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Components of Special Charges (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Operating: |  |  |  |
Severance and benefit costs | $ 23 | $ 13 | $ 101 | $ 27
Impairment of assets | 15 |  | 15 | 412
Labor agreement costs |  | 14 |  | 124
Cleveland airport lease restructuring |  |  |  | 74
(Gains) losses on sale of assets and other special charges | 12 | 18 | 29 | 32
Special charges | 50 | 45 | 145 | 669
Nonoperating: |  |  |  |
Other (gain) loss |  |  |  | (1)
Special charges before income taxes | 50 | 45 | 145 | 668
Income tax benefit related to special charges | (18) | (16) | (52) | (241)
Total special charges, net of tax | $ 32 | $ 29 | $ 93 | $ 427

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