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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class        
Net income available for common stockholders $ 98 $ 104 $ 265 $ 307
Weighted average outstanding shares of common stock 163.2 168.8 164.0 168.4
Dilutive effect of employee stock options and restricted stock 3.2 3.6 3.1 3.7
Common stock and common stock equivalents 166.4 172.4 167.1 172.1
Earnings per share:        
Basic $ 0.60 $ 0.62 $ 1.62 $ 1.82
Diluted $ 0.59 $ 0.60 $ 1.59 $ 1.78