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Investments in Unconsolidated Entities (Details 2) (USD $)	3 Months Ended	0 Months Ended			0 Months Ended						0 Months Ended
	Dec. 31, 2011 Dissolved Joint Venture Partnership	Jan. 06, 2012 Del Amo Fashion Center	Dec. 31, 2013 Consolidated and unconsolidated property interests property	Sep. 30, 2011 Unconsolidated property interests property	Mar. 22, 2012 TMLP 2012 acquisition	Mar. 22, 2012 TMLP 2012 acquisition TMLP Senior Loan Facility	Mar. 22, 2012 TMLP 2012 acquisition TMLP Trust Preferred Securities	Mar. 22, 2012 TMLP 2012 acquisition SPG-FCM Loan	Mar. 22, 2012 TMLP 2012 acquisition Consolidated and unconsolidated property interests property	Mar. 22, 2012 TMLP 2012 acquisition Unconsolidated property interests property	Mar. 22, 2012 TMLP 2012 acquisition Consolidated property interests property
Business acquisition
Number of properties			18	9					26	16	9
Transaction value					$ 1,500,000,000
Repayment of TMLP senior loan facility						562,100,000	100,000,000
Debt extinguished, noncash								558,400,000
Mortgage debt assumed, consolidated					2,600,000,000
Gain due to acquisition of controlling interest											488,700,000
Gain due to acquisition of controlling interest	168,300,000
Other than temporary impairment charge					22,400,000
Purchase price of business acquired		$ 50,000,000
Joint venture ownership percentage after transactions		50.00%
Joint venture ownership percentage	50.00%
Joint venture ownership percentage before transaction		25.00%