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Leases - Supplemental Balance Sheet Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets And Liabilities Lessee [Abstract] |  |
Operating lease, right-of-use assets | $ 41 | $ 56
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssetsMember | us-gaap:OtherAssetsMember
Finance lease, right-of-use assets | $ 10 | $ 16
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentMember | us-gaap:PropertyPlantAndEquipmentMember
Total ROU assets | $ 51 | $ 72
Current operating lease liability | $ 17 | $ 21
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccruedLiabilitiesMember | us-gaap:AccruedLiabilitiesMember
Current finance lease liability | $ 5 | $ 7
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherCurrentLiabilitiesMember | us-gaap:OtherCurrentLiabilitiesMember
Long-term operating lease liabilities | $ 25 | $ 34
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | dnow:LongTermOperatingLeaseLiabilitiesMember | dnow:LongTermOperatingLeaseLiabilitiesMember
Long-term finance lease liability | $ 6 | $ 10
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherRegulatoryAssetsLiabilitiesMember | us-gaap:OtherRegulatoryAssetsLiabilitiesMember
Total lease liabilities | $ 53 | $ 72

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- Definition Right of use assets. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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