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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cargo revenue | $ | 34 |  |  | $ | 32 |  |  | $ | 60 |  |  | $ | 56 |
Other revenue | 17 |  |  | 16 |  |  | 31 |  |  | 30 |
Total Cargo and other revenue | $ | 51 |  |  | $ | 48 |  |  | $ | 91 |  |  | $ | 86 |
Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Passenger revenue | $ | 167 |  |  | $ | 143 |  |  | $ | 306 |  |  | $ | 271 |
Mileage Plan TM other revenue | 108 |  |  | 109 |  |  | 215 |  |  | 209 |
Total Mileage Plan™ revenue | $ | 275 |  |  | $ | 252 |  |  | $ | 521 |  |  | $ | 480 |
Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 1,693 |  |  | $ | 1,668 |  |  | $ | 3,121 |  |  | $ | 3,026 |
Passenger ancillary revenue | 137 |  |  | 134 |  |  | 255 |  |  | 250 |
Mileage Plan TM passenger revenue | 167 |  |  | 143 |  |  | 306 |  |  | 271 |
Total passenger revenue | $ | 1,997 |  |  | $ | 1,945 |  |  | $ | 3,682 |  |  | $ | 3,547 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
|  | Six Months Ended June 30,
|  | 2018 |  | 2017
Total Deferred Revenue balance at January 1 |  | $ | 1,725 |  |  | $ | 1,534 |
Travel miles and companion certificate redemption - Passenger revenue |  | (306 | ) |  | (271 | )
Miles redeemed on partner airlines - Other revenue |  | (44 | ) |  | (44 | )
Increase in liability for mileage credits issued |  | 402 |  |  | 382 |
Total Deferred Revenue balance at June 30 |  | $ | 1,777 |  |  | $ | 1,601 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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