Receivable - Carrying Amount of Receivables (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Restricted Receivables	$ 13,876	$ 13,989
Retail note and finance lease receivables [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Restricted Receivables	6,488	6,833
Wholesale [Member]
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Restricted Receivables	$ 7,388	$ 7,156

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

Name:	us-gaap_SecuritizedAssetsAndAnyOtherFinancialAssetsManagedTogetherPrincipalAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant