Commitments and Contingencies - Aircraft Purchase Commitments By Period (Details) - Future aircraft purchase commitments $ in Millions |
Sep. 30, 2020
USD ($)
|
|---|---|
| Future aircraft purchase commitments: | |
| Three months ending December 31, 2020 | $ 380 |
| 2021 | 1,310 |
| 2022 | 2,460 |
| 2023 | 2,310 |
| 2024 | 2,960 |
| Thereafter | 4,810 |
| Total | $ 14,230 |