Annual report pursuant to Section 13 and 15(d)

Securitization of Receivables - Additional Information (Detail)

v3.6.0.2
Securitization of Receivables - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Managed receivables $ 3,900,000,000 $ 3,200,000,000  
Securitization credit losses 0 0 $ 0
Asset-backed Securities, Securitized Loans and Receivables [Member]      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Managed receivables $ 2,300,000,000 $ 1,800,000,000  
Minimum [Member]      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Discount rates to determine fair market value of underlying assets 4.00%    
Maximum [Member]      
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Annual servicing fees 0.20%    
Discount rates to determine fair market value of underlying assets 7.00%