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Commitments and Contingencies - Summary of Commitments Related to the Acquisition of Aircraft (Details)
$ in Billions
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 6.9
2021 4.3
2022 2.0
2023 1.0
2024 1.2
After 2024 11.3
Total $ 26.7