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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	$ 761us-gaap_Revenues	$ 667us-gaap_Revenues	$ 676us-gaap_Revenues	$ 628us-gaap_Revenues	$ 769us-gaap_Revenues	$ 666us-gaap_Revenues	$ 670us-gaap_Revenues	$ 587us-gaap_Revenues	$ 2,732us-gaap_Revenues	$ 2,692us-gaap_Revenues	$ 2,665us-gaap_Revenues
Gross margin	425us-gaap_GrossProfit	350us-gaap_GrossProfit	371us-gaap_GrossProfit	333us-gaap_GrossProfit	431us-gaap_GrossProfit	358us-gaap_GrossProfit	379us-gaap_GrossProfit	305us-gaap_GrossProfit	1,479us-gaap_GrossProfit	1,473us-gaap_GrossProfit	1,491us-gaap_GrossProfit
Operating income	158us-gaap_OperatingIncomeLoss	123us-gaap_OperatingIncomeLoss	133us-gaap_OperatingIncomeLoss	89us-gaap_OperatingIncomeLoss	177us-gaap_OperatingIncomeLoss	132us-gaap_OperatingIncomeLoss	147us-gaap_OperatingIncomeLoss	76us-gaap_OperatingIncomeLoss	503us-gaap_OperatingIncomeLoss	532us-gaap_OperatingIncomeLoss	580us-gaap_OperatingIncomeLoss
Net income	$ 118us-gaap_NetIncomeLoss	$ 94us-gaap_NetIncomeLoss	$ 96us-gaap_NetIncomeLoss	$ 59us-gaap_NetIncomeLoss	$ 112us-gaap_NetIncomeLoss	$ 98us-gaap_NetIncomeLoss	$ 108us-gaap_NetIncomeLoss	$ 59us-gaap_NetIncomeLoss	$ 367us-gaap_NetIncomeLoss	$ 377us-gaap_NetIncomeLoss	$ 419us-gaap_NetIncomeLoss
Net income per share:
Basic (in usd per share)	$ 0.78us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 2.36us-gaap_EarningsPerShareBasic	$ 2.31us-gaap_EarningsPerShareBasic	$ 2.49us-gaap_EarningsPerShareBasic
Diluted (in usd per share)	$ 0.77us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 2.33us-gaap_EarningsPerShareDiluted	$ 2.27us-gaap_EarningsPerShareDiluted	$ 2.44us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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