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v3.19.3.a.u2

LEASES - NARRATIVE (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) | Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 3 |  |
Sublease Income |  | 13 |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  | 176 |  |
Operating Lease, Payments |  | $ 347 |  |
Rent expense |  |  | $ 619 | $ 552
Property Subject to Operating Lease [Member] | Airbus [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft |  | 61 | 61 |
Property Subject to Operating Lease [Member] | Q400 [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft |  | 7 | 9 |
Property Subject to Operating Lease [Member] | E175 [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft |  | 32 | 32 |
Property Subject to Operating Lease [Member] | B737 |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, number of leased assets (in aircraft) | aircraft |  | 10 | 10 |
Airport Facilities [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Variable Lease, Cost |  | $ 322 |  |
Aircraft Leases [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Variable Lease, Cost |  | $ 4 |  |
Aircraft Leases [Member] | Maximum [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 12 years |  |
Corporate real estate [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Variable Lease, Cost |  | $ 10 |  |
CPA Aircraft [Member] | Maximum [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 11 years |  |
CPA Aircraft [Member] | Minimum [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lessee, Operating Lease, Term of Contract |  | 7 years 6 months |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Derecognition of Build-to-suit Accounting | $ 150 |  |  |
Retained Earnings |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 3 |  |

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