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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Parenthetical) (Detail) - Buildings and Land [Member] $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Property Plant And Equipment [Line Items]
Net carrying value of properties held for sale	$ 2
Assets held for sale expected sale period	1 year

X

- Definition

Asset held for sale.

+ References

No definition available.

+ Details

Name:	dnow_AssetHeldForSale
Namespace Prefix:	dnow_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Assets held for sale expected sale period.

+ References

No definition available.

+ Details

Name:	dnow_AssetsHeldForSaleExpectedSalePeriod
Namespace Prefix:	dnow_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandAndBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: