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Commitments - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Aug. 31, 2020
air-craft
Nov. 30, 2020
USD ($)
air-craft
Other Aircraft Commitments Disclosure [Abstract]    
Deposit and Progress Payments | $   $ 830
Lessee Disclosure [Abstract]    
Additional leases not yet commenced, undiscounted future payments | $   $ 1,600
Minimum [Member]    
Lessee Disclosure [Abstract]    
Operating lease commencement date   2021
Maximum [Member]    
Lessee Disclosure [Abstract]    
Operating lease commencement date   2022
B777F [Member]    
Other Aircraft Commitments Disclosure [Abstract]    
Conditional Aircraft Commitments   6
B767F [Member]    
Other Aircraft Commitments Disclosure [Abstract]    
Number of aircrafts rescheduled delivery, 2021 18  
Number of aircrafts rescheduled delivery, 2022 11  
Number of aircrafts rescheduled delivery, 2023 13  
Number of aircrafts rescheduled delivery, 2024 4