Special Charges - Schedule of Components of Special Charges (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2024 |
Sep. 30, 2023 |
|
| Operating: | ||||
| (Gains) losses on sale of assets and other special charges | $ (5) | $ 28 | $ 44 | $ 88 |
| Labor contract ratification bonuses | 0 | 1 | 0 | 814 |
| Total operating special charges | (5) | 29 | 44 | 902 |
| Nonoperating: | ||||
| Nonoperating unrealized (gains) losses on investments, net | 90 | 54 | 160 | (54) |
| Nonoperating debt extinguishment and modification fees | 75 | 0 | 110 | 11 |
| Total nonoperating special charges and unrealized (gains) losses on investments, net | 165 | 54 | 270 | (43) |
| Total operating and nonoperating special charges and unrealized (gains) losses on investments, net | 160 | 83 | 314 | 859 |
| Income tax benefit, net of valuation allowance | (15) | (7) | (34) | (204) |
| Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes | $ 145 | $ 76 | $ 280 | $ 655 |