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Special Charges (Credits) - Components of Special Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating: |  |  |
Labor contract ratification bonuses | $ 814 | $ 0 | $ 0
CARES Act grant | 0 | 0 | (4,021)
Severance and benefit costs | 0 | 0 | 438
Impairment of assets | 0 | 0 | 97
(Gains) losses on sale of assets and other special charges | 135 | 140 | 119
Total operating special charges (credits) | 949 | 140 | (3,367)
Nonoperating unrealized (gains) losses on investments, net | (27) | (20) | 34
Nonoperating debt extinguishment and modification fees | 11 | 7 | 50
Nonoperating special termination benefits and settlement losses | 0 | 0 | 31
Total nonoperating special charges and unrealized (gains) losses on investments, net | (16) | (13) | 115
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net | 933 | 127 | (3,252)
Income tax expense (benefit), net of valuation allowance | (214) | (33) | 728
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes | $ 719 | $ 94 | $ (2,524)

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