v3.24.0.1
Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]      
Advertising expense $ 66 $ 59 $ 45
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Term of contract under loyalty program 1 year    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Term of contract under loyalty program 10 years    
Computer software, intangible asset      
Finite-Lived Intangible Assets [Line Items]      
Useful life of software 5 years    
Capitalized computer software, net $ 157 123  
Amortization expense 62 51 $ 45
High density airports, take-off and landing slots      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets, net (excluding goodwill) 139 $ 139  
JMP Holdings, LLC      
Finite-Lived Intangible Assets [Line Items]      
Restricted cash $ 65    
Ownership percentage, noncontrolling interest 5.00%    
TWA Flight Center Hotel      
Finite-Lived Intangible Assets [Line Items]      
Ownership percentage, noncontrolling interest 10.00%