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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Passenger revenue | $ 8,149 | $ 7,653 | [1]
Cargo | 293 | 238 | [1]
Other operating revenue | 590 | 535 | [1]
Total operating revenue | 9,032 | 8,426 | [1]
Salaries and related costs | 2,726 | 2,636 | [1]
Distribution expenses | 342 | 319 | [1]
Other operating expenses | 1,398 | 1,309 | [1]
Total operating expenses | 8,756 | 8,106 | [1]
Operating income | 276 | 320 | [1]
Interest expense | (176) | (162) | [1]
Miscellaneous, net | 48 | (42) | [1]
Total nonoperating expense, net | (92) | (170) | [1]
Income before income taxes | 184 | 150 | [1]
Income tax expense | 37 | 51 | [1]
Net income | $ 147 | $ 99 | [1]
Earnings per share, basic and diluted | $ 0.52 | $ 0.32 | [1]
ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Passenger revenue |  | $ 7,653 |
Cargo |  | 238 |
Other operating revenue |  | 535 |
Total operating revenue |  | 8,426 |
Salaries and related costs |  | 2,636 |
Distribution expenses |  | 319 |
Other operating expenses |  | 1,309 |
Total operating expenses |  | 8,106 |
Operating income |  | 320 |
Interest expense |  | (162) |
Miscellaneous, net |  | (42) |
Total nonoperating expense, net |  | (170) |
Income before income taxes |  | 150 |
Income tax expense |  | 51 |
Net income |  | $ 99 |
Earnings per share, basic and diluted |  | $ 0.32 |
Scenario, Previously Reported | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Passenger revenue |  | $ 7,174 |
Cargo |  | 220 |
Other operating revenue |  | 1,026 |
Total operating revenue |  | 8,420 |
Salaries and related costs |  | 2,661 |
Distribution expenses |  | 307 |
Other operating expenses |  | 1,332 |
Total operating expenses |  | 8,142 |
Operating income |  | 278 |
Interest expense |  | (150) |
Miscellaneous, net |  | (17) |
Total nonoperating expense, net |  | (133) |
Income before income taxes |  | 145 |
Income tax expense |  | 49 |
Net income |  | $ 96 |
Earnings per share, basic and diluted |  | $ 0.31 |
Adjustment | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Passenger revenue |  | $ 479 |
Cargo |  | 18 |
Other operating revenue |  | (491) |
Total operating revenue |  | 6 |
Distribution expenses |  | 12 |
Other operating expenses |  | (23) |
Total operating expenses |  | (11) |
Operating income |  | 17 |
Interest expense |  | (12) |
Total nonoperating expense, net |  | (12) |
Income before income taxes |  | 5 |
Income tax expense |  | 2 |
Net income |  | $ 3 |
Earnings per share, basic and diluted |  | $ 0.01 |
New Retirement Standard Adjustments | ASC 606 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Salaries and related costs |  | $ (25) |
Total operating expenses |  | (25) |
Operating income |  | 25 |
Miscellaneous, net |  | (25) |
Total nonoperating expense, net |  | $ (25) |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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