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Leases - Supplemental Balance Sheet Information (Detail)
$ in Millions
Jun. 30, 2019
USD ($)
Assets And Liabilities Lessee [Abstract]  
Operating lease, right-of-use assets $ 64
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsMember
Finance lease, right-of-use assets $ 11
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentMember
Total ROU assets $ 75
Current operating lease liability $ 23
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesMember
Current finance lease liability $ 4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherCurrentLiabilitiesMember
Long-term operating lease liabilities $ 40
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] dnow:LongTermOperatingLeaseLiabilitiesMember
Long-term finance lease liability $ 8
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherNoncurrentLiabilitiesMember
Total lease liabilities $ 75