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Inventories, Net - Summary of Inventories (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Finished goods	$ 988us-gaap_InventoryFinishedGoods	$ 881us-gaap_InventoryFinishedGoods	$ 1,047us-gaap_InventoryFinishedGoods
Less: inventory reserves	(39)us-gaap_InventoryValuationReserves	(31)us-gaap_InventoryValuationReserves	(32)us-gaap_InventoryValuationReserves
Total	949us-gaap_InventoryNet	850us-gaap_InventoryNet	1,015us-gaap_InventoryNet
Inventory reserves:
Inventory reserves, Beginning balance	31us-gaap_InventoryValuationReserves	32us-gaap_InventoryValuationReserves	22us-gaap_InventoryValuationReserves
Inventory reserves, Charged to costs and expenses	8dnow_InventoryReserveProvisionChargedToExpense	5dnow_InventoryReserveProvisionChargedToExpense	16dnow_InventoryReserveProvisionChargedToExpense
Inventory reserves, Write-offs		(6)us-gaap_InventoryWriteDown	(6)us-gaap_InventoryWriteDown
Inventory reserves, Ending balance	$ 39us-gaap_InventoryValuationReserves	$ 31us-gaap_InventoryValuationReserves	$ 32us-gaap_InventoryValuationReserves

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Inventory Reserve Provision Charged To Expense

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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