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EMPLOYEE BENEFIT PLANS - Status Of Qualified Defined-Benefit Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan |  |  |
Projected benefit obligation (PBO) |  |  |
Beginning of year | $ 2,183 | $ 2,079 |
Acquisition impact | 333 | 0 |
Service cost | 28 | 29 |
Interest cost | 113 | 108 | $ 65
Actuarial (gain)/loss | (86) | 83 |
Benefits paid | (109) | (116) |
End of year | 2,462 | 2,183 | 2,079
Plan assets at fair value |  |  |
Beginning of year | 2,023 | 1,894 |
Acquisition impact | 290 | 0 |
Actual return on plan assets | 72 | 245 |
Pension contribution | 31 | 0 |
Benefits paid | (109) | (116) |
End of year | 2,307 | 2,023 | $ 1,894
Funded status (unfunded) | $ (155) | $ (160) |
Percent funded | 94.00% | 93.00% |
Postretirement Medical Benefits |  |  |
Plan assets at fair value |  |  |
End of year | $ 48 |  |
Funded status (unfunded) | (111) |  |
Postretirement Medical Benefits | Alaska Air Group |  |  |
Projected benefit obligation (PBO) |  |  |
Beginning of year | 98 |  |
End of year | 93 | $ 98 |
Postretirement Medical Benefits | Hawaiian Holdings, Inc. |  |  |
Projected benefit obligation (PBO) |  |  |
End of year | $ 159 |  |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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