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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) | 12 Months Ended
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Dec. 31, 2023
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,
| 2023 |  | 2022 |  | 2021
Passenger ticket revenue, net of taxes and fees | $ | 8,016 |  |  | $ | 7,430 |  |  | $ | 4,533 |
Passenger ancillary revenue | 476 |  |  | 447 |  |  | 327 |
Mileage Plan passenger revenue | 1,034 |  |  | 931 |  |  | 639 |
Total Passenger revenue | $ | 9,526 |  |  | $ | 8,808 |  |  | $ | 5,499 |
Mileage Plan revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31,
| 2023 |  | 2022 |  | 2021
Passenger revenue | $ | 1,034 |  |  | $ | 931 |  |  | $ | 639 |
Mileage Plan other revenue | 648 |  |  | 590 |  |  | 461 |
Total Mileage Plan revenue | $ | 1,682 |  |  | $ | 1,521 |  |  | $ | 1,100 |
Cargo and other revenue included in the consolidated statements of operations (in millions):
| Twelve Months Ended December 31,
| 2023 |  | 2022 |  | 2021
Cargo revenue | $ | 128 |  |  | $ | 133 |  |  | $ | 124 |
Other revenue | 124 |  |  | 115 |  |  | 92 |
Total Cargo and other revenue | $ | 252 |  |  | $ | 248 |  |  | $ | 216 |
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,
| 2023 |  | 2022
Total Deferred Revenue balance at January 1 | $ | 2,497 |  |  | $ | 2,358 |
Travel miles and companion certificate redemption - Passenger revenue | (974) |  |  | (878) |
Miles redeemed on partner airlines - Other revenue | (117) |  |  | (65) |
Increase in liability for mileage credits issued | 1,197 |  |  | 1,082 |
Total Deferred Revenue balance at December 31 | $ | 2,603 |  |  | $ | 2,497 |

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- Definition Revenue from Contracts with Customer [Abstract] + References No definition available. + Details
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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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + 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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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