v3.24.0.1
Commitments - Narrative (Details)
gallon in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
Apr. 30, 2022
USD ($)
gallon
Dec. 31, 2021
Sep. 30, 2023
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
term
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
May 01, 2022
Unrecorded Unconditional Purchase Obligation [Line Items]                  
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements           $ 31      
Number of renewal terms, option one | term           1      
Lease renewal term, one           10 years      
Number of renewal terms, option two | term           2      
Lease renewal term, two           5 years      
2024           $ 5      
2025           5      
2026           5      
Over the remainder of the term           $ 71      
Commitment, sustainable aviation fuel, gallon | gallon   125              
Commitment terms   10 years              
Ratification bonus         $ 8        
Percentage of employees represented by unions under collective bargaining agreements           51.00%      
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year           22.00%      
Employment agreement term of TWU     5 years            
One-time bonus payment $ 95                
Contract extension period 2 years                
Union contract costs       $ 8   $ 105 $ 33 $ 8  
Employment agreement           5 years      
Employment agreement automatic renewal term           5 years      
Renewal notice period           90 days      
Airbus A220                  
Unrecorded Unconditional Purchase Obligation [Line Items]                  
One-time bonus payment   $ 32              
Base pay increase                 3.00%