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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class                      
Net income available for common stockholders $ 112 $ 98 $ 108 $ 59 $ 112 $ 104 $ 112 $ 91 $ 377 $ 419 $ 353
Weighted average outstanding shares of common stock                 163.4 168.2 168.1
Dilutive effect of employee stock options and restricted stock                 3.0 3.5 3.8
Common stock and common stock equivalents                 166.4 171.7 171.9
Basic $ 0.69 $ 0.60 $ 0.66 $ 0.36 $ 0.67 $ 0.62 $ 0.66 $ 0.54 $ 2.31 $ 2.49 $ 2.10
Diluted $ 0.68 $ 0.59 $ 0.65 $ 0.35 $ 0.66 $ 0.60 $ 0.65 $ 0.53 $ 2.27 $ 2.44 $ 2.05