Aggregate number of common shares reserved for future issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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Legal Proceedings (Detail) shares in Millions	1 Months Ended
Legal Proceedings (Detail) shares in Millions	Jun. 30, 2015 Lawsuits	Sep. 30, 2016 shares
Common Stock [Member]
Long-term Purchase Commitment [Line Items]
Shares reserved for future issuance \| shares		25.2
DOJ Antitrust Civil Investigative Demand [Member]
Long-term Purchase Commitment [Line Items]
Number of putative class action lawsuits	100
American Airlines, Inc. [Member] \| DOJ Antitrust Civil Investigative Demand [Member]
Long-term Purchase Commitment [Line Items]
Number of putative class action lawsuits	100