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Components of Special Items (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating:    
Severance and benefit costs $ 37 $ 8
Labor agreement costs   100
Cleveland airport lease restructuring   74
(Gains) losses on sale of assets and other special charges 14 8
Special charges 51 190
Nonoperating:    
Foreign currency loss   8
Special items before income taxes 51 198
Income tax benefit related to special items (18) (72)
Total special items, net of tax $ 33 $ 126