LEASES - Narratives (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2020
USD ($)
aircraft
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
| Lessee, Lease, Description [Line Items] | |||
| Number of lease aircrafts (aircraft) | 338 | ||
| Number of lease aircrafts, finance (aircraft) | 27 | ||
| Number of lease aircrafts, operating (aircraft) | 17 | ||
| Number of lease aircrafts, short-term (aircraft) | 294 | ||
| Impairment charges for ROU assets | $ | $ 17,000,000 | $ 0 | $ 0 |
| Rent expense related to operating leases | $ | $ 959,000,000 | ||
| Lessee, Finance Lease and Operating Lease, Lease Not Yet Commenced, Amount | $ | $ 184,000,000 | ||
| Minimum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lessee, Lease Term | 1 month | ||
| Maximum | |||
| Lessee, Lease, Description [Line Items] | |||
| Lessee, Lease Term | 140 years | ||
| X | ||||||||||
- Definition Lessee, Finance Lease and Operating Lease, Lease Not Yet Commenced, Amount No definition available.
|
| X | ||||||||||
- Definition Lessee, Lease Term No definition available.
|
| X | ||||||||||
- Definition Number of Leased Aircrafts No definition available.
|
| X | ||||||||||
- Definition Number of Leased Aircrafts, Finance Lease No definition available.
|
| X | ||||||||||
- Definition Number of Leased Aircrafts, Operating Lease No definition available.
|
| X | ||||||||||
- Definition Number of Leased Aircrafts, Short-term No definition available.
|
| X | ||||||||||
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of loss from impairment of right-of-use asset from operating lease. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|