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USD ($)

USD ($) / shares
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Publisher SEC
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 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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USD ($)
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12/31/2010
USD ($)
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USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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USD ($)
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USD ($)
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USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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 -Publisher SEC
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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12/31/2010
USD ($)
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USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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12/31/2010
USD ($)
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{spg_RealEstateAndAccumulatedDepreciationTypeOfPropertyAxis} : Other Properties
12/31/2010
USD ($)
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12/31/2010
USD ($)
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