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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Refundable tickets expiration period |  |  |  | 1 year |  |
Passenger revenue | $ 9,880 | $ 9,151 | [1] | $ 18,030 | $ 16,804 | [1]
Frequent flyer mileage program expiration period after member account inactivity |  |  |  | 18 months |  |
Frequent flyer mileage program period in which miles redeemed |  |  |  | 2 years |  |
Other operating revenue | 583 | 584 | [1] | $ 1,172 | 1,119 | [1]
Chase and Other Partner Agreements |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Other operating revenue | 480 | 459 |  | 974 | 873 |
Deferred Revenue for Miles in Loyalty Program |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Passenger revenue | 2,700 | $ 2,600 |  | $ 2,200 | 2,200 |
Advance tickets expiration period |  |  |  | 12 months |  |
Deferred revenue, period to be recognized |  | 12 months |  |  |  |
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 | $ 555 | $ 524 |  | $ 1,052 | $ 1,002 |
[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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