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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