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Commitments - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
Apr. 30, 2022
USD ($)
Dec. 31, 2024
USD ($)
term
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 01, 2022
Unrecorded Unconditional Purchase Obligation [Line Items]            
Restricted assets pledged under letter of credit     $ 89      
Letters of credit outstanding, amount     61      
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements     $ 12      
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      
2025     $ 5      
2026     5      
2027     5      
Over the remainder of the term     $ 66      
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     23.00%      
One-time bonus payment $ 95          
Contract extension period 2 years          
Union contract costs $ 26   $ 26 $ 105 $ 33  
Employment agreement     5 years      
Employment agreement automatic renewal term     5 years      
Renewal notice period     90 days      
JMP Holdings, LLC            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Restricted cash     $ 65      
Ownership percentage, noncontrolling interest     5.00%      
Airbus A220            
Unrecorded Unconditional Purchase Obligation [Line Items]            
One-time bonus payment   $ 32        
Base pay increase           3.00%