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Schedule of Adoption of ASC 606 and Expected Impact - Statements of Consolidated Operations (Detail) - USD ($)
$ / shares in Units, $ 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 revenue:                      
Passenger-Mainline                 $ 26,552 $ 25,414 $ 26,333
Passenger-Regional                 5,852 6,043 6,452
Total passenger revenue                 32,404 31,457 32,785
Cargo                 1,035 876 937
Other operating revenue                 4,297 4,223 4,142
Total operating revenue $ 9,438 $ 9,878 $ 10,000 $ 8,420 $ 9,052 $ 9,913 $ 9,396 $ 8,195 37,736 36,556 37,864
Operating expenses                 34,238 32,218 32,698
Operating income 729 1,092 1,399 278 1,005 1,624 1,060 649 3,498 4,338 5,166
Nonoperating expense, net                 (499) (519) (947)
Income before income taxes                 2,999 3,819 4,219
Income tax expense (benefit)                 868 1,556 (3,121)
Net income $ 580 $ 637 $ 818 $ 96 $ 397 $ 965 $ 588 $ 313 $ 2,131 $ 2,263 $ 7,340
Earnings per share, basic $ 1.99 $ 2.12 $ 2.67 $ 0.31 $ 1.26 $ 3.02 $ 1.78 $ 0.88 $ 7.04 $ 6.86 $ 19.52
Earnings per share, diluted $ 1.99 $ 2.12 $ 2.66 $ 0.31 $ 1.26 $ 3.01 $ 1.78 $ 0.88 $ 7.02 $ 6.85 $ 19.47
Operating expense:                      
Salaries and related costs                 $ 11,045 $ 10,275 $ 9,713
Special charges $ 31 $ 50 $ 44 $ 51 $ (31) $ 45 $ 434 $ 190 176 638 326
Nonoperating income (expense):                      
Miscellaneous, net                 3 (19) $ (352)
ASC 606                      
Operating revenue:                      
Passenger-Mainline                 28,259 27,029  
Passenger-Regional                 6,201 6,400  
Total passenger revenue                 34,460 33,429  
Cargo                 1,114 934  
Other operating revenue                 2,210 2,195  
Total operating revenue                 37,784 36,558  
Operating expenses                 34,217 32,206  
Operating income                 3,567 4,352  
Nonoperating expense, net                 (527) (579)  
Income before income taxes                 3,040 3,773  
Income tax expense (benefit)                 896 1,539  
Net income                 $ 2,144 $ 2,234  
Earnings per share, basic                 $ 7.08 $ 6.77  
Earnings per share, diluted                 $ 7.06 $ 6.76  
ASU 2017-07                      
Operating expense:                      
Salaries and related costs                 $ 10,941 $ 10,176  
Special charges                 176 745  
Nonoperating income (expense):                      
Miscellaneous, net                 (101) (11)  
Scenario, Previously Reported | ASC 606                      
Operating revenue:                      
Passenger-Mainline                 26,552 25,414  
Passenger-Regional                 5,852 6,043  
Total passenger revenue                 32,404 31,457  
Cargo                 1,035 876  
Other operating revenue                 4,297 4,223  
Total operating revenue                 37,736 36,556  
Operating expenses                 34,238 32,218  
Operating income                 3,498 4,338  
Nonoperating expense, net                 (499) (519)  
Income before income taxes                 2,999 3,819  
Income tax expense (benefit)                 868 1,556  
Net income                 $ 2,131 $ 2,263  
Earnings per share, basic                 $ 7.04 $ 6.86  
Earnings per share, diluted                 $ 7.02 $ 6.85  
Scenario, Previously Reported | ASU 2017-07                      
Operating expense:                      
Salaries and related costs                 $ 11,045 $ 10,275  
Special charges                 176 638  
Nonoperating income (expense):                      
Miscellaneous, net                 3 (19)  
Adjustment | ASC 606                      
Operating revenue:                      
Passenger-Mainline                 1,707 1,615  
Passenger-Regional                 349 357  
Total passenger revenue                 2,056 1,972  
Cargo                 79 58  
Other operating revenue                 (2,087) (2,028)  
Total operating revenue                 48 2  
Operating expenses                 (21) (12)  
Operating income                 69 14  
Nonoperating expense, net                 (28) (60)  
Income before income taxes                 41 (46)  
Income tax expense (benefit)                 28 (17)  
Net income                 $ 13 $ (29)  
Earnings per share, basic                 $ 0.04 $ (0.09)  
Earnings per share, diluted                 $ 0.04 $ (0.09)  
Adjustment | ASU 2017-07                      
Operating expense:                      
Salaries and related costs                 $ (104) $ (99)  
Special charges                   107  
Nonoperating income (expense):                      
Miscellaneous, net                 $ (104) $ 8