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Components of Special Items (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating: |  |  |  |  |  |  |  |  |  |  |
Impairment of assets |  |  | $ 412 |  | $ 48 | $ 18 | $ 11 | $ 2 | $ 412 | $ 79 | $ 49
Cleveland airport lease restructuring |  |  |  | $ 74 |  |  |  |  | 74 |  |
Labor agreement costs | $ (60) | $ 14 | 10 | 100 | 18 |  |  |  | 64 | 18 |
Severance and benefit costs | 10 | 13 | 6 | 8 | 4 | 28 | 25 | 50 | 37 | 107 | 199
(Gains) losses on sale of assets and other special charges | 19 | 18 | 6 | 8 | 61 | 30 | 19 | 12 | 51 | 122 | 195
Special charges | (31) | 45 | 434 | 190 | 131 | 76 | 55 | 64 | 638 | 326 | 443
Nonoperating and income taxes: |  |  |  |  |  |  |  |  |  |  |
Losses (gain) on extinguishment of debt and other |  |  | (9) | 8 | 7 | 61 | 128 | 6 | (1) | 202 | 74
Income tax benefit related to special charges | 12 | (16) | (153) | (72) | (11) |  |  |  | (229) | (11) | (10)
Income tax adjustments (Notes 6 and 7) | 180 |  |  |  | 88 | (3,218) |  |  | 180 | (3,130) |
Total operating and nonoperating special items, net of income taxes | $ 161 | $ 29 | $ 272 | $ 126 | $ 215 | $ (3,081) | $ 183 | $ 70 | $ 588 | $ (2,613) | $ 507

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