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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, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Shares Outstanding, January 1, 2014 251,687us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Shares, Granted 65,605us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Number of Shares, Exercised (54,932)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Number of Shares, Forfeited (6,949)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Number of Shares Outstanding, December 31, 2014 255,411us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Shares Exercisable, December 31, 2014 128,880us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted Average Exercise Price on Number of Shares Outstanding, January 1, 2014 $ 62.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price on Number of Shares, Granted $ 86.59us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price on Number of Shares, Exercised $ 59.08us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price on Number of Shares, Forfeited $ 82.83us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted Average Exercise Price on Number of Shares Outstanding, December 31, 2014 $ 68.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price on Number of Shares Exercisable, December 31, 2014 $ 55.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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, 2014 4 years 9 months 18 days
Aggregate Intrinsic Value on Number of Shares Outstanding, December 31, 2014 $ 9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value on Number of Shares Exercisable, December 31, 2014 $ 6us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1