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Merger - Additional Information (Detail) (USD $)
In Billions, except Share data, unless otherwise specified
1 Months Ended
Oct. 31, 2010
Sep. 30, 2010
Business Acquisition [Line Items]    
Shares of UAL common stock issued 148,000,000  
Closing price of common stock   $ 23.66
Aggregate value of consideration paid for merger   $ 3.7
Continental Airlines Inc
   
Business Acquisition [Line Items]    
Exchangeable share of Common stock converted 1.05