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Special Charges (Credits) - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Other Income and Expenses [Abstract] |  |
CARES Act grant | $ 0 | $ (1,810)
Severance and benefit costs | 0 | 417
(Gains) losses on sale of assets and other special charges | (8) | 16
Total operating special charges (credits) | (8) | (1,377)
Nonoperating unrealized losses on investments, net | 0 | 22
Nonoperating debt extinguishment fees | 7 | 0
Nonoperating special termination benefits | 0 | 46
Total nonoperating special charges and unrealized losses on investments, net | 7 | 68
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net | (1) | (1,309)
Income tax expense, net of valuation allowance | 0 | 291
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net of income taxes | $ (1) | $ (1,018)

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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Special Termination Benefits + References No definition available. + Details
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