Quarterly report pursuant to Section 13 or 15(d)

Securitization of Receivables - Summary of Certain Transactions with Securitization Trusts (Detail)

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Securitization of Receivables - Summary of Certain Transactions with Securitization Trusts (Detail) - Securitization Trust [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Gains on securitizations $ 13 $ 6
Purchase of receivables securitized 394 219
Proceeds from securitizations 407 225
Cash received from residual and servicing assets 2 1
Residual Assets [Member]    
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]    
Residual and servicing assets included in Other Assets $ 18 $ 9