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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue Recognition [Abstract] |
Disaggregation of Revenue | Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Passenger ticket revenue, including ticket breakage, net of taxes and fees | $ | 1,483 |  |  | $ | 459 |  |  | $ | 3,122 |  |  | $ | 1,894 |
Passenger ancillary revenue | 101 |  |  | 49 |  |  | 235 |  |  | 196 |
Mileage Plan passenger revenue | 190 |  |  | 64 |  |  | 428 |  |  | 272 |
Total Passenger revenue | $ | 1,774 |  |  | $ | 572 |  |  | $ | 3,785 |  |  | $ | 2,362 |
Mileage Plan™ revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Passenger revenue | $ | 190 |  |  | $ | 64 |  |  | $ | 428 |  |  | $ | 272 |
Mileage Plan other revenue | 120 |  |  | 84 |  |  | 332 |  |  | 266 |
Total Mileage Plan revenue | $ | 310 |  |  | $ | 148 |  |  | $ | 760 |  |  | $ | 538 |
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cargo revenue | $ | 34 |  |  | $ | 31 |  |  | $ | 95 |  |  | $ | 83 |
Other revenue | 25 |  |  | 14 |  |  | 65 |  |  | 47 |
Total Cargo and other revenue | $ | 59 |  |  | $ | 45 |  |  | $ | 160 |  |  | $ | 130 |
Contract with Customer Liabilities | The table below presents a roll forward of the total frequent flyer liability (in millions):
|  |  | Nine Months Ended September 30,
|  |  |  |  | 2021 |  | 2020
Total Deferred revenue balance at January 1 |  |  |  |  | $ | 2,277 |  |  | $ | 1,990 |
Travel miles and companion certificate redemption - Passenger revenue |  |  |  |  | (428) |  |  | (272) |
Miles redeemed on partner airlines - Other revenue |  |  |  |  | (30) |  |  | (21) |
Increase in liability for mileage credits issued |  |  |  |  | 531 |  |  | 486 |
Total Deferred revenue balance at September 30 |  |  |  |  | $ | 2,350 |  |  | $ | 2,183 |

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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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