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Variable Interest Entities And Preferred Securities Of Subsidiaries (Tables)
3 Months Ended
Mar. 31, 2012
Entities [Member]
 
Variable Interest Entity [Line Items]  
Activity Between Company And Entities
2001 Financing Entities [Member]
 
Variable Interest Entity [Line Items]  
Activity Between Company And Entities
2002 Financing Entities [Member]
 
Variable Interest Entity [Line Items]  
Activity Between Company And Entities
2007 Financing Entities [Member]
 
Variable Interest Entity [Line Items]  
Activity Between Company And Entities