SPECIAL CHARGES - Schedule of Components of Special Charges (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Restructuring and Related Activities [Abstract] | ||||
| Labor contract ratification bonuses | $ 561 | $ 0 | $ 561 | $ 0 |
| (Gains) losses on sale of assets and other special charges | (114) | 36 | (222) | 49 |
| Total operating special charges | 447 | 36 | 340 | 49 |
| Nonoperating unrealized (gains) losses on investments, net | (26) | 33 | (5) | 70 |
| Nonoperating debt extinguishment and modification fees | 0 | 0 | 0 | 35 |
| Total nonoperating special charges and unrealized (gains) losses on investments, net | (26) | 33 | (5) | 105 |
| Total operating and nonoperating special charges and unrealized (gains) losses on investments, net | 422 | 69 | 335 | 154 |
| Income tax benefit, net of valuation allowance | (128) | (8) | (127) | (19) |
| Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes | $ 293 | $ 61 | $ 208 | $ 135 |