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Quarterly Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 761 us-gaap_Revenues | $ 667 us-gaap_Revenues | $ 676 us-gaap_Revenues | $ 628 us-gaap_Revenues | $ 769 us-gaap_Revenues | $ 666 us-gaap_Revenues | $ 670 us-gaap_Revenues | $ 587 us-gaap_Revenues | $ 2,732 us-gaap_Revenues | $ 2,692 us-gaap_Revenues | $ 2,665 us-gaap_Revenues
Gross margin | 425 us-gaap_GrossProfit | 350 us-gaap_GrossProfit | 371 us-gaap_GrossProfit | 333 us-gaap_GrossProfit | 431 us-gaap_GrossProfit | 358 us-gaap_GrossProfit | 379 us-gaap_GrossProfit | 305 us-gaap_GrossProfit | 1,479 us-gaap_GrossProfit | 1,473 us-gaap_GrossProfit | 1,491 us-gaap_GrossProfit
Operating income | 158 us-gaap_OperatingIncomeLoss | 123 us-gaap_OperatingIncomeLoss | 133 us-gaap_OperatingIncomeLoss | 89 us-gaap_OperatingIncomeLoss | 177 us-gaap_OperatingIncomeLoss | 132 us-gaap_OperatingIncomeLoss | 147 us-gaap_OperatingIncomeLoss | 76 us-gaap_OperatingIncomeLoss | 503 us-gaap_OperatingIncomeLoss | 532 us-gaap_OperatingIncomeLoss | 580 us-gaap_OperatingIncomeLoss
Net income | $ 118 us-gaap_NetIncomeLoss | $ 94 us-gaap_NetIncomeLoss | $ 96 us-gaap_NetIncomeLoss | $ 59 us-gaap_NetIncomeLoss | $ 112 us-gaap_NetIncomeLoss | $ 98 us-gaap_NetIncomeLoss | $ 108 us-gaap_NetIncomeLoss | $ 59 us-gaap_NetIncomeLoss | $ 367 us-gaap_NetIncomeLoss | $ 377 us-gaap_NetIncomeLoss | $ 419 us-gaap_NetIncomeLoss
Net income per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in usd per share) | $ 0.78 us-gaap_EarningsPerShareBasic | $ 0.61 us-gaap_EarningsPerShareBasic | $ 0.61 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.60 us-gaap_EarningsPerShareBasic | $ 0.66 us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 2.36 us-gaap_EarningsPerShareBasic | $ 2.31 us-gaap_EarningsPerShareBasic | $ 2.49 us-gaap_EarningsPerShareBasic
Diluted (in usd per share) | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 0.60 us-gaap_EarningsPerShareDiluted | $ 0.60 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.68 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 2.33 us-gaap_EarningsPerShareDiluted | $ 2.27 us-gaap_EarningsPerShareDiluted | $ 2.44 us-gaap_EarningsPerShareDiluted

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