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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 |

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