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LEASES LEASES - NARRATIVE (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) aircraft | Jun. 30, 2018 USD ($) | Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating Leases, Rent Expense |  |  | $ 137 |  | $ 290 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 3
Lessee Operating Lease Lease Not Yet Commenced Amount |  | $ 52 |  | $ 52 |  |
Sublease Income |  | $ 3 |  | $ 6 |  |
Property Subject to Operating Lease [Member] | B-737 [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 10 |  | 10 |  |
Property Subject to Operating Lease [Member] | Airbus [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 62 |  | 62 |  |
Property Subject to Operating Lease [Member] | Q400 [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 9 |  | 9 |  |
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 32 |  | 32 |  |
Property Available for Operating Lease [Member] | Airbus [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Optional Additional Units | aircraft |  | 1 |  | 1 |  |
Property Available for Operating Lease [Member] | E175 [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Property Subject to or Available for Operating Lease, Number of Optional Additional Units | aircraft |  | 3 |  | 3 |  |
Aircraft [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Variable Lease, Cost |  | $ 1 |  | $ 2 |  |
Airport Facilities [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Variable Lease, Cost |  | $ 61 |  | $ 145 |  |
Retained Earnings [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  | $ 3
Minimum [Member] | CPA Aircraft [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 8 years |  | 8 years |  |
Maximum [Member] | Aircraft [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 12 years |  | 12 years |  |
Maximum [Member] | CPA Aircraft [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 11 years |  | 11 years |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 150 |  |  |  |  |

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