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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended | 40 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 03, 2022 USD ($) aircraft | Sep. 28, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |
Decrease in operating lease liability |  |  | $ 343 |  |  |
Payment Guarantee |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Principal amount of guarantee |  |  |  |  | $ 79 |
Net present value of future principal and interest payments |  |  |  |  | 89 | $ 433
Leaseholds and Leasehold Improvements |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Construction payments |  |  | $ 343 |  |  |
Los Angeles World Airports |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Payments for airport projects |  |  |  |  |  | $ 410
Decrease in operating lease liability |  |  |  | $ (365) |  |
Los Angeles World Airports | Leaseholds and Leasehold Improvements |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Construction payments |  |  |  | $ 365 |  |
Love Field Airport Modernization Corporation | Series 2010 Bonds |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Debt redeemed |  | $ 310 |  |  |  |
Interest expense |  | $ 7 |  |  |  |
Aircraft |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Committed expenditures, year one |  |  |  |  | 1,800 |
Committed expenditures, year two |  |  |  |  | 1,600 |
Committed expenditures, year three |  |  |  |  | 1,100 |
Committed expenditures, year four |  |  |  |  | 837 |
Committed expenditures, year five |  |  |  |  | 961 |
Committed expenditures, year six and beyond |  |  |  |  | $ 6,900 |
Capital Addition Purchase Commitments | Subsequent Event |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Committed expenditures, year one | $ 474 |  |  |  |  |
Committed expenditures, year two | $ 254 |  |  |  |  |
737 MAX 8 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircrafts leased | aircraft |  |  |  |  | 9 |
Number of aircraft orders | aircraft |  |  |  |  | 130 |
Options - 737MAX (in units) | aircraft |  |  |  |  | 238 |
737 MAX 8 | Capital Addition Purchase Commitments | Subsequent Event |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders | aircraft | 12 |  |  |  |  |
737 MAX 7 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders | aircraft |  |  |  |  | 264 |
737 MAX 7 | Capital Addition Purchase Commitments | Subsequent Event |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders | aircraft | 12 |  |  |  |  |

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