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Organization and Basis of Presentation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021 Country GeographicMarket
Impact Of Cash Flow Classification Error [Abstract]
Number of geographical area covered | GeographicMarket	80
Number of countries distribution occur through vendors | Country	40

X

- Definition

Impact of cash flow classification error.

+ References

No definition available.

+ Details

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Namespace Prefix:	dnow_
Data Type:	xbrli:stringItemType
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X

- Definition

Number of geographic markets.

+ References

No definition available.

+ Details

Name:	dnow_NumberOfGeographicMarkets
Namespace Prefix:	dnow_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of vendor distributed countries.

+ References

No definition available.

+ Details

Name:	dnow_NumberOfVendorDistributedCountries
Namespace Prefix:	dnow_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration