | 0 | 0
Other | [3] | 0 | 0 | 0
Nonoperating Income (Expense) Total | [3] | 0 | 0 | 0
Income (loss) before income tax | [3] | $ (32) | $ 53 | $ 200
[1] | The adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and does not include certain income and charges.
[2] | There are no depreciation expenses, capital expenditures or assets associated with purchased capacity flying at Alaska Regional.
[3] | Includes accounting adjustments related to mark-to-market fuel-hedge accounting charges (all years), pension settlement charge (2015), litigation-related matter (2015), non-cash curtailment gain (2014), a gain related to a legal matter (2014), and Special mileage plan revenue (2013).

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