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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 1,114 |  |  | $ | 222 |  |  | $ | 1,639 |  |  | $ | 1,435 |
Passenger ancillary revenue | 84 |  |  | 31 |  |  | 134 |  |  | 147 |
Mileage Plan passenger revenue | 154 |  |  | 56 |  |  | 238 |  |  | 208 |
Total Passenger revenue | $ | 1,352 |  |  | $ | 309 |  |  | $ | 2,011 |  |  | $ | 1,790 |
Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Passenger revenue | $ | 154 |  |  | $ | 56 |  |  | $ | 238 |  |  | $ | 208 |
Mileage Plan other revenue | 118 |  |  | 73 |  |  | 212 |  |  | 182 |
Total Mileage Plan revenue | $ | 272 |  |  | $ | 129 |  |  | $ | 450 |  |  | $ | 390 |
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cargo revenue | $ | 34 |  |  | $ | 28 |  |  | $ | 61 |  |  | $ | 52 |
Other revenue | 23 |  |  | 11 |  |  | 40 |  |  | 33 |
Total Cargo and other revenue | $ | 57 |  |  | $ | 39 |  |  | $ | 101 |  |  | $ | 85 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
|  |  | Six Months Ended June 30,
|  |  |  |  | 2021 |  | 2020
Total Deferred Revenue balance at January 1 |  |  |  |  | $ | 2,277 |  |  | $ | 1,990 |
Travel miles and companion certificate redemption - Passenger revenue |  |  |  |  | (238) |  |  | (208) |
Miles redeemed on partner airlines - Other revenue |  |  |  |  | (17) |  |  | (21) |
Increase in liability for mileage credits issued |  |  |  |  | 324 |  |  | 313 |
Total Deferred Revenue balance at June 30 |  |  |  |  | $ | 2,346 |  |  | $ | 2,074 |

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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=123351226&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=123351226&loc=SL49130545-203045 + Details
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