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Revenue - Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Mainline | $ 8,045 | $ 7,492 |  | $ 14,661 | $ 13,719 |
Regional | 1,835 | 1,659 |  | 3,369 | 3,085 |
Total passenger revenue | 9,880 | 9,151 | [1] | 18,030 | 16,804 | [1]
International |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total passenger revenue | 3,699 | 3,493 |  | 6,880 | 6,495 |
Domestic |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Mainline | 4,395 | 4,043 |  | 7,881 | 7,315 |
Regional | 1,786 | 1,615 |  | 3,269 | 2,994 |
Total passenger revenue | 6,181 | 5,658 |  | 11,150 | 10,309 |
Atlantic |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total passenger revenue | 1,824 | 1,615 |  | 3,076 | 2,732 |
Pacific |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total passenger revenue | 1,103 | 1,064 |  | 2,172 | 2,117 |
Latin America |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Total passenger revenue | $ 772 | $ 814 |  | $ 1,632 | $ 1,646 |
[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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- Definition A transportation (plane, train, ship) carrier's fare revenue recognized in the period from carrying passengers between destinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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