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LEASES - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft | Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft | Dec. 31, 2021 USD ($) | Dec. 05, 2022 aircraft
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  | $ 3,520,000,000 | $ 3,924,000,000 | $ 505,000,000 |
Payments of long-term debt and finance lease obligations |  |  |  | 85,000,000 | 2,437,000,000 | $ 612,000,000 |
Total lease obligations |  | $ 189,000,000 | $ 104,000,000 | $ 104,000,000 | $ 189,000,000 |  |
Airport-Related |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Term of lease contract (in years) |  |  | 37 years | 37 years |  |  |
Boeing 737-700 | Aircraft |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Number of aircrafts to be purchased | aircraft |  |  | 4 | 4 |  |  |
Number of aircrafts purchased | aircraft | 8 | 31 |  |  | 31 |  | 39
Capital expenditures | $ 88,000,000 | $ 365,000,000 | $ 44,000,000 |  |  |  |
Payments of long-term debt and finance lease obligations | 50,000,000 | 191,000,000 |  | $ 3,000,000 |  |  |
Total lease obligations | $ 38,000,000 | $ 174,000,000 | $ 41,000,000 | $ 41,000,000 | $ 174,000,000 |  |
Number of leased aircrafts | aircraft |  |  | 24 | 24 |  |  |
Gain (loss) on sale of aircrafts |  |  |  | $ 0 |  |  |
Minimum | Aircraft |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Renewal term (in years) |  |  |  | 3 months |  |  |
Minimum | Other |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Renewal term (in years) |  |  |  | 6 months |  |  |
Minimum | Airport-Related |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Renewal term (in years) |  |  | 1 year | 1 year |  |  |
Maximum | Aircraft |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Term of contract (in years) |  |  |  | 10 years |  |  |
Renewal term (in years) |  |  |  | 3 years |  |  |
Maximum | Other |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Term of contract (in years) |  |  |  | 3 years |  |  |
Renewal term (in years) |  |  |  | 1 year |  |  |
Maximum | Airport-Related |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Renewal term (in years) |  |  | 11 years | 11 years |  |  |

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