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Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 Frequent Flyer	Dec. 31, 2013 United Airlines, Inc.
Significant Accounting Policies [Line Items]
Estimated impact of change on consolidated revenue	$ 75
Receivable from related parties		$ 232

Amounts due from owners or affiliates of the reporting entity related to issuance of the entity's capital stock before cash payment is received (does not include amounts due from officers or directors). This element would also include the receivable for proceeds from the issuance of shares under employee stock option exercises which proceeds have not been received as of the reporting date due to the timing of the transaction date versus the settlement date.

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