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Leases - Supplemental Balance Sheet Information (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Assets And Liabilities Lessee [Abstract]  
Operating lease, right-of-use assets $ 63
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsMember
Finance lease, right-of-use assets $ 7
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentMember
Total ROU assets $ 70
Current operating lease liability $ 22
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesMember
Current finance lease liability $ 3
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 $ 5
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherNoncurrentLiabilitiesMember
Total lease liabilities $ 70