Chapter 11 Reorganization (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Reorganization [Line Items]
Support agreement - additional estimated allowed claim amounts	$ 127,000,000
Assumed Non-Residential Real Property Leases	537
Ground leases rejected	12
Ground Leases Which Must Be Assumed or Rejected by an Extended Date	24
Bankruptcy Claims, Number Claims Filed	13,400
Bankruptcy Claims, Amount of Claims Filed	290,000,000,000
Bankruptcy Claims, Amount of Claims Expunged by Bankruptcy Court	100,200,000,000
Bankruptcy Claims, Amount of Claims under Review by Management	16,100,000,000
Unsecured claims threshold	190,000,000
Substantial Equity Holder Ownership Percentage Threshold	4.50%
Support agreement - additional allowed interest expense	116,000,000
Claims Filed After Bar Date [Member]
Reorganization [Line Items]
Bankruptcy Claims, Number Claims Filed	350
Bankruptcy Claims, Amount of Claims Filed	$ 58,000,000