Chapter 11 Reorganization (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended				0 Months Ended
	Jun. 30, 2013 lease	Jun. 30, 2013 lease	Apr. 15, 2013 debtor node	Jun. 30, 2013 May 31, 2013 Deadline [Member]	Jun. 30, 2013 July 8,2013 Deadline [Member]	Jul. 10, 2013 Subsequent Event [Member] claim	Jul. 10, 2013 Subsequent Event [Member] Claims Filed After Bar Date [Member] claim
Reorganization [Line Items]
Assumed non-residential real property leases (leases)	543	543
Assigned non-residential real property leases (leases)	1	1
Terminated non-residential real property leases (leases)	1	1
Ground leases rejected (leases)	12	12
Ground leases which must be assumed or rejected by an extended date (leases)	14	14
JFK general unsecured claims	$ 171,000,000
JFK general unsecured claims - previously accrued	124,000,000
Number claims filed (claims)						13,500	360
Amount of claims filed						290,000,000,000	66,000,000
Amount of claims expunged by bankruptcy court						116,000,000,000
Amount of claims under review by management						1,100,000,000
Number of debtors (debtors)			20
Number of nodes (nodes)			3
Unsecured claims threshold				190,000,000	190,000,000
Percent of debtors that must accept the plan (percent)			50.00%
Required voting percent in each impaired class (percent)			67.00%
Amount of reorganized debt held by a single holder (percent)	4.50%	4.50%
Support agreement - additional estimated allowed claim amounts		$ 143,000,000