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EMPLOYEE BENEFIT PLANS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) plan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of qualified defined benefit plans | plan | 5 |  |
Number of defined contribution plans | plan | 12 |  |
Expected required contributions, next fiscal year | $ 52,000,000 |  |
Total expense for the defined-contribution plans | 256,000,000 | $ 203,000,000 | $ 160,000,000
Variable incentive pay | $ 358,000,000 | 200,000,000 | 257,000,000
Operational Performance Rewards Program entitles all Air Group employees to maximum quarterly payouts (in dollars per quarter) | 450 |  |
Alaska Air Group |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of qualified defined benefit plans | plan | 4 |  |
Hawaiian Holdings, Inc. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of qualified defined benefit plans | plan | 1 |  |
Number defined benefit postretirement and medical life insurance plans | plan | 4 |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 2,400,000,000 | 2,100,000,000 |
Benefit obligation | 2,462,000,000 | 2,183,000,000 | $ 2,079,000,000
Postretirement Medical Benefits | Alaska Air Group |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | 93,000,000 | 98,000,000 |
Postretirement Medical Benefits | Hawaiian Holdings, Inc. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | 159,000,000 |  |
Postretirement Health Coverage |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total liability net of a prefunded trust account | 86,000,000 | 72,000,000 |
Prefunded trust account | $ 13,000,000 | $ 10,000,000 |

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