Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]      
Gains on securitizations $ 17 $ 8 $ 9
Purchase of receivables securitized 532 286 248
Proceeds from securitizations 549 294 257
Cash received from residual and servicing assets 2 2 2
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 $ 19 $ 9 $ 6