Annual report pursuant to Section 13 and 15(d)

Analysis of Impaired Finance Receivables (Detail)

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Analysis of Impaired Finance Receivables (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2009
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 51 $ 13
Unpaid Principal Balance 151  
Related Allowance 7  
Average Recorded Investment 77  
Interest Income Recognized     
Impaired loans with related allowance
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 9  
Unpaid Principal Balance 36  
Related Allowance 7  
Average Recorded Investment 14  
Interest Income Recognized     
Impaired loans with no related allowance
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 7  
Unpaid Principal Balance 80  
Average Recorded Investment 12  
Interest Income Recognized     
Impaired loans with U.S. government guarantee
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 35  
Unpaid Principal Balance 35  
Average Recorded Investment 51  
Interest Income Recognized