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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Rent expense |  | $ 619 | $ 552
Virgin America Flight Attendants [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Loss Contingency, Damages Sought, Value | $ 78 |  |
Loss Contingency, Damages Sought, Value | 78 |  |
Aircraft Commitments [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
2020 | 531 |  |
2021 | 487 |  |
2022 | 347 |  |
2023 | 206 |  |
2024 | 31 |  |
Thereafter | 26 |  |
Total | 1,628 |  |
Capacity Purchase Agreements[Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
2020 | 145 |  |
2021 | 166 |  |
2022 | 174 |  |
2023 | 179 |  |
2024 | 184 |  |
Thereafter | 880 |  |
Total | $ 1,728 |  |
B737 |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Commited to purchase (in aircraft) | aircraft | 32 |  |
Option to purchase additional (in aircraft) | aircraft | 37 |  |
A-320-Neo [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Option to purchase additional (in aircraft) | aircraft | 30 |  |
E175 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Commited to purchase (in aircraft) | aircraft | 3 |  |
Option to purchase additional (in aircraft) | aircraft | 30 |  |
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 [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 7 | 9 |
Property Subject to Operating Lease [Member] | Airbus [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft | 61 | 61 |
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 |
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 |  |
Aircraft Maintenance Deposits [Member] |  |  |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] |  |  |
2020 | $ 73 |  |
2021 | 62 |  |
2022 | 51 |  |
2023 | 26 |  |
2024 | 6 |  |
Thereafter | 2 |  |
Total | $ 220 |  |

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