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 |
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Dec. 31, 2013
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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]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Stock options exercise price | $ 29.24 |
Maximum [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
Stock options exercise price | $ 37.59 |