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Description of Business, Basis of Presentation and Significant Accounting Policies Components of Basic and Diluted Earnings Per Share (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
Description of Business, Basis of Presentation and Significant Accounting Policies [Abstract]
Net income available for common stockholders	$ 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
Weighted average outstanding shares of common stock									155.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	163.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	168.2us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of employee stock options and restricted stock									2.5us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3.0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3.5us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Common stock and common stock equivalents									157.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	166.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	171.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings 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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