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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income available for common stockholders $ 94 $ 98 $ 249 $ 265
Weighted average outstanding shares of common stock 154.5 163.2 156.6 164.0
Dilutive effect of employee stock options, restricted stock and other stock awards 2.6 3.2 2.5 3.1
Common stock and common stock equivalents 157.1 166.4 159.1 167.1
Basic $ 0.61 $ 0.60 $ 1.59 $ 1.62
Diluted $ 0.60 $ 0.59 $ 1.57 $ 1.59