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Special Charges (Credits) (Tables) | 12 Months Ended
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Dec. 31, 2023
Restructuring and Related Activities [Abstract] |
Components of Special Charges | For the years ended December 31, operating and nonoperating special charges (credits) and unrealized (gains) losses on investments in the statements of consolidated operations consisted of the following (in millions):
Operating: |  | 2023 |  | 2022 |  | 2021
Labor contract ratification bonuses |  | $ | 814 |  |  | $ | — |  |  | $ | — |
CARES Act grant |  | — |  |  | — |  |  | (4,021) |
Severance and benefit costs |  | — |  |  | — |  |  | 438 |
Impairment of assets |  | — |  |  | — |  |  | 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 |  | — |  |  | — |  |  | 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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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482017/420-10-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479823/420-10-S99-2 + Details
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