Fair Value Disclosures (Details) - SPG Units [Member] - $ / shares	Jun. 30, 2020	Dec. 31, 2019	Jan. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-For-Sale Securities Held	0	0
Simon Property Group Common Shares Sold			290,124
SPG Common Shares Average Sales Price			$ 179.52

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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