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Special Charges (Credits) (Tables) | 9 Months Ended
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Sep. 30, 2022
Other Income and Expenses [Abstract] |
Components of Special Charges | For the three and nine months ended September 30, operating and nonoperating special charges (credits) and unrealized (gains) losses on investments in the statements of consolidated operations consisted of the following (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
CARES Act grant | $ | — |  |  | $ | (1,132) |  |  | $ | — |  |  | $ | (4,021) |
Severance and benefit costs | — |  |  | 5 |  |  | — |  |  | 433 |
Impairment of assets | — |  |  | 46 |  |  | — |  |  | 105 |
(Gains) losses on sale of assets and other special charges | 20 |  |  | (17) |  |  | 124 |  |  | 60 |
Total operating special charges (credits) | 20 |  |  | (1,098) |  |  | 124 |  |  | (3,423) |
Nonoperating unrealized (gains) losses on investments, net | (28) |  |  | 34 |  |  | 12 |  |  | (91) |
Nonoperating debt extinguishment and modification fees | — |  |  | (12) |  |  | 7 |  |  | 50 |
Nonoperating special termination benefits | — |  |  | — |  |  | — |  |  | 46 |
Total nonoperating special charges and unrealized (gains) losses on investments, net | (28) |  |  | 22 |  |  | 19 |  |  | 5 |
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net | (8) |  |  | (1,076) |  |  | 143 |  |  | (3,418) |
Income tax (benefit) expense, net of valuation allowance | (7) |  |  | 274 |  |  | (17) |  |  | 768 |
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes | $ | (15) |  |  | $ | (802) |  |  | $ | 126 |  |  | $ | (2,650) |

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