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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Passenger revenue | $ | 186 |  |  | $ | 153 |  |  | $ | 511 |  |  | $ | 459 |
Mileage Plan other revenue | 118 |  |  | 114 |  |  | 346 |  |  | 329 |
Total Mileage Plan revenue | $ | 304 |  |  | $ | 267 |  |  | $ | 857 |  |  | $ | 788 |
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Cargo revenue | $ | 36 |  |  | $ | 36 |  |  | $ | 104 |  |  | $ | 96 |
Other revenue | 24 |  |  | 19 |  |  | 65 |  |  | 51 |
Total Cargo and other revenue | $ | 60 |  |  | $ | 55 |  |  | $ | 169 |  |  | $ | 147 |
Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 1,868 |  |  | $ | 1,744 |  |  | $ | 5,099 |  |  | $ | 4,864 |
Passenger ancillary revenue | 157 |  |  | 146 |  |  | 428 |  |  | 401 |
Mileage Plan passenger revenue | 186 |  |  | 153 |  |  | 511 |  |  | 459 |
Total Passenger revenue | $ | 2,211 |  |  | $ | 2,043 |  |  | $ | 6,038 |  |  | $ | 5,724 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
|  | Nine Months Ended September 30,
|  | 2019 |  | 2018
Total Deferred Revenue balance at January 1 |  | $ | 1,874 |  |  | $ | 1,725 |
Travel miles and companion certificate redemption - Passenger revenue |  | (511 | ) |  | (459 | )
Miles redeemed on partner airlines - Other revenue |  | (84 | ) |  | (66 | )
Increase in liability for mileage credits issued |  | 692 |  |  | 631 |
Total Deferred Revenue balance at September 30 |  | $ | 1,971 |  |  | $ | 1,831 |

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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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