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EMPLOYEE BENEFIT PLANS - Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Benefit plan assets by asset class |  |
Benefit plan assets | $ 15,672 | $ 16,166
Level 1 and Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 3,234 | 4,749
Level 1 and Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,165 | 2,158
Level 1 and Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 468 | 1,156
Level 1 and Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 981 | 769
Level 1 and Level 2 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 595 | 419
Level 1 and Level 2 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 25 | 247
Level 1 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,988 | 1,848
Level 1 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 85 | 300
Level 1 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 330 | 471
Level 1 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 978 | 647
Level 1 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 595 | 419
Level 1 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 0 | 11
Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,246 | 2,901
Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,080 | 1,858
Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 138 | 685
Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 3 | 122
Level 2 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 0 | 0
Level 2 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 25 | 236
NAV |  |
Benefit plan assets by asset class |  |
Benefit plan assets | $ 12,438 | $ 11,417

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