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EMPLOYEE BENEFIT PLANS - Benefit Plan Assets Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Benefit plan assets by asset class |  |
Benefit plan assets | $ 15,641 | $ 20,046
Level 1 and Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 3,312 | 7,393
Level 1 and Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 894 | 4,487
Level 1 and Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 445 | 1,195
Level 1 and Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,443 | 1,048
Level 1 and Level 2 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 343 | 407
Level 1 and Level 2 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 187 | 256
Level 1 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,486 | 3,900
Level 1 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 629 | 2,390
Level 1 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 420 | 1,034
Level 1 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 77 | 69
Level 1 | Delta common stock |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 343 | 407
Level 1 | Real assets |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 17 | 0
Level 2 |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,826 | 3,493
Level 2 | Cash equivalents |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 265 | 2,097
Level 2 | Equities and equity-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 25 | 161
Level 2 | Fixed income and fixed income-related instruments |  |
Benefit plan assets by asset class |  |
Benefit plan assets | 1,366 | 979
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 | 170 | 256
NAV |  |
Benefit plan assets by asset class |  |
Benefit plan assets | $ 12,329 | $ 12,653

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