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Special Charges (Credits) - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other Income and Expenses [Abstract] |  |  |  |
CARES Act grant | $ (1,132) | $ (1,494) | $ (4,021) | $ (3,083)
Impairment of assets | 46 | 38 | 105 | 168
Severance and benefit costs | 5 | 350 | 433 | 413
(Gains) losses on sale of assets and other special charges | (17) | 25 | 60 | 35
Total operating special charges (credits) | (1,098) | (1,081) | (3,423) | (2,467)
Nonoperating unrealized (gains) losses on investments, net | 34 | (15) | (91) | 295
Nonoperating debt extinguishment and modification fees | (12) | 0 | 50 | 0
Nonoperating special termination benefits and settlement losses | 0 | 415 | 46 | 646
Nonoperating credit loss on BRW Term Loan and related guarantee | 0 |  | 0 | 697
Total nonoperating special charges and unrealized (gains) losses on investments, net | 22 | 400 | 5 | 1,638
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net | (1,076) | (681) | (3,418) | (829)
Income tax expense, net of valuation allowance | 274 | 148 | 768 | 375
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes | $ (802) | $ (533) | $ (2,650) | $ (454)

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