Advanced Purchase of Miles - Additional Information (Detail)	Dec. 31, 2015 USD ($)
United Airlines, Inc. \| Co-Brand Agreement \| Maximum \| Advanced Purchase of Miles
Airline Products and Services [Line Items]
Repurchase of pre-purchased miles from Chase in 2016	$ 249,000,000

Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308

Name:	us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant