Leases (Details) - B-717-200 Aircraft	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) aircraft	Sep. 30, 2012 USD ($)	Jun. 30, 2015 USD ($) aircraft	Dec. 31, 2014 USD ($)	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	71		71
Operating lease, number of units	76		76
Owned assets, number of units	10		10
Capital leased assets, number of units	2		2
Contingent payments | $	$ 0		$ 0
Residual value | $	$ 0		0
Estimated loss on sublease | $		$ 137,000,000
Additional Estimated Loss on Sublease | $			$ (4,000,000)	$ (22,000,000)
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
Operating Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	68		68
Sales Type Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	1		1
Direct Financing Lease [Member]
Aircraft Type [Line Items]
Number of aircraft delivered to sublessee	2		2