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Components of Special Charges (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Operating: |  |  |  |
Severance and benefit costs | $ 41 | $ 6 | $ 78 | $ 14
Impairment of assets |  | 412 |  | 412
Labor agreement costs |  | 10 |  | 110
Cleveland airport lease restructuring |  |  |  | 74
(Gains) losses on sale of assets and other special charges | 3 | 6 | 17 | 14
Special charges | 44 | 434 | 95 | 624
Nonoperating: |  |  |  |
Other (gain) loss |  | (9) |  | (1)
Special charges before income taxes | 44 | 425 | 95 | 623
Income tax benefit related to special charges | (16) | (153) | (34) | (225)
Total special charges, net of tax | $ 28 | $ 272 | $ 61 | $ 398

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