Accounts and Notes Receivable and Allowance for Credit Losses - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Nov. 05, 2014 Subsequent Event
Financing Receivable, Recorded Investment, Past Due [Line Items]
Sales of leases to third parties without recourse			$ 7
Gross lease receivables	$ 172	$ 252

Amount of minimum lease payments to be received by the lessor for capital leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

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