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Stock-Based Compensation - Summary of Stock Options (Parenthetical) (Detail) (Stock Options [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average remaining contractual term of stock options outstanding 7 years 4 months 24 days
Aggregate intrinsic value of stock options outstanding based on the market value of company's common stock $ 86
Weighted average remaining contractual term of stock options exercisable 6 years 4 months 24 days
Aggregate intrinsic value of stock options exercisable based on the market value of company's common stock $ 37
Minimum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options exercise price $ 29.24
Maximum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options exercise price $ 37.59