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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 525 |  |  | $ | 1,213 |  |  |  |  |
Passenger ancillary revenue | 50 |  |  | 116 |  |  |  |  |
Mileage Plan passenger revenue | 84 |  |  | 152 |  |  |  |  |
Total Passenger revenue | $ | 659 |  |  | $ | 1,481 |  |  |  |  |
Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Passenger revenue | $ | 84 |  |  | $ | 152 |  |  |  |  |
Mileage Plan other revenue | 94 |  |  | 109 |  |  |  |  |
Total Mileage Plan revenue | $ | 178 |  |  | $ | 261 |  |  |  |  |
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Cargo revenue | $ | 27 |  |  | $ | 24 |  |  |  |  |
Other revenue | 17 |  |  | 22 |  |  |  |  |
Total Cargo and other revenue | $ | 44 |  |  | $ | 46 |  |  |  |  |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Total Deferred Revenue balance at January 1 |  |  |  |  | $ | 2,277 |  |  | $ | 1,990 |
Travel miles and companion certificate redemption - Passenger revenue |  |  |  |  | (84) |  |  | (152) |
Miles redeemed on partner airlines - Other revenue |  |  |  |  | (4) |  |  | (22) |
Increase in liability for mileage credits issued |  |  |  |  | 136 |  |  | 207 |
Total Deferred Revenue balance at March 31 |  |  |  |  | $ | 2,325 |  |  | $ | 2,023 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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