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Business Segments - Schedule of Comparison of Approximate Sales Mix in Principal Product Categories (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total Revenues
Total Revenues	$ 1,006us-gaap_Revenues	$ 1,070us-gaap_Revenues	$ 952us-gaap_Revenues	$ 1,077us-gaap_Revenues	$ 1,041us-gaap_Revenues	$ 1,113us-gaap_Revenues	$ 1,070us-gaap_Revenues	$ 1,072us-gaap_Revenues	$ 4,105us-gaap_Revenues	$ 4,296us-gaap_Revenues	$ 3,414us-gaap_Revenues
Drilling and Production [Member]
Total Revenues
Total Revenues									991us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ExplorationAndProductionEquipmentMember	987us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ExplorationAndProductionEquipmentMember	860us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ExplorationAndProductionEquipmentMember
Pipe [Member]
Total Revenues
Total Revenues									723us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PipelinesMember	845us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PipelinesMember	621us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PipelinesMember
Valves [Member]
Total Revenues
Total Revenues									801us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValveSystemsAndControlsMember	839us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValveSystemsAndControlsMember	569us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValveSystemsAndControlsMember
Fittings and Flanges [Member]
Total Revenues
Total Revenues									667us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValvesFittingsFlangesAndAllOtherProductsMember	664us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValvesFittingsFlangesAndAllOtherProductsMember	522us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_ValvesFittingsFlangesAndAllOtherProductsMember
Mill Tool, MRO, Safety and Other [Member]
Total Revenues
Total Revenues									$ 923us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_MillsMember	$ 961us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_MillsMember	$ 842us-gaap_Revenues / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dnow_MillsMember

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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