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

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