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Stock-Based Employee Compensation Plans - Additional Information With Respect to Stock Options (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares Outstanding, January 1, 2013 520,575
Number of Shares, Granted 71,903
Number of Shares, Exercised (317,256)
Number of Shares, Forfeited (23,535)
Number of Shares Outstanding, December 31, 2013 251,687
Number of Shares Exercisable, December 31, 2013 127,475
Weighted Average Exercise Price on Number of Shares Outstanding, January 1, 2013 $ 40.24
Weighted Average Exercise Price on Number of Shares, Granted $ 83.89
Weighted Average Exercise Price on Number of Shares, Exercised $ 32.48
Weighted Average Exercise Price on Number of Shares, Forfeited $ 39.94
Weighted Average Exercise Price on Number of Shares Outstanding, December 31, 2013 $ 62.52
Weighted Average Exercise Price on Number of Shares Exercisable, December 31, 2013 $ 48.93
Weighted Average Remaining Contractual Term (in years) on Number of Shares Outstanding 6 years 7 months 6 days
Weighted Average Remaining Contractual Term (in years) on Number of Shares Exercisable, December 31, 2013 4 years 8 months 12 days
Aggregate Intrinsic Value on Number of Shares Outstanding, December 31, 2013 $ 9
Aggregate Intrinsic Value on Number of Shares Exercisable, December 31, 2013 $ 6