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Schedule of Unearned Compensation and Weighted Average Remaining Period for Outstanding Share-Based Awards (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unearned Compensation $ 33 [1]
United Air Lines Inc
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unearned Compensation 18
Continental Airlines Inc
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unearned Compensation $ 15
[1] Compensation cost attributable to future service related to unvested awards remaining to be recognized by United and Continental consists of $18 million and $15 million, respectively.