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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Details) | 12 Months Ended | 20 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) aircraft
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Rent expense |  | $ 619,000,000 |
Payments for Construction in Process |  |  | $ 24,000,000
LAX Construction, Amount Reimbursed |  |  | 8,700,000
LAX Redevelopment Project, Total Expected Outlay | $ 230,000,000 |  | 230,000,000
Virgin America Flight Attendants [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Loss Contingency, Damages Sought, Value | 78,000,000 |  |
Loss Contingency, Damages Sought, Value | 78,000,000 |  |
Aircraft Commitments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
2021 | 873,000,000 |  | 873,000,000
2022 | 372,000,000 |  | 372,000,000
2023 | 238,000,000 |  | 238,000,000
2024 | 27,000,000 |  | 27,000,000
2025 | 16,000,000 |  | 16,000,000
Thereafter | 13,000,000 |  | 13,000,000
Total | 1,539,000,000 |  | 1,539,000,000
Capacity Purchase Agreements[Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
2021 | 166,000,000 |  | 166,000,000
2022 | 174,000,000 |  | 174,000,000
2023 | 179,000,000 |  | 179,000,000
2024 | 184,000,000 |  | 184,000,000
2025 | 189,000,000 |  | 189,000,000
Thereafter | 690,000,000 |  | 690,000,000
Total | $ 1,582,000,000 |  | $ 1,582,000,000
B737 |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Commited to purchase (in aircraft) | aircraft | 32 |  | 32
Option to purchase additional (in aircraft) | aircraft | 37 |  | 37
A-320-Neo [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Option to purchase additional (in aircraft) | aircraft | 30 |  | 30
B737 MAX [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Commited to purchase (in aircraft) | aircraft | 23 |  | 23
Option to purchase additional (in aircraft) | aircraft | 15 |  | 15
E175 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Commited to purchase (in aircraft) | aircraft | 3 |  | 3
Option to purchase additional (in aircraft) | aircraft | 30 |  | 30
Capacity Purchase Agreement with SkyWest [Member] | E175 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Property Subject to or Available for Operating Lease, Number of Optional Additional Units | aircraft | 8 |  | 8
Property Subject to Operating Lease [Member] | B737 |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 10 |  | 10
Property Subject to Operating Lease [Member] | Q400 |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 7 |  | 7
Property Subject to Operating Lease [Member] | Airbus |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 71 |  | 71
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 32 |  | 32

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