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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Refundable tickets expiration period |  |  |  | 1 year |  |
Revenue | $ 11,003 | $ 9,899 | [1] | $ 30,812 | $ 28,333 | [2]
Frequent flyer mileage program expiration period after member account inactivity |  |  |  | 18 months |  |
Frequent flyer mileage program period in which miles redeemed |  |  |  | 2 years |  |
Passenger Revenue |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Ancillary fees | 572 | 538 |  | $ 1,600 | 1,500 |
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 |  |
Deferred Revenue for Miles in Loyalty Program |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Advance tickets expiration period |  |  |  | 12 months |  |
Passenger revenue |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Revenue | 10,120 | 9,069 | [1] | $ 28,150 | 25,873 | [2]
Passenger revenue | Deferred Revenue for Miles in Loyalty Program |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Revenue | 3,200 | 2,900 |  | 2,300 | 2,300 |
Other operating revenue |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Revenue | 587 | 551 | [1] | 1,759 | 1,670 | [2]
Other operating revenue | Chase and Other Partner Agreements |  |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |  |
Revenue | $ 480 | $ 441 |  | $ 1,500 | $ 1,300 |
[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.
[2] | 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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