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Schedule of Share-Based Compensation Plan Cost (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 114us-gaap_AllocatedShareBasedCompensationExpense [1] $ 100us-gaap_AllocatedShareBasedCompensationExpense [1] $ 57us-gaap_AllocatedShareBasedCompensationExpense [1]
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 104us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1] 88us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1] 37us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1]
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 10us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [1] 11us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [1] 13us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [1]
Other      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost   $ 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ual_AllOtherMember		 [1] $ 7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ual_AllOtherMember		 [1]
[1] All compensation cost is recorded to Salaries and related costs, with the exception of $3 million, $9 million and $9 million in 2014, 2013 and 2012, respectively, that was recorded in integration-related costs as a component of special charges.