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OPERATING SEGMENT INFORMATION (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]    
Number of Operating Segments | segment 3  
Operating Revenues    
Total Operating Revenues $ 1,876 $ 1,832
Operating expenses    
Operating Expenses, Excluding Fuel 1,431 1,394
Economic fuel 420 409
Total Operating Expenses 1,851 1,803
Nonoperating Income (Expense)    
Interest income 9 8
Interest expense (22) (24)
Interest Costs Capitalized 4 5
Other (10) (12)
Nonoperating Income (Expense) Total (19) (23)
Income (loss) before income tax 6 6
Air Group Adjusted [Member]    
Operating Revenues    
Total Operating Revenues 1,876 1,832
Operating expenses    
Operating Expenses, Excluding Fuel 1,405 1,363
Economic fuel 424 422
Total Operating Expenses 1,829 1,785
Nonoperating Income (Expense)    
Interest income 9 8
Interest expense (22) (24)
Interest Costs Capitalized 4 5
Other (10) (12)
Nonoperating Income (Expense) Total (19) (23)
Income (loss) before income tax 28 24
Alaska Mainline [Member]    
Operating Revenues    
Total Operating Revenues 1,570 1,579
Operating expenses    
Operating Expenses, Excluding Fuel 1,152 1,131
Economic fuel 358 367
Total Operating Expenses 1,510 1,498
Nonoperating Income (Expense)    
Interest income 16 11
Interest expense (21) (22)
Interest Costs Capitalized 4 4
Other (10) (5)
Nonoperating Income (Expense) Total (11) (12)
Income (loss) before income tax 49 69
Alaska Regional [Member]    
Operating Revenues    
Total Operating Revenues 305 252
Operating expenses    
Operating Expenses, Excluding Fuel 274 239
Economic fuel 66 55
Total Operating Expenses 340 294
Nonoperating Income (Expense)    
Interest income 0 0
Interest expense 0 0
Interest Costs Capitalized 0 0
Other 0 (7)
Nonoperating Income (Expense) Total 0 (7)
Income (loss) before income tax (35) (49)
Horizon [Member]    
Operating Revenues    
Total Operating Revenues 117 111
Operating expenses    
Operating Expenses, Excluding Fuel 97 104
Economic fuel 0 0
Total Operating Expenses 97 104
Nonoperating Income (Expense)    
Interest income 0 0
Interest expense (8) (5)
Interest Costs Capitalized 0 1
Other 0 0
Nonoperating Income (Expense) Total (8) (4)
Income (loss) before income tax 12 3
Intersegment Elimination [Member]    
Operating Revenues    
Total Operating Revenues (116) (110)
Operating expenses    
Operating Expenses, Excluding Fuel (118) (111)
Economic fuel 0 0
Total Operating Expenses (118) (111)
Nonoperating Income (Expense)    
Interest income (7) (3)
Interest expense 7 3
Interest Costs Capitalized 0 0
Other 0 0
Nonoperating Income (Expense) Total 0 0
Income (loss) before income tax 2 1
Special Revenue and Charges [Member]    
Operating Revenues    
Total Operating Revenues 0 0
Operating expenses    
Operating Expenses, Excluding Fuel 26 31
Economic fuel (4) (13)
Total Operating Expenses 22 18
Nonoperating Income (Expense)    
Interest income 0 0
Interest expense 0 0
Interest Costs Capitalized 0 0
Other 0 0
Nonoperating Income (Expense) Total 0 0
Income (loss) before income tax (22) (18)
Passenger [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 1,716 1,684
Passenger [Member] | Air Group Adjusted [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 1,716 1,684
Passenger [Member] | Alaska Mainline [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 1,422 1,441
Passenger [Member] | Alaska Regional [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 294 243
Passenger [Member] | Horizon [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Passenger [Member] | Intersegment Elimination [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Passenger [Member] | Special Revenue and Charges [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Capacity Purchase Agreements [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Capacity Purchase Agreements [Member] | Air Group Adjusted [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Capacity Purchase Agreements [Member] | Alaska Mainline [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Capacity Purchase Agreements [Member] | Alaska Regional [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Capacity Purchase Agreements [Member] | Horizon [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 116 110
Capacity Purchase Agreements [Member] | Intersegment Elimination [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes (116) (110)
Capacity Purchase Agreements [Member] | Special Revenue and Charges [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Mileage plan other revenue [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 110 107
Mileage plan other revenue [Member] | Air Group Adjusted [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 110 107
Mileage plan other revenue [Member] | Alaska Mainline [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 100 98
Mileage plan other revenue [Member] | Alaska Regional [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 10 9
Mileage plan other revenue [Member] | Horizon [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Mileage plan other revenue [Member] | Intersegment Elimination [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Mileage plan other revenue [Member] | Special Revenue and Charges [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Cargo and Freight [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 50 41
Cargo and Freight [Member] | Air Group Adjusted [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 50 41
Cargo and Freight [Member] | Alaska Mainline [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 48 40
Cargo and Freight [Member] | Alaska Regional [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 1 0
Cargo and Freight [Member] | Horizon [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 1 1
Cargo and Freight [Member] | Intersegment Elimination [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes 0 0
Cargo and Freight [Member] | Special Revenue and Charges [Member]    
Operating Revenues    
Revenue from contract with customer, including assessed taxes $ 0 $ 0