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Non-Consolidated Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Prlp2011 Holdings Llc Joint Venture [Member]
   
Variable Interest Entity [Line Items]   
Non-consolidated VIEs, description of maximum lossThe Corporation determined that under a maximum exposure to loss worst case scenario the carrying amount of the acquisition loan, the advances on the advance facility and working capital line, if any, and the equity interest held by the Corporation at September 30, 2011 will not be recovered.  
Ownership interest24.90%  
Equity Method Investment, Underlying Equity in Net Assets$ 16  
Loans Receivable, Description of Variable Rate Basis5-year maturity and bears a variable interest at 30-day LIBOR plus 300 basis points  
Variable Interest Entity, Qualitative or Quantitative Information, Size of VIEIn September of 2011, BPPR sold construction and commercial real estate loans with a fair value of $148 million  
Purchase Price Of Loans57.00%  
Financed Closing Costs2  
Carrying Amount Of Acquisition Loan Before Financed Closing Costs84  
Carrying Amount Of Acquisition Loan After Financed Closing Costs86  
Total Working Capital Line20  
Total Advance Facility68.5  
Cash Received From Investee48  
Net Equity Of Investee63  
Fair Value Of Loans Sold148  
Fnma Gnma Vie [Member]
   
Variable Interest Entity [Line Items]   
Non-consolidated VIEs, unpaid principal balance of loans serviced$ 9,400$ 9,300$ 9,400
Non-consolidated VIEs, description of maximum lossMaximum exposure to loss represents the maximum loss, under a worst case scenario, that would be incurred by the Corporation, as servicer for the VIEs, assuming all loans serviced are delinquent and that the value of the Corporation’s interests and any associated collateral declines to zero, without any consideration of recovery.