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Special Charges and Unrealized (Gains) Losses on Investments (Tables) | 12 Months Ended
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Dec. 31, 2019
Restructuring and Related Activities [Abstract] |
Components of Special Charges | Special charges and unrealized gains and losses on investments in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):
Operating: |  | 2019 |  | 2018 |  | 2017
Impairment of assets |  | $ | 171 |  |  | $ | 377 |  |  | $ | 25 |
Severance and benefit costs |  | 16 |  |  | 41 |  |  | 116 |
Termination of an engine maintenance service agreement |  | — |  |  | 64 |  |  | — |
(Gains) losses on sale of assets and other special charges |  | 59 |  |  | 5 |  |  | 35 |
Total operating special charges |  | 246 |  |  | 487 |  |  | 176 |
Nonoperating unrealized (gains) losses on investments |  | (153 | ) |  | 5 |  |  | — |
Total special charges and unrealized (gains) losses on investments |  | 93 |  |  | 492 |  |  | 176 |
Income tax benefit |  | (21 | ) |  | (110 | ) |  | (63 | )
Income tax adjustments (Note 6) |  | — |  |  | (5 | ) |  | (189 | )
Total special charges and unrealized (gains) losses on investments, net of income taxes and income tax adjustments |  | $ | 72 |  |  | $ | 377 |  |  | $ | (76 | )

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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