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Special Charges and Mark-to-Market Adjustments (Tables) | 9 Months Ended
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Sep. 30, 2018
Other Income and Expenses [Abstract] |
Components of Special Charges | For the three and nine months ended September 30, special charges consisted of the following (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
Operating: | 2018 |  | 2017 |  | 2018 |  | 2017
Impairment of assets | $ | 11 |  |  | $ | 15 |  |  | $ | 145 |  |  | $ | 15 |
Severance and benefit costs | 9 |  |  | 23 |  |  | 34 |  |  | 101 |
(Gains) losses on sale of assets and other special charges | (3 | ) |  | 12 |  |  | 7 |  |  | 29 |
Total special charges | 17 |  |  | 50 |  |  | 186 |  |  | 145 |
Nonoperating mark-to-market ("MTM") (gains) losses on equity investments | (29 | ) |  | — |  |  | 61 |  |  | — |
Total special charges and MTM (gains) losses on equity investments | (12 | ) |  | 50 |  |  | 247 |  |  | 145 |
Income tax expense (benefit) | 3 |  |  | (18 | ) |  | (55 | ) |  | (52 | )
Total special charges and MTM (gains) losses on equity investments, net of tax | $ | (9 | ) |  | $ | 32 |  |  | $ | 192 |  |  | $ | 93 |
Accrual Activity | Activity related to these accruals is as follows (in millions):
| Severance and Benefits |  | Permanently Grounded Aircraft
Balance at December 31, 2017 | $ | 37 |  |  | $ | 22 |
Accrual | 34 |  |  | — |
Payments | (42 | ) |  | (2 | )
Balance at September 30, 2018 | $ | 29 |  |  | $ | 20 |
| Severance and Benefits |  | Permanently Grounded Aircraft
Balance at December 31, 2016 | $ | 14 |  |  | $ | 41 |
Accrual | 101 |  |  | — |
Payments | (84 | ) |  | (13 | )
Balance at September 30, 2017 | $ | 31 |  |  | $ | 28 |

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27011515&loc=d3e140864-122747 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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