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The Proposed Merger with Spirit Airlines, Inc. (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
Mar. 29, 2022
$ / shares
Feb. 05, 2022
$ / shares
Dec. 31, 2021
$ / shares
Business Acquisition [Line Items]            
Common stock, stated par (in dollars per share) | $ / shares $ 0.001       $ 0.001 $ 0.001
Transaction and merger-related costs $ 11 $ 0        
Spirit Airlines, Inc.            
Business Acquisition [Line Items]            
Common stock, stated par (in dollars per share) | $ / shares         $ 0.0001  
Spirit Airlines, Inc Merger            
Business Acquisition [Line Items]            
Capitalized costs incurred 1          
Spirit Airlines, Inc Merger | Legal, Accounting and Other Fees            
Business Acquisition [Line Items]            
Transaction and merger-related costs 8          
Spirit Airlines, Inc Merger | Retention Bonus            
Business Acquisition [Line Items]            
Transaction and merger-related costs $ 3          
Spirit Airlines, Inc Merger | Forecast            
Business Acquisition [Line Items]            
Business combination exchange ratio     1.9126      
Stock price per share (in dollars per share) | $ / shares     $ 2.13      
Termination fee     $ 94      
Spirit Airlines, Inc Merger | JetBlue Airways            
Business Acquisition [Line Items]            
Stock price per share (in dollars per share) | $ / shares       $ 33.00