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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contracts with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | Passenger revenue recognized in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31,
| 2020 |  | 2019 |  | 2018
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 2,428 |  |  | $ | 6,824 |  |  | $ | 6,482 |
Passenger ancillary revenue | 245 |  |  | 567 |  |  | 530 |
Mileage Plan passenger revenue | 346 |  |  | 704 |  |  | 619 |
Total passenger revenue | $ | 3,019 |  |  | $ | 8,095 |  |  | $ | 7,631 |
Mileage Plan revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31,
| 2020 |  | 2019 |  | 2018
Passenger revenue | $ | 346 |  |  | $ | 704 |  |  | $ | 619 |
Mileage Plan other revenue | 374 |  |  | 465 |  |  | 434 |
Total Mileage Plan revenue | $ | 720 |  |  | $ | 1,169 |  |  | $ | 1,053 |
Cargo and other revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31,
| 2020 |  | 2019 |  | 2018
Cargo revenue | $ | 112 |  |  | $ | 133 |  |  | $ | 129 |
Other revenue | 61 |  |  | 88 |  |  | 70 |
Total Cargo and other revenue | $ | 173 |  |  | $ | 221 |  |  | $ | 199 |
Contract with Customer, Asset and Liability [Table Text Block] | The table below presents a roll forward of the total frequent flyer liability (in millions):
| Twelve Months Ended December 31,
| 2020 |  | 2019
Total Deferred Revenue balance at January 1 | $ | 1,990 |  |  | $ | 1,874 |
Travel miles and companion certificate redemption - Passenger revenue | (346) |  |  | (704) |
Miles redeemed on partner airlines - Other revenue | (23) |  |  | (111) |
Increase in liability for mileage credits issued | 656 |  |  | 931 |
Total Deferred Revenue balance at December 31 | $ | 2,277 |  |  | $ | 1,990 |

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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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