Long-Term Debt - Narrative (Details) $ in Millions	Dec. 31, 2015 USD ($) aircraft
Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Collateral, Number of Aircraft \| aircraft	15
Not designated as hedging instrument \| Fuel hedge contract
Debt Instrument [Line Items]
Derivative, Amount Secured \| $	$ 187

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Balance Type:	na
Period Type:	duration