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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Summary of Roll Forward of Frequent Flyer Deferred Revenue | The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Total Frequent flyer deferred revenue - beginning balance | $ | 4,937 |  |  | $ | 4,940 |  |  | $ | 4,783 |  |  | $ | 4,889 |
Total miles awarded | 607 |  |  | 531 |  |  | 1,210 |  |  | 1,019 |
Travel miles redeemed (Passenger revenue) | (519 | ) |  | (535 | ) |  | (928 | ) |  | (933 | )
Non-travel miles redeemed (Other operating revenue) | (36 | ) |  | (45 | ) |  | (76 | ) |  | (84 | )
Total Frequent flyer deferred revenue - ending balance | $ | 4,989 |  |  | $ | 4,891 |  |  | $ | 4,989 |  |  | $ | 4,891 |
Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional | The following table presents passenger revenue by geographic region and by mainline versus regional for the three and six months ended June 30 (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Mainline | $ | 4,395 |  |  | $ | 4,043 |  |  | $ | 7,881 |  |  | $ | 7,315 |
Regional | 1,786 |  |  | 1,615 |  |  | 3,269 |  |  | 2,994 |
Domestic | 6,181 |  |  | 5,658 |  |  | 11,150 |  |  | 10,309 |
Atlantic | 1,824 |  |  | 1,615 |  |  | 3,076 |  |  | 2,732 |
Pacific | 1,103 |  |  | 1,064 |  |  | 2,172 |  |  | 2,117 |
Latin America | 772 |  |  | 814 |  |  | 1,632 |  |  | 1,646 |
International | 3,699 |  |  | 3,493 |  |  | 6,880 |  |  | 6,495 |
Consolidated | $ | 9,880 |  |  | $ | 9,151 |  |  | $ | 18,030 |  |  | $ | 16,804 |
Mainline | 8,045 |  |  | 7,492 |  |  | 14,661 |  |  | 13,719 |
Regional | 1,835 |  |  | 1,659 |  |  | 3,369 |  |  | 3,085 |
Consolidated | $ | 9,880 |  |  | $ | 9,151 |  |  | $ | 18,030 |  |  | $ | 16,804 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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