Leases (Details) - B-717-200 Aircraft	3 Months Ended
	Sep. 30, 2015 USD ($) aircraft	Sep. 30, 2012 USD ($)	Jul. 09, 2012 aircraft
Aircraft Type [Line Items]
Lessee	Delta Air Lines, Inc.
Total assets available for lease/sublease, number of units			88
Number of aircraft delivered to sublessee	80
Remaining number of aircraft to be delivered to sublessee	8
Operating lease, number of units	76
Owned assets, number of units	10
Capital leased assets, number of units	2
Contingent payments | $	$ 0
Residual value | $	$ 0
Estimated loss on sublease | $		$ 137,000,000
Operating Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	73
Sales Type Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	5
Direct Financing Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	2
Maximum
Aircraft Type [Line Items]
Sublease terms for leased aircraft	9 years
Lease terms for owned aircraft	7 years
Minimum
Aircraft Type [Line Items]
Sublease terms for leased aircraft	3 years