Spin-off of Distribution Business - Additional Information (Detail) (Now Inc [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended
May 22, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Now Inc [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ratio of common stock sharing	4
Other costs		$ 25		$ 34
Sales prior to the spin-off		91	116	231	225
Purchases prior to the spin-off		$ 32	$ 32	$ 82	$ 63

For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are initially classified as discontinued, the amounts of intercompany revenue that were previously eliminated in consolidation for periods before the disposal transaction (in situations where revenue and cost producing activities with the disposed component will continue after disposal).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1518-107760

Name:	us-gaap_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration