Document and Entity Information	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Entity Registrant Name	SIMON PROPERTY GROUP INC /DE/
Entity Central Index Key	0001063761
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Common stock.
Entity Common Stock, Shares Outstanding | shares	312,194,210
Entity Listing, Par Value Per Share | $ / shares	$ 0.0001
Class B common stock
Entity Common Stock, Shares Outstanding | shares	8,000
Entity Listing, Par Value Per Share | $ / shares	$ 0.0001