Summary of Significant Accounting Policies (Details) - ASU No. 2014-09 - Scenario, Forecast $ in Billions	Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected increase in passenger revenue upon adoption of new accounting standard	$ 2
Expected decrease in other revenue upon adoption of new accounting standard	$ 2

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.

No definition available.

Name:	us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration