Commitments and Contingencies - Narrative (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
USD ($)
numberOfAircraft
| |
| MD-90 Fleet Retirement | |
| Future Purchase Commitments | |
| Accelerated depreciation related to permanent fleet retirement | $ | $ 79 |
| MD-90 | |
| Future Purchase Commitments | |
| Time ahead of plan for fleet retirement (in years) | 2 years |
| Number of aircraft permanently retired | 35 |
| A350-900 | LATAM | |
| Future Purchase Commitments | |
| Number of aircraft agreed to acquire | 4 |
| Number of aircraft commitments planned to be assumed | 10 |