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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Deferred Revenue Arrangement [Line Items] |  |  |
Passenger revenue | $ 8,149 | $ 7,653 | [1]
Frequent flyer mileage program expiration period after member account inactivity | 18 months |  |
Frequent flyer mileage program period in which miles redeemed | 4 years |  |
Other operating revenue | $ 590 | 535 | [1]
Costs associated with non-travel miles redeemed | 28 | 28 |
Chase and Other Partner Agreements |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Other operating revenue | 482 | 403 |
Deferred Revenue for Miles in Loyalty Program |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Passenger revenue | $ 1,900 | 1,900 |
Minimum |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Frequent flyer mileage program expiration period | 1 year |  |
Maximum |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Frequent flyer mileage program expiration period | 8 years |  |
Passenger Revenue |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Ancillary fees | $ 497 | $ 478 |
[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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