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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