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Supplemental Financial Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventories
Finished goods	$ 25us-gaap_InventoryFinishedGoodsNetOfReserves	$ 21us-gaap_InventoryFinishedGoodsNetOfReserves
Service parts	17us-gaap_InventoryPartsAndComponentsNetOfReserves	17us-gaap_InventoryPartsAndComponentsNetOfReserves
Total inventories	42us-gaap_InventoryNet	38us-gaap_InventoryNet
Deferred revenue
Deferred revenue, current	492us-gaap_DeferredRevenueCurrent	370us-gaap_DeferredRevenueCurrent
Long-term deferred revenue	16us-gaap_DeferredRevenueNoncurrent	18us-gaap_DeferredRevenueNoncurrent
Total deferred revenue	$ 508us-gaap_DeferredRevenue	$ 388us-gaap_DeferredRevenue

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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