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Special Charges (Tables) | 12 Months Ended
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Dec. 31, 2018
Business Combinations [Abstract] |
Components of Special Charges | Special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):
Operating: |  | 2018 |  | 2017 (a) |  | 2016 (a)
Impairment of assets |  | $ | 377 |  |  | $ | 25 |  |  | $ | 412 |
Termination of an engine maintenance service agreement |  | 64 |  |  | — |  |  | — |
Severance and benefit costs |  | 41 |  |  | 116 |  |  | 37 |
Cleveland airport lease restructuring |  | — |  |  | — |  |  | 74 |
Labor agreement costs |  | — |  |  | — |  |  | 171 |
(Gains) losses on sale of assets and other special charges |  | 5 |  |  | 35 |  |  | 51 |
Total operating special charges |  | 487 |  |  | 176 |  |  | 745 |
Nonoperating: |  |  |  |  |  |
Postretirement curtailment gain |  | — |  |  | — |  |  | (107 | )
Gains on extinguishment of debt and other |  | — |  |  | — |  |  | (1 | )
Total operating and nonoperating special charges before income taxes |  | 487 |  |  | 176 |  |  | 637 |
Nonoperating mark-to-market ("MTM") losses on financial instruments |  | 5 |  |  | — |  |  | — |
Total special charges and MTM losses on financial instruments |  | 492 |  |  | 176 |  |  | 637 |
Income tax benefit |  | (110 | ) |  | (63 | ) |  | (229 | )
Income tax adjustments (Note 7) |  | (5 | ) |  | (179 | ) |  | 180 |
Total special charges and MTM losses on financial instruments, net of income taxes and income tax adjustments |  | $ | 377 |  |  | $ | (66 | ) |  | $ | 588 |
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
Activity Related to the Accruals for Severance and Medical Costs and Future Lease Payments | Activity related to the accruals for severance and medical costs and future lease payments on permanently grounded aircraft is as follows (in millions):
| Severance/ Benefit Costs |  | Permanently Grounded Aircraft
Balance at December 31, 2015 | $ | 27 |  |  | $ | 78 |
Accrual and related adjustments | 37 |  |  | (17 | )
Payments | (50 | ) |  | (20 | )
Balance at December 31, 2016 | 14 |  |  | 41 |
Accrual | 116 |  |  | (4 | )
Payments | (93 | ) |  | (15 | )
Balance at December 31, 2017 | 37 |  |  | 22 |
Accrual | 41 |  |  | (7 | )
Payments | (53 | ) |  | (3 | )
Balance at December 31, 2018 | $ | 25 |  |  | $ | 12 |

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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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