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Special Charges (Credits) and Unrealized (Gains) Losses on Investments - Components of Special Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating: |  |  |
CARES Act grant | $ (4,021) | $ (3,536) | $ 0
Severance and benefit costs | 438 | 575 | 16
Impairment of assets | 97 | 318 | 171
(Gains) losses on sale of assets and other special charges | 119 | 27 | 59
Total operating special charges (credits) | (3,367) | (2,616) | 246
Nonoperating unrealized (gains) losses on investments, net | 34 | 194 | (153)
Nonoperating debt extinguishment and modification fees | 50 | 0 | 0
Nonoperating special termination benefits and settlement losses | 31 | 687 | 0
Nonoperating credit loss on BRW Term Loan and related guarantee | 0 | 697 | 0
Total nonoperating special charges and unrealized (gains) losses on investments, net | 115 | 1,578 | (153)
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net | (3,252) | (1,038) | 93
Income tax expense (benefit), net of valuation allowance | 728 | 404 | (21)
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes | $ (2,524) | $ (634) | $ 72

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