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OPERATING SEGMENT INFORMATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenues |  |  |  |  |  |
Passenger, Mainline |  | $ 5,858 | $ 4,098 |  | $ 3,939 |
Passenger, Regional |  | 960 | 908 |  | 854 |
Total passenger revenue |  | 6,818 | 5,006 |  | 4,793 |
CPA revenues |  | 0 | 0 |  | 0 |
Freight and mail |  | 114 | 108 |  | 108 |
Other Net and Special Revenue |  | 1,001 | 817 |  | 697 |
Total Operating Revenues |  | 7,933 | 5,931 |  | 5,598 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | 5,226 | 3,751 |  | 3,346 |
Special items—merger-related costs and other |  | 118 | 117 |  |  |
Economic fuel |  | 1,447 | 831 |  | 954 |
Total Operating Expenses |  | 6,673 | 4,582 |  | 4,300 |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income |  | 34 | 27 |  | 21 |
Interest expense |  | (103) | (55) |  | (42) |
Other |  | 16 | 24 |  | 35 |
Nonoperating Income (Expense) Total |  | (53) | (4) |  | 14 |
Income (loss) before income tax |  | 1,207 | 1,345 |  | 1,312 |
Depreciation |  | 372 | 363 |  | 320 |
Capital expenditures |  | 1,026 | 678 |  | 831 |
Total assets |  | 10,740 | 9,962 |  |  |
Air Group Adjusted [Member] |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Passenger, Mainline | [1] | 5,858 | 4,098 |  | 3,939 |
Passenger, Regional | [1] | 960 | 908 |  | 854 |
Total passenger revenue | [1] | 6,818 | 5,006 |  | 4,793 |
CPA revenues | [1] | 0 | 0 |  | 0 |
Freight and mail | [1] | 114 | 108 |  | 108 |
Other Net and Special Revenue | [1] | 1,001 | 817 |  | 697 |
Total Operating Revenues | [1] | 7,933 | 5,931 |  | 5,598 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel | [1] | 5,108 | 3,634 |  | 3,314 |
Economic fuel | [1] | 1,454 | 844 |  | 954 |
Total Operating Expenses | [1] | 6,562 | 4,478 |  | 4,268 |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income | [1] | 34 | 27 |  | 21 |
Interest expense | [1] | (103) | (55) |  | (42) |
Other | [1] | 16 | 24 |  | 35 |
Nonoperating Income (Expense) Total | [1] | (53) | (4) |  | 14 |
Income (loss) before income tax | [1] | 1,318 | 1,449 |  | 1,344 |
Alaska Mainline [Member] |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Passenger, Mainline |  | 5,858 | 4,098 |  | 3,939 |
Passenger, Regional |  | 0 | 0 |  | 0 |
Total passenger revenue |  | 5,858 | 4,098 |  | 3,939 |
CPA revenues |  | 0 | 0 |  | 0 |
Freight and mail |  | 110 | 104 |  | 103 |
Other Net and Special Revenue |  | 922 | 738 |  | 621 |
Total Operating Revenues |  | 6,890 | 4,940 |  | 4,663 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | 4,257 | 2,883 |  | 2,653 |
Economic fuel |  | 1,282 | 719 |  | 823 |
Total Operating Expenses |  | 5,539 | 3,602 |  | 3,476 |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income |  | 39 | 26 |  | 19 |
Interest expense |  | (92) | (42) |  | (28) |
Other |  | 14 | 19 |  | 28 |
Nonoperating Income (Expense) Total |  | (39) | 3 |  | 19 |
Income (loss) before income tax |  | 1,312 | 1,341 |  | 1,206 |
Depreciation | [2] | 308 | 296 |  | 268 |
Capital expenditures | [2] | 734 | 608 |  | 821 |
Total assets | [2] | 16,650 | 15,260 |  |  |
Alaska Regional [Member] |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Passenger, Mainline |  | 0 | 0 |  | 0 |
Passenger, Regional |  | 960 | 908 |  | 854 |
Total passenger revenue |  | 960 | 908 |  | 854 |
CPA revenues |  | 0 | 0 |  | 0 |
Freight and mail |  | 4 | 5 |  | 5 |
Other Net and Special Revenue |  | 74 | 74 |  | 72 |
Total Operating Revenues |  | 1,038 | 987 |  | 931 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | 851 | 769 |  | 695 |
Economic fuel |  | 172 | 125 |  | 131 |
Total Operating Expenses |  | 1,023 | 894 |  | 826 |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income |  | 0 | 0 |  | 0 |
Interest expense |  | 0 | 0 |  | 0 |
Other |  | 0 | 0 |  | 0 |
Nonoperating Income (Expense) Total |  | 0 | 0 |  | 0 |
Income (loss) before income tax |  | 15 | 93 |  | 105 |
Horizon [Member] |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Passenger, Mainline |  | 0 | 0 |  | 0 |
Passenger, Regional |  | 0 | 0 |  | 0 |
Total passenger revenue |  | 0 | 0 |  | 0 |
CPA revenues |  | 426 | 424 |  | 408 |
Freight and mail |  | 0 | 0 |  | 0 |
Other Net and Special Revenue |  | 4 | 4 |  | 4 |
Total Operating Revenues |  | 430 | 428 |  | 412 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | 427 | 407 |  | 375 |
Economic fuel |  | 0 | 0 |  | 0 |
Total Operating Expenses |  | 427 | 407 |  | 375 |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income |  | 0 | 1 |  | 0 |
Interest expense |  | (13) | (9) |  | (10) |
Other |  | 2 | 1 |  | 1 |
Nonoperating Income (Expense) Total |  | (11) | (7) |  | (9) |
Income (loss) before income tax |  | (8) | 14 |  | 28 |
Depreciation |  | 64 | 67 |  | 52 |
Capital expenditures |  | 292 | 70 |  | 10 |
Total assets |  | 929 | 690 |  |  |
Parent [Member] |  |  |  |  |  |
Nonoperating Income (Expense) |  |  |  |  |  |
Total assets |  | (6,839) | (5,988) |  |  |
Intersegment Eliminations |  |  |  |  |  |
Operating revenues |  |  |  |  |  |
Passenger, Mainline |  | 0 | 0 |  | 0 |
Passenger, Regional |  | 0 | 0 |  | 0 |
Total passenger revenue |  | 0 | 0 |  | 0 |
CPA revenues |  | (426) | (424) |  | (408) |
Freight and mail |  | 0 | (1) |  | 0 |
Other Net and Special Revenue |  | 1 | 1 |  | 0 |
Total Operating Revenues |  | (425) | (424) |  | (408) |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | (427) | (425) |  | (409) |
Economic fuel |  | 0 | 0 |  | 0 |
Total Operating Expenses |  | (427) | (425) |  | (409) |
Nonoperating Income (Expense) |  |  |  |  |  |
Interest income |  | (5) | 0 |  | 2 |
Interest expense |  | 2 | (4) |  | (4) |
Other |  | 0 | 4 |  | 6 |
Nonoperating Income (Expense) Total |  | (3) | 0 |  | 4 |
Income (loss) before income tax |  | (1) | 1 |  | 5 |
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 |  | 0 |
Total Operating Revenues | [3] | 0 | 0 |  | 0 |
Operating expenses |  |  |  |  |  |
Operating expenses, excluding fuel |  | 118 | 117 | [3] | 32 | [3]
Economic fuel |  | (7) | (13) | [3] | 0 | [3]
Total Operating Expenses | [3] | 111 | 104 |  | 32 |
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] | $ (111) | $ (104) |  | $ (32) |
[1] | Year Ended December 31, 2015Mainline Regional Horizon Consolidating & Other(b) Air Group Adjusted(c) Special Items(d) ConsolidatedOperating revenues Passenger Mainline$3,939 $— $— $— $3,939 $— $3,939Regional— 854 — — 854 — 854Total passenger revenues3,939 854 — — 4,793 — 4,793CPA revenues— — 408 (408) — — —Freight and mail103 5 — — 108 — 108Other-net621 72 4 — 697 — 697Total operating revenues4,663 931 412 (408) 5,598 — 5,598 Operating expenses Operating expenses, excluding fuel2,653 695 375 (409) 3,314 32 3,346Fuel expense823 131 — — 954 — 954Total operating expenses3,476 826 375 (409) 4,268 32 4,300 Nonoperating income (expense) Interest income19 — — 2 21 — 21Interest expense(28) — (10) (4) (42) — (42)Other28 — 1 6 35 — 35 19 — (9) 4 14 — 14Income (loss) before income tax$1,206 $105 $28 $5 $1,344 $(32) $1,312
[2] | 2017 2016 2015Depreciation and amortization: Mainline$308 $296 $268Horizon64 67 52Consolidated$372 $363 $320 Capital expenditures: Mainline$734 $608 $821Horizon292 70 10Consolidated$1,026 $678 $831 Total assets at end of period: Mainline$16,650 $15,260 Horizon929 690 Consolidating & Other(6,839) (5,988) Consolidated$10,740 $9,962
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