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Commitments and Contingencies (Details)
$ in Millions
1 Months Ended
Apr. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
aircraft
May 01, 2022
Apr. 30, 2021
airport
Unrecorded Unconditional Purchase Obligation [Line Items]        
Remainder of fiscal year 2022   $ 245    
2023   1,500    
2024   2,100    
2025   1,800    
2026   1,400    
Thereafter   1,000    
Restricted assets pledged under letter of credit   40    
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements   $ 40    
Number of northeast airports | airport       4
A-321 Neo        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Unrecorded unconditional purchase obligations disclosure | aircraft   63    
A220-300        
Unrecorded Unconditional Purchase Obligation [Line Items]        
Unrecorded unconditional purchase obligations disclosure | aircraft   88    
One-time bonus payment $ 32      
Base pay increase     3.00%