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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 12 Months Ended
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Dec. 31, 2019
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, |  |  |  |
| 2019 |  | 2018 |  | 2017
Passenger ticket revenue, including ticket breakage and net of taxes and fees | $ | 6,824 |  |  | $ | 6,482 |  |  | $ | 6,246 |
Passenger ancillary revenue | 567 |  |  | 530 |  |  | 514 |
Mileage Plan passenger revenue | 704 |  |  | 619 |  |  | 541 |
Total passenger revenue | $ | 8,095 |  |  | $ | 7,631 |  |  | $ | 7,301 |
Mileage Plan revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Passenger revenue | $ | 704 |  |  | $ | 619 |  |  | $ | 541 |
Mileage Plan other revenue | 465 |  |  | 434 |  |  | 418 |
Total Mileage Plan revenue | $ | 1,169 |  |  | $ | 1,053 |  |  | $ | 959 |
Cargo and other revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Cargo revenue | $ | 133 |  |  | $ | 129 |  |  | $ | 115 |
Other revenue | 88 |  |  | 70 |  |  | 60 |
Total Cargo and other revenue | $ | 221 |  |  | $ | 199 |  |  | $ | 175 |
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, |  |
| 2019 |  | 2018
Total Deferred Revenue balance at January 1 | $ | 1,874 |  |  | $ | 1,725 |
Travel miles and companion certificate redemption - Passenger revenue | (704) |  |  | (619) |
Miles redeemed on partner airlines - Other revenue | (111) |  |  | (90) |
Increase in liability for mileage credits issued | 931 |  |  | 858 |
Total Deferred Revenue balance at December 31 | $ | 1,990 |  |  | $ | 1,874 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + 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=118956577&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=118956577&loc=SL49130545-203045 + Details
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