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Related Party Transactions - Schedule of Components of Changes in NOV Net Investment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Abstract]
Net contribution from (distributions to) NOV per the consolidated statements of stockholders' equity	$ 138dnow_NetTransfersFromToParent	$ (151)dnow_NetTransfersFromToParent	$ 1,293dnow_NetTransfersFromToParent
Non-cash adjustments:
Stock-based compensation	(5)us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Net transfer of assets and liabilities from NOV	(8)dnow_NetTransferOfAssetsAndLiabilitiesWithParentCompany
Less: Net income attributable to NOV net investment prior to the Spin-off	(58)dnow_NetIncomeLossPriorToSeparation	(147)dnow_NetIncomeLossPriorToSeparation	(108)dnow_NetIncomeLossPriorToSeparation
Net contributions from (distributions to) NOV per the consolidated statements of cash flows	$ 67us-gaap_ProceedsFromContributionsFromParent	$ (298)us-gaap_ProceedsFromContributionsFromParent	$ 1,185us-gaap_ProceedsFromContributionsFromParent

X

- Definition

Net Income Loss Prior To Separation

+ References

No definition available.

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- Definition

Net Transfer Of Assets And Liabilities With Parent Company

+ References

No definition available.

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- Definition

Net Transfers From To Parent

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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X

- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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