Leases (Details) (B717 Aircraft, USD $)	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Jul. 09, 2012 aircraft
Aircraft Type [Line Items]
Lessee	Delta Air Lines, Inc.
Total assets available for lease/sublease, number of units			88
Operating lease, number of units			78
Owned assets, number of units			8
Capital leased assets, number of units			2
Lease terms for owned aircraft	7 years
Contingent payments	$ 0
Residual value	0
Estimated loss on sublease		137,000,000
Contingent termination penalties	$ 106,000,000
Maximum
Aircraft Type [Line Items]
Sublease terms for leased aircraft	12 years
Minimum
Aircraft Type [Line Items]
Sublease terms for leased aircraft	6 years