SPECIAL CHARGES (CREDITS) - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Restructuring and Related Activities [Abstract] | ||||
| Labor contract ratification bonuses | $ (2) | $ 0 | $ 182 | $ 561 |
| Net gains on sale of assets and other special charges | 213 | 73 | 931 | 295 |
| Gains on various aircraft sale-leaseback transactions | $ 294 | $ 75 | $ 1,100 | $ 336 |