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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Allowances and operating liabilities $ 2us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances $ 12us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances $ 10us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Net operating loss carryforwards 1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Book over tax depreciation   2dnow_DeferredTaxAssetsExcessOfBookOverTaxDepreciation 1dnow_DeferredTaxAssetsExcessOfBookOverTaxDepreciation
Trade credit 4dnow_DeferredTaxAssetsTradeCredits 1dnow_DeferredTaxAssetsTradeCredits  
Bad debt reserve 3dnow_DeferredTaxAssetsBadDebts 2dnow_DeferredTaxAssetsBadDebts 1dnow_DeferredTaxAssetsBadDebts
Inventory reserve 9us-gaap_DeferredTaxAssetsInventory 11us-gaap_DeferredTaxAssetsInventory 12us-gaap_DeferredTaxAssetsInventory
Stock options 12us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other 3us-gaap_DeferredTaxAssetsOther 2us-gaap_DeferredTaxAssetsOther 1us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 34us-gaap_DeferredTaxAssetsGross 36us-gaap_DeferredTaxAssetsGross 29us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:      
Tax over book depreciation (2)dnow_DeferredTaxLiabilitiesTaxOverBookDepreciation (2)dnow_DeferredTaxLiabilitiesTaxOverBookDepreciation  
Intangible assets (18)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (14)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (9)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liabilities (20)us-gaap_DeferredIncomeTaxLiabilities (16)us-gaap_DeferredIncomeTaxLiabilities (9)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 14us-gaap_DeferredTaxAssetsLiabilitiesNet $ 20us-gaap_DeferredTaxAssetsLiabilitiesNet $ 20us-gaap_DeferredTaxAssetsLiabilitiesNet