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Components of Special Charges (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating:                      
Severance and benefit costs $ 15 $ 23 $ 41 $ 37 $ 10 $ 13 $ 6 $ 8 $ 116 $ 37 $ 107
Impairment of assets 10 15         412   25 412 79
Cleveland airport lease restructuring               74   74  
Labor agreement costs         (60) 14 10 100   64 18
(Gains) losses on sale of assets and other special charges 6 12 3 14 19 18 6 8 35 51 122
Total operating special charges 31 50 44 51 (31) 45 434 190 176 638 326
Nonoperating income (expense):                      
(Gains) losses on extinguishment of debt and other             (9) 8   (1) 202
Total operating and nonoperating special charges before income taxes                 176 637 528
Income tax benefit related to special charges (11) (18) (16) (18) 12 (16) (153) (72) (63) (229) (11)
Income tax adjustments (Notes 6 and 7) (192)       180       (192) 180 (3,130)
Total operating and nonoperating special charges, net of income taxes and income tax adjustments $ (172) $ 32 $ 28 $ 33 $ 161 $ 29 $ 272 $ 126 $ (79) $ 588 $ (2,613)