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Investment in Unconsolidated Entities (Details 2) (USD $)	0 Months Ended		0 Months Ended						0 Months Ended
	Jan. 06, 2012 Del Amo Fashion Center	Sep. 30, 2013 Consolidated and 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
Acquisitions
Number of properties		18					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
Other than temporary impairment charge			22,400,000
Purchase price of business acquired	$ 50,000,000
Joint venture ownership percentage after transactions	50.00%