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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 3 |
Operating Revenues |  |  |  |
Total Operating Revenues | $ 2,288 | $ 2,156 | $ 4,164 | $ 3,988
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,422 | 1,410 | 2,853 | 2,804
Economic fuel | 502 | 475 | 922 | 884
Total Operating Expenses | 1,924 | 1,885 | 3,775 | 3,688
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 10 | 20 | 18
Interest expense | (20) | (25) | (42) | (49)
Interest Costs Capitalized | 3 | 4 | 7 | 9
Other | (7) | (1) | (17) | (13)
Nonoperating Income (Expense) Total | (13) | (12) | (32) | (35)
Income (loss) before income tax | 351 | 259 | 357 | 265
Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 2,288 | 2,156 | 4,164 | 3,988
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,414 | 1,371 | 2,819 | 2,734
Economic fuel | 499 | 497 | 923 | 919
Total Operating Expenses | 1,913 | 1,868 | 3,742 | 3,653
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 10 | 20 | 18
Interest expense | (20) | (25) | (42) | (49)
Interest Costs Capitalized | 3 | 4 | 7 | 9
Other | (7) | (1) | (17) | (13)
Nonoperating Income (Expense) Total | (13) | (12) | (32) | (35)
Income (loss) before income tax | 362 | 276 | 390 | 300
Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 1,929 | 1,859 | 3,499 | 3,438
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,167 | 1,135 | 2,319 | 2,266
Economic fuel | 422 | 432 | 780 | 799
Total Operating Expenses | 1,589 | 1,567 | 3,099 | 3,065
Nonoperating Income (Expense) |  |  |  |
Interest income | 17 | 13 | 33 | 24
Interest expense | (19) | (22) | (40) | (44)
Interest Costs Capitalized | 3 | 4 | 7 | 8
Other | (7) | 1 | (17) | (4)
Nonoperating Income (Expense) Total | (6) | (4) | (17) | (16)
Income (loss) before income tax | 334 | 288 | 383 | 357
Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 357 | 296 | 662 | 548
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 268 | 249 | 542 | 488
Economic fuel | 77 | 65 | 143 | 120
Total Operating Expenses | 345 | 314 | 685 | 608
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | (2) | 0 | (9)
Nonoperating Income (Expense) Total | 0 | (2) | 0 | (9)
Income (loss) before income tax | 12 | (20) | (23) | (69)
Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 112 | 138 | 229 | 249
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 95 | 123 | 192 | 227
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 95 | 123 | 192 | 227
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | (7) | (5) | (15) | (10)
Interest Costs Capitalized | 0 | 0 | 0 | 1
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | (7) | (5) | (15) | (9)
Income (loss) before income tax | 10 | 10 | 22 | 13
Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | (110) | (137) | (226) | (247)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (116) | (136) | (234) | (247)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (116) | (136) | (234) | (247)
Nonoperating Income (Expense) |  |  |  |
Interest income | (6) | (3) | (13) | (6)
Interest expense | 6 | 2 | 13 | 5
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | (1) | 0 | (1)
Income (loss) before income tax | 6 | (2) | 8 | (1)
Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Total Operating Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 8 | 39 | 34 | 70
Economic fuel | 3 | (22) | (1) | (35)
Total Operating Expenses | 11 | 17 | 33 | 35
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Interest Costs Capitalized | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | (11) | (17) | (33) | (35)
Passenger [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2,111 | 1,997 | 3,827 | 3,681
Passenger [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2,111 | 1,997 | 3,827 | 3,681
Passenger [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 1,767 | 1,711 | 3,189 | 3,152
Passenger [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 344 | 286 | 638 | 529
Passenger [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Passenger [Member] | Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Capacity Purchase Agreements [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 112 | 137 | 228 | 247
Capacity Purchase Agreements [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | (112) | (137) | (228) | (247)
Capacity Purchase Agreements [Member] | Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 118 | 108 | 228 | 215
Mileage plan other revenue [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 118 | 108 | 228 | 215
Mileage plan other revenue [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 105 | 99 | 205 | 197
Mileage plan other revenue [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 13 | 9 | 23 | 18
Mileage plan other revenue [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Mileage plan other revenue [Member] | Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 0 | 0 | 0
Cargo and Freight [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 59 | 51 | 109 | 92
Cargo and Freight [Member] | Air Group Adjusted [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 59 | 51 | 109 | 92
Cargo and Freight [Member] | Alaska Mainline [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 57 | 49 | 105 | 89
Cargo and Freight [Member] | Alaska Regional [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 1 | 1 | 1
Cargo and Freight [Member] | Horizon [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 0 | 1 | 1 | 2
Cargo and Freight [Member] | Intersegment Elimination [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | 2 | 0 | 2 | 0
Cargo and Freight [Member] | Special Revenue and Charges [Member] |  |  |  |
Operating Revenues |  |  |  |
Revenue from contract with customer, including assessed taxes | $ 0 | $ 0 | $ 0 | $ 0

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