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Commitments and Contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2023
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Feb. 28, 2023
lawsuit
Dec. 31, 2022
lawsuit
Apr. 30, 2021
airport
Unrecorded Unconditional Purchase Obligation [Line Items]                  
Restricted assets pledged under letter of credit   $ 52     $ 52        
Letters of credit   65     65        
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements   29     29        
Number of northeast airports | airport                 4
Collective bargaining agreement contract extension period 2 years                
Union contract costs   $ 0 $ 95 $ 32 $ 95 $ 32      
Employment agreement term         5 years        
Automatic renewal term, employment agreement, term         5 years        
Renewal notice period, employment agreement, period         90 days        
Loss contingency, pending claims, number | lawsuit             4 4  
JFK Millennium Partner LLC                  
Unrecorded Unconditional Purchase Obligation [Line Items]                  
Ownership percentage   5.00%     5.00%