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Commitments And Contingencies (Details)
Mar. 31, 2012
ABN AMRO Bank N.V. Et Al. V. MBIA Inc. Et Al.; Index No. 601475/09 (N.Y. Sup. Ct., N.Y. County) [Member]
  
Commitments And Contingencies [Line Items]  
Number of original plaintiffs 18
Number of plaintiffs dismissed their claims 16
ABN AMRO Bank N.V. Et Al. V. Eric Dinallo Et Al.; Index No. 601846/09 (N.Y. Sup. Ct., N.Y. County) [Member]
  
Commitments And Contingencies [Line Items]  
Number of original plaintiffs 18
Number of plaintiffs dismissed their claims 16